490 results
Search Results
2. Facile synthesis of amorphous nickel iron borate grown on carbon paper as stable electrode materials for promoted electrocatalytic urea oxidation
- Author
-
Abdulaziz M. Alsalman, Abdullah M. Al-Mayouf, Mahmoud Hezam, Saba A. Aladeemy, Zeyad Almutairi, Prabhakarn Arunachalam, and Mabrook S. Amer
- Subjects
Tafel equation ,Materials science ,chemistry.chemical_element ,General Chemistry ,Catalysis ,Amorphous solid ,Nickel ,chemistry.chemical_compound ,chemistry ,X-ray photoelectron spectroscopy ,Transmission electron microscopy ,Urea ,Boron ,Nuclear chemistry - Abstract
The development of greatly stable and cost-effective electrocatalysts for urea electro-oxidation reactions (UERs) is urgent and challenging for promoting urea removal in the wastewater and advanced energy conversion devices. We demonstrated that nickel-iron borate (NiFe-B) electrocatalysts supported on carbon paper (CP) for UERs through a one-pot solvothermal method. NiFe-B electrocatalysts were obtained with numerous Ni/Fe molar ratios in the precursors, and the physicochemical features of the NiFe-B were examined by X-ray diffraction, scanning and transmission electron microscope, and X-ray photoelectron spectroscopy. The optimized NiFe-B/CP exhibited a low onset potential (Eonset = 0.287 V vs. SCE) with a Tafel slope of 27.9 mV/dec on CP, demonstrating much greater performance UERs. Furthermore, the NiFe-B/CP catalysts have shown a superior activity for the UERs in alkaline solution and exhibit more than two-fold enhancement in activity than Ni-B. Facile, cost-effective fabrication and highly efficient urea oxidation create the NiFe-B electrodes as attractive materials for UERs.
- Published
- 2022
3. Catalytic graphitization of boron on the fabrication of high-performance carbon papers for gas diffusion layers in PEMFCs
- Author
-
Chenying Song, Hailong Li, Li Chen, Tao Fang, and Jian Hu
- Subjects
inorganic chemicals ,Fabrication ,Materials science ,chemistry.chemical_element ,complex mixtures ,Catalysis ,stomatognathic system ,Gaseous diffusion ,Boron ,Dissolution ,QD1-999 ,Carbon paper ,Catalytic graphitization ,Precipitation (chemistry) ,Process Chemistry and Technology ,General Chemistry ,Resin-derived carbon ,carbohydrates (lipids) ,stomatognathic diseases ,Chemistry ,chemistry ,Chemical engineering ,Carbon ,Solid solution - Abstract
Boron was introduced into carbon papers (CPs) to catalyze their graphitization in this paper. The results showed the graphitization of CPs was moved from 2400 °C to 2100 °C. At 2100 °C, boron substituted carbon atoms in the hexagonal carbon lattices to form a solid solution, and the catalytic mechanism was dissolution and precipitation. CPs with excellent electrical conductivity and good permeability were prepared at lower temperature. Thus, the boron-doping method provides a new way to prepare high performance CPs at lower costs.
- Published
- 2021
4. Borate-Modified, Flame-Retardant Paper Packaging Materials for Archive Conservation
- Author
-
Yuhu Li, Jing Cao, Kaiyuan Li, Bingjie Mai, Xiaolian Chao, Ming Cao, Juanli Wang, and Jiaxin Li
- Subjects
Materials science ,Chemical engineering ,chemistry ,Materials Science (miscellaneous) ,chemistry.chemical_element ,Environmental Science (miscellaneous) ,Boron ,Fire retardant - Published
- 2022
5. Catalytic graphitization of boron on the fabrication of high-performance carbon papers for gas diffusion layers in PEMFCs.
- Author
-
Chen, Li, Fang, Tao, Song, Chenying, Li, Hailong, and Hu, Jian
- Subjects
- *
CARBON paper , *GRAPHITIZATION , *DIFFUSION , *BORON , *ELECTRIC conductivity , *SOLID solutions , *LOW temperatures - Abstract
Boron was introduced into carbon papers (CPs) to catalyze their graphitization in this paper. The results showed the graphitization of CPs was moved from 2400 °C to 2100 °C. At 2100 °C, boron substituted carbon atoms in the hexagonal carbon lattices to form a solid solution, and the catalytic mechanism was dissolution and precipitation. CPs with excellent electrical conductivity and good permeability were prepared at lower temperature. Thus, the boron-doping method provides a new way to prepare high performance CPs at lower costs. [Display omitted] • The graphitization degree of 88.1% for CPs is reached at 2100 °C by boron-doping, whereas the value for the undoped CPs 2100 °C is only 34.3%; • The highly conductive CPs are achieved at lower graphitization temperatures without scarifying their gas permeability. • The graphitization temperature of CPs can be lowered as much as 300 °C. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
6. Boron Compounds-Added Kraft Pulping from Scots Pine; [Kraft celuloza od borovine s dodatkom spojeva bora]
- Author
-
Kuştaş, Süleyman and Gülsoy, Sezgin Koray
- Subjects
Additives ,Boron Compounds ,Kraft Pulping ,Paper Properties ,Pinus Sylvestris ,Pulp Properties ,Sodium Borohydride ,Yield ,Paper properties ,Pinus sylvestris ,Pinus sylvestris (L.) ,Pinus sylvestris L ,Pulp and paper ,Pulp properties ,Pulp strength ,Pulp yields ,Scots pine ,Total yield ,additive ,boron ,colemanite ,pine ,pulp and paper industry ,wood ,Kraft pulp - Abstract
In this study, effects of KBH4 (PB), NaBH4 (SB), Etibor-48 (E48), Etidot-67 (E67), and colemanite (Col) on kraft pulp and paper properties of Scots pine (Pinus sylvestris L.) wood were evaluated. The control and boron compound-added kraft pulps were obtained under constant cooking conditions. The boron compounds were used as digester additives in different ratios (2 % and 4 %). The addition of boron compounds to kraft cooking liquor resulted in increases screened and total yield of pulps. The highest screened yield (52.05 %) and total yield (55.09 %) were obtained from PB-4 pulp. The lowest reject ratio (0.61 %) and kappa number (34.60) were determined from PB-2 pulp. Furthermore, the highest tensile properties of handsheets were obtained from E67-4 pulp. Also, E48-4 pulp had the highest burst index and tear index values. E48, E67, and Col are cheaper than PB and SB. From these boron compounds, pulps with relatively low pulp yield but stronger can be obtained. © 2023 by the author(s).
- Published
- 2023
7. Reclamation of boron from solid and liquid streams for fertilizer application.
- Author
-
Figueira M, Srivastava V, Reig M, Valderrama C, and Lassi U
- Subjects
- Agriculture, Boron analysis, Boron chemistry, Fertilizers analysis
- Abstract
Boron (B) is a crucial element for efficient plant growth and development; therefore, B-based fertilisers have been employed in agricultural applications. The need for B-based fertilisers for agricultural uses is continuously increasing as a result of the world's growing population. It is expected that the global market for B-based fertiliser will grow by around $6.3 billion by 2032; hence, demand for B sources will also increase. In addition to being used in fertiliser, B is also employed in the production of neodymium iron B (NdFeB) permanent magnets. The demand for NdFeB magnets is also continuously increasing. Hence, it is of the utmost importance to reclaim B from secondary resources due to the rising demand for B in a wide variety of applications. This review study addresses the recovery of B from various waste streams. The main focus is on the recovery of B from spent NdFeB magnets, borax sludge, and liquid streams such as brine water, seawater, sewage, industrial wastewater, and agricultural effluents. Different technologies for B recovery are discussed, such as sorption, solvent extraction, membrane processes, precipitation, and hydrometallurgical methods. Solvent extraction has been found to be a very effective approach for reclaiming B from spent NdFeB magnet waste and from liquid streams with high B concentration (>1-2 g/L). Further, the application of B-based fertiliser in agriculture application is reviewed. Challenges associated with B recovery from waste streams and future perspectives are also highlighted in this review., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
8. Efficient electrochemical advanced degradation of Red CL and Red WB dyes from the tanning industry using a boron-doped diamond anode.
- Author
-
Herrera-Chávez S, Pacheco-Álvarez M, Kadier A, Brillas E, and Peralta-Hernández JM
- Subjects
- Hydrogen Peroxide chemistry, Tanning, Electrochemical Techniques, Photolysis, Ultraviolet Rays, Waste Disposal, Fluid methods, Iron chemistry, Coloring Agents chemistry, Water Pollutants, Chemical chemistry, Boron chemistry, Azo Compounds chemistry, Oxidation-Reduction, Diamond chemistry, Electrodes
- Abstract
Electrochemical oxidation (EO), electro-Fenton (EF), and photoelectro-Fenton (PEF) with a BDD anode have been comparatively assessed to remediate solutions of Red CL and/or Red WB azo dyes from real raw water. For the EO process in 50 mM Na
2 SO4 at pH 3.0, the main oxidant was the heterogeneous• OH generated at the anode, whereas in EF and PEF, the cathodic production of H2 O2 and the addition of 0.50 mM Fe2+ catalyst additionally originated homogeneous• OH that enhanced the oxidation of organics. In PEF, the solution was illuminated with a 6 W UVA light. An almost total discoloration was always found operating with a 1:1 mixture of 200 mg L-1 of both dyes in 60 min, whose efficiency increased in the order of EO < EF < PEF. The HPLC analysis of the dye mixture treated by PEF disclosed that its degradation process agreed with its discoloration. A high 74% of COD was reduced due to the oxidative action of hydroxyl radicals and the photolysis of final Fe(III)-carboxylate species with UVA irradiation. The process was accompanied by an energy consumption of 0.76 kWh (g COD)-1 , a value similar to the energy consumed by the applied UVA light., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
9. Anti-tumor therapy through high ROS performance induced by Ag nanoenzyme from boron cluster with halloysite clay nanotubes.
- Author
-
Deng X, Xu X, Xia S, Wang Z, Li Y, Huang T, Wei Y, and Zhang H
- Subjects
- Animals, Mice, Humans, Cell Proliferation drug effects, Drug Screening Assays, Antitumor, Particle Size, Surface Properties, Cell Line, Tumor, Cell Survival drug effects, Hydroxyl Radical chemistry, Catalysis, Clay chemistry, Silver chemistry, Silver pharmacology, Nanotubes chemistry, Reactive Oxygen Species metabolism, Antineoplastic Agents pharmacology, Antineoplastic Agents chemistry, Boron chemistry, Boron pharmacology, Metal Nanoparticles chemistry
- Abstract
The conventional silver nanoparticles (Ag NPs) are characterized with high loading rate and stacking phenomenon, leading to shedding caused biotoxicity and low catalytic efficiency. This seriously hinders their application in biomedicine. Here, we modified the highly dispersible Ag NPs and Ag single-atoms (SAs) synthesis by combining the halloysite clay nanotubes (HNTs) and dodecahydro-dodecaborate (closo-[B
12 H12 ]2- ) to increase the biocompatible properties and decrease the loading rate. This novel Ag single-atom nanoenzyme alongside Ag NPs nanoenzyme avoid the elevated-temperature calcination while maintaining the exceptionally high-level efficiency of Ag utilization via the reducibility and coordination stabilization of closo-[B12 H12 ]2- and HNTs. With theoretical calculation and electron paramagnetic resonance, we confirmed that both Ag SAzymes and Ag NPs in HNT@B12 H12 @Ag nanoenzyme are capable decompose the H2 O2 into hydroxyl radical (·OH). For the application, we investigated the catalytic activity in the tumor cells and antitumor effects of HNT@B12 H12 @Ag nanoenzyme both in vitro and in vivo, and confirmed that it effectively suppressed melanoma growth through ·OH generation, with limited biotoxicity. This study provides a novel Ag nanoenzyme synthesis approach to increase the possibility of its clinical application., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
10. Enhanced boron removal via seed-induced crystal growth of barium perborate in sequential fluidized-bed crystallization.
- Author
-
Lin JY and Huang YH
- Subjects
- Borates chemistry, Chemical Precipitation, Water Pollutants, Chemical chemistry, Boron chemistry, Crystallization, Barium chemistry
- Abstract
Chemical oxo-precipitation (COP) is an enhanced precipitation method for boron removal with the conversion of boric acid to perborate anions. When using barium-based precipitant, the boron can be effectively precipitated as barium perborates (BaPBs). The phase transformation of BaPBs from amorphous (A-BaPB, Ba(B(OH)
3 OOH)2 ) to crystalline (C-BaPB, BaB2 (OO)2 (OH)4 ) form is crucial for effective boron removal. However, scaling up this phase transformation of BaPBs is hindered by poor diffusion. This study aims to promote the growth of C-BaPB through seed-induced crystal growth, eliminating the need for phase transformation. By examining the relationship between crystal growth rate and supersaturation, surface spiral growth was identified as the rate-limiting step of the growth of micron-sized seeds near pHpzc . To enable continuous crystal growth, granular seeds of C-BaPB were prepared and employed as the medium for fluidized-bed crystallization (FBC). The system reached steady state 3 hydraulic retention times, achieving 90% boron removal. The effect of surface loading, ionic strength, and dosages on steady-state crystal growth rate was studied, revealing a shift of the rate-limiting step in FBC to diffusion. Lastly, the system that constituted of two FBCs in-series for sequential crystallization of A-BaPB and C-BaPB was demonstrated. The integrated system provided 97.8% of boron removal from synthetic wastewater containing 500 mg-B/L, with 92.3% of boron crystallized on the granular seeds of BaPBs., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
11. Comprehensive risk assessment and interactions of fluoride and boron ions in the water-sediments interface: The Red Sea, Egypt.
- Author
-
El-Said GF, El Zokm GM, El-Sayed AAM, and Soliman NF
- Subjects
- Risk Assessment, Egypt, Humans, Indian Ocean, Ions, Adult, Boron analysis, Boron chemistry, Water Pollutants, Chemical analysis, Seawater chemistry, Fluorides analysis, Geologic Sediments chemistry, Environmental Monitoring
- Abstract
This study presents a baseline evaluation of the distribution, human and ecotoxicological risk, and the potential interactions of fluoride and boron in the water-sediment interface in 25 locations from incredible Red Sea tourist destinations. Results showed comparable levels of B and F in the water and sediments with previous literature. Significant positive correlation was found between B and F (r = 0.57; P<0.01). Based on the sediment/liquid partition coefficient (K
d ), F is more likely to be released from the sediment into seawater (logKd < 3) than B (3< logKd < 4). pH and alkalinity may affect water-sediment interactions of B and F, respectively, while SO4 2- and Cl- ions had no significant effect on adsorption ability of F and B. The majority of minerals had average saturation Index (SI) > 1 referring to the over saturation of seawater with these minerals and their inability to dissolve. The formation of CF, FAP, and CFAP may be related to the high correlation between Fw (r = 0.928, P< 0.01; r = 0.527, P< 0.01; r = 0.608, P< 0.01) and Bw (r = 0.38, P< 0.05; r = 0.38, P< 0.05; r = 0.397, P< 0.05). Total hazard quotient (THQ) for children and adults were <1, revealing no health risks from exposure to B and F through ingestion and skin contact while swimming. The risk characterization ratio; RCRmix(MEC/PNEC) showed high short-term risks to aquatic organisms. Further investigations might emphasis on emerging mitigation strategies to address these concerns., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
12. Preclinical and histological study of boron-containing compounds hydrogels on experimental model of periodontal disease
- Author
-
Melania Olimpia Cojocaru, Horia Octavian Manolea, Mihai Popescu, Ion Romulus Scorei, Daniel Alin Olimid, Ioana Mitruţ, Andrei Biţă, and George Dan Mogoşanu
- Subjects
Embryology ,Pathology ,medicine.medical_specialty ,experimental model ,periodontal disease ,Alveolar Bone Loss ,Inflammation ,Pathology and Forensic Medicine ,Periodontal disease ,Boron containing ,Calcium Fructoborate ,medicine ,Animals ,Rats, Wistar ,Boron ,Periodontitis ,Original Paper ,Experimental model ,business.industry ,Soft tissue ,Hydrogels ,Cell Biology ,General Medicine ,Models, Theoretical ,medicine.disease ,Oral tissue ,Rats ,inflammation ,Self-healing hydrogels ,ligature ,Boric Acid ,medicine.symptom ,business ,Developmental Biology - Abstract
Periodontitis is a disease that affects a wide group of people, and there has been an increased interest in the research of finding useful materials that help reduce inflammation and the further loss of tissue. In this study, we have tested a boron-containing compound (BCC) Calcium Fructoborate (CaFB) and Boric Acid (BA) hydrogels on the gingival level on Wistar rats. First, we have induced the periodontal disease at the lower incisors, we have applied the hydrogels and after a week, we have euthanized the rats. Next, the oral soft tissue reaction was clinically and then histologically investigated. Our study has shown good clinical response of the oral tissue, and we have noticed lower levels of inflammation on the experimental groups treated with the BCCs hydrogels. Despite the generally good response of the biological structures to the presence of BA and CaFB on periodontal level, more scientifically proved information is needed to obtain the desired biological responses in all clinical situations.
- Published
- 2021
13. Towards the enhancement of nuclear reactor safety: Physical phenomena involved in the measurement accuracy of boron concentration online monitoring systems.
- Author
-
Tabti, Nouhaila, Sari, Adrien, and Tromson, Dominique
- Subjects
NUCLEAR reactors ,BORON ,BORIC acid ,POWER distribution in nuclear reactors ,MONTE Carlo method - Abstract
In Pressurized Water Reactors (PWRs), boron10 (
10 B) is added to the primary fluid as boric acid to regulate criticality and power distribution within the core. Indeed,10 B possesses a significant neutron absorption cross-section of approximately 3845 barns for thermal neutron energy (around 25.3 meV). Thus, under certain circumstances, even a slight variation in boron concentration could lead to criticality issues. This paper addresses the problems regarding the accuracy and real-time measurement of Boron Concentration Online Monitoring Systems (BCOMS) in PWRs. First, the paper focuses on presenting BCOMS's key performance and qualification criteria to ensure a real-time, accurate response during normal operation, operational transients, and accidental events. Then, we evaluate the influence of different dimensioning parameters on the overall measuring performance through Monte Carlo simulations using the MCNP6.2 code. Finally, we investigate, combining theoretical knowledge and simulation results, the physical phenomena involved in the measurement accuracy of BCOMS. This analytical approach not only fosters a deeper comprehension of the underlying phenomena but also facilitates the identification of potential areas for improving measurement accuracy, thereby enhancing the safety of nuclear reactors. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
14. Effect of boron fertilization on productivity and sustainability of rice-wheat cropping system in Tarai region, North-West India.
- Author
-
Pachauri SP, Shukla AK, Srivastava PC, Behara SK, Butail NP, Thakur P, Thakur P, Anjali, Sharma M, Sharma PK, Sahu A, and Kumar P
- Subjects
- India, Soil chemistry, Oryza growth & development, Boron, Triticum growth & development, Fertilizers, Agriculture methods, Crops, Agricultural growth & development
- Abstract
Extensive global dependency on rice and wheat crops has necessitated the adoption of intensive cultivation practices, thereby compelling to closely monitor the potential yield-limiting factors, among which, boron (B) deficiency stands out to be a prime concern. The present study explores the effects of B fertilization strategies within the Rice-Wheat Cropping System (RWCS) in the Tarai region of North-West India. A comprehensive six-year field experiment was conducted (2013-2019) at G.B. Pant University of Agriculture and Technology, Uttarakhand, India. The experiment tested graded B doses (0.5, 1.0, 1.5, and 2.0 kg ha
-1 ) at varied frequencies (single, alternate, and annual) in a factorial design. The study revealed significant impacts of alternate B application at 1.5 kg ha-1 on crop yields and the Sustainable Yield Index (SYI). The System Rice Equivalent Yield (SREY) exhibited an increase of 6.7% with B supplementation over B-deprived plots, highlighting the pivotal role of B fertilizer in enhancing productivity within the RWCS. The economic optimum B dose was found to be 1.422 kg ha-1 using a linear plus plateau model, resulting in a calculated annual SREY of 9.73 t ha-1 when applied alternately to the cropping system. Continuous application and higher B rates demonstrated substantial increases in various B fractions, while the mobility factor remained within 10%, depicting safe ecological limits. The distribution of fractions in B-treated plots on average followed the order: residual B > organically-bound B > oxide bound B > specifically adsorbed B > readily soluble B. Similarities in the distribution patterns of B fractions between B-treated plots and the control indicated potential influence of biotic or abiotic processes on B fraction dynamics, even in the absence of external B application. To sum up, B application in alternate years at 1.5 kg ha-1 was most sustainable in enhancing the SREY, SYI, available soil B, and B fractions and lowering the environmental hazards., Competing Interests: Declaration of competing interest The author(s) declared no potential conflict of interest that could have appeared to influence the work reported in the present paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
15. Quantum chemical framework for tailoring N/B doped phenalene derivatives to achieve high performance nonlinear optical materials.
- Author
-
urRehman S, Fatima S, Muhammad S, Bibi S, Munawar KS, Al-Sehemi AG, Chaudhry AR, and Adnan M
- Subjects
- Anisotropy, Electronics, Nitrogen, Boron, Phenalenes
- Abstract
Nonlinear optical (NLO) response materials are among the smartest materials of the era and are employed to modulate the phase and frequency of the laser. The present study presents a quantum chemical framework for tailoring nitrogen/boron doped derivatives of Dihydrodibenzo [de,op]pentacene through terminal and central core modifications. The derivatives of these compounds have been designed by introducing various π-conjugated connectors as well as B/N heteroatoms in the phenalene rings. Density functional theory (DFT) methods are used to optimize the ground state molecular geometries of designed compounds, represented as 1 to 4 (phenalene derivatives) and 1-BN to 4-BN (B/N doped phenalene derivatives) at the M06-2X/6-311G* level of theory. The highest value of 116.9 × 10
-24 esu and 240.2 × 10-24 esu for isotropic and anisotropic linear polarizability is shown by compound 4. Among the designed compounds, 4-BN has achieved the highest γ amplitude of 1858 × 10-36 esu owing to its unique molecular structural design. Further analysis of electronic parameters, such as electron density difference (EDD) maps, the density of states, electrostatic potentials, transition density matrix (TDM) analysis, and frontier molecular orbitals analysis (FMOs), demonstrated the more effective intramolecular charge transfer (ICT) for the best compounds, resulting in a good NLO response. The compounds were also analyzed for their potential in photovoltaic applications based on factors such as open circuit voltage values determined to be between (0.14 eV and 1.82 eV), and light harvesting efficiency (0.425-0.909)., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
16. Tunability of electronic and thermoelectric properties of hexagonal boron nitride with carbon impurities under magnetic field: Tight binding investigation.
- Author
-
Behzad S and Chegel R
- Subjects
- Carbon, Electronics, Nitrogen, Boron, Magnetic Fields, Boron Compounds
- Abstract
Utilizing the Kubo-Greenwood formula, Tight Binding calculations were employed to examine the electronic and thermoelectric properties of hexagonal boron nitride (h-BN) with carbon impurity instead of boron, nitrogen and pairs boron-nitrogen. The electronic properties of the pristine monolayer BN are markedly impacted by the introduction of carbon dopants and its band gap reduction is directly correlated with the concentration of carbon impurities. The electronic properties of doped h-BN are influenced by the presence of a magnetic field, leading to subband separation and band gap narrowing, independent of the impurity types. The thermal conductivity and magnetic susceptibility of the C
BN -doped monolayer BN structure are higher than those of the BC and NC doped h-BN structures and for all structures, their properties have a strong dependence on the magnetic field. The Lorenz Number for all structures has peak at the TM temperature which shifts to a lower temperature as the impurity concentration decreases., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Inc. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
17. Assessment of Selected Surface and Electrochemical Properties of Boron and Strontium-Substituted Hydroxyapatites.
- Author
-
Kolmas J, Samoilov P, Jaguszewska A, and Skwarek E
- Subjects
- Humans, Tissue Scaffolds chemistry, Durapatite, Biocompatible Materials chemistry, Strontium chemistry, Surface Properties, Boron, Hydroxyapatites chemistry
- Abstract
Tissue engineering is an interdisciplinary field of science that has been developing very intensively over the last dozen or so years. New ways of treating damaged tissues and organs are constantly being sought. A variety of porous structures are currently being investigated to support cell adhesion, differentiation, and proliferation. The selection of an appropriate biomaterial on which a patient's new tissue will develop is one of the key issues when designing a modern tissue scaffold and the associated treatment process. Among the numerous groups of biomaterials used to produce three-dimensional structures, hydroxyapatite (HA) deserves special attention. The aim of this paper was to discuss changes in the double electrical layer in hydroxyapatite with an incorporated boron and strontium/electrolyte solution interface. The adsorbents were prepared via dry and wet precipitation and low-temperature nitrogen adsorption and desorption methods. The specific surface area was characterized, and the surface charge density and zeta potential were discussed.
- Published
- 2024
- Full Text
- View/download PDF
18. Increasing the physical and combustion performance of Oriental beech by impregnating borates and coating liquid glass
- Author
-
Yilmaz Anil Gunbekler, Hilmi Toker, Caglar Altay, Mustafa Kucuktuvek, and Ergun Baysal
- Subjects
Lightness ,Absorption of water ,Materials science ,chemistry.chemical_element ,Weathering ,TP1-1185 ,engineering.material ,Combustion ,physical properties ,Coating ,Chemical Engineering (miscellaneous) ,Boron ,Beech ,biology ,Chemical technology ,combustion properties ,Organic Chemistry ,liquid glass ,Oriental beech wood ,biology.organism_classification ,Pulp and paper industry ,borates ,chemistry ,Color changes ,engineering - Abstract
This study was designed to investigate physical properties such as color changes after weathering and water absorption (WA) levels, and combustion performance of borates-impregnated and LG-coated Oriental beech wood. Results showed that borates impregnated and LG-coated Oriental beech wood showed positive lightness stability after weathering. The best color stabilization was obtained with LG-coated Oriental beech. Except for the 1 h WA period, LG did not show a water repellent effect after the water absorption test. Borates impregnation before LG-coating caused to decrease in weight loss of Oriental beech after the combustion test. Moreover, the lowest weight losses were obtained in borate impregnated Oriental beech wood.
- Published
- 2021
19. Properties of Ni-B/B Composite Coatings Produced by the Electroless Method under Semi-Technical Line Conditions.
- Author
-
Cieślak, Grzegorz, Gostomska, Marta, Dąbrowski, Adrian, Ciciszwili-Wyspiańska, Tinatin, Skroban, Katarzyna, Mazurek, Anna, Wojda, Edyta, Głowacki, Michał, Rygier, Tomasz, and Gajewska-Midziałek, Anna
- Subjects
COMPOSITE coating ,CHEMICAL reduction ,HEAT treatment ,SURFACE coatings ,ELECTROPLATING ,DISPERSION (Chemistry) - Abstract
Composite coatings have been successfully fabricated at the laboratory scale in many research centers around the world; however, it is still a major challenge to transfer the positive results of the work to the industrial scale. This paper presents the technology for the production of Ni-B and Ni-B/B composite coatings on a pilot experimental semi-technical line by chemical reduction. A process scheme for the fabrication of Ni-B layers and composite coatings with a nickel–boron matrix and a dispersive phase in the form of boron nanoparticles was developed. All stages of the fabrication process were described in detail. The dispersion phase of the boron particles was characterized, and the performance properties of the Ni-B and Ni-B/B composite coatings produced on a pilot electroplating line were studied. The structure and morphology of the Ni-B/B composite coatings were characterized for comparison with nickel–boron coatings. Their mechanical and tribological properties and adhesion to the substrate were studied. The influence of the dispersion phase of boron particles on the structure and functional properties of the composite coatings was evaluated. In order to improve the performance of the fabricated coatings, a heating process at 400 °C was carried out, and the performance of Ni-B and composite Ni-B/B coatings was studied after the heat treatment operation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
20. Accurate Boron Determination in Tourmaline by Inductively Coupled Plasma Mass Spectrometry: An Insight into the Boron–Mannitol Complex-Based Wet Acid Digestion Method.
- Author
-
Tan, Xijuan, Feng, Yonggang, Zhou, Ruili, Wang, Denghong, Liang, Ting, and Wang, Yan
- Subjects
INDUCTIVELY coupled plasma mass spectrometry ,TOURMALINE ,BORON - Abstract
Tourmaline, a boron-bearing mineral, has been extensively applied as a geothermometer, provenance indicator, and fluid-composition recorder in geological studies. In this paper, the decomposition capability of an HF-HNO
3 –mannitol mixture for a tourmaline sample was investigated in detail for the first time, and a wet acid digestion method based on the boron–mannitol complex for accurate boron determination in tourmaline by inductively coupled plasma mass spectrometry (ICP-MS) was proposed. With a digestion temperature of 140 °C, tourmaline samples of 25 mg (±0.5 mg) can be completely decomposed by a ternary mixture, which consisted of 0.6 mL of HF, 0.6 mL of HNO3 , and 0.7 mL of 2% mannitol (wt.), via a continuous heating treatment of 36 h. Following gentle evaporation at 100 °C, the sample residues were re-dissolved using 2 mL of 40% HNO3 solution (wt.) and diluted to about 2.0 × 105 -fold by a two-step method using 2% HNO3 solution (wt.). The boron contents in a batch of parallel tourmaline samples were then determined by ICP-MS, and results showed that the boron concentration levels were in a range of 3.20–3.44% with determination RSDs less than 4.0% (n = 5). It was found that the boron concentrations obtained at the mass of10 B were comparable with results from the measurements at the mass of11 B. This revealed that the usage of 2% mannitol with a quantity as high as 0.7 mL in this developed approach did not exhibit significant effect on the quantification accuracy of boron at the mass of11 B. It was also found that the processes including fluoride-forming prevention and fluoride decomposition deteriorated the boron-reserving efficiency of mannitol for tourmaline, causing the averaged boron contents to vary from 2.25% to 3.57% (n = 5). Furthermore, the stability of the boron–mannitol complex under 185 °C by applying the laboratory high pressure-closed digestion method was evaluated, which showed that there existed a 60.36% loss of boron compared to that under 140 °C by using this proposed approach. For this ternary mixture, the tourmaline decomposing efficiency was found to be weakened prominently using 100 °C as the digestion temperature, and tourmaline powders can be observed even after 72 h of continuous heating with B contents within 1.09–1.23% (n = 5). To assess the accuracy of this developed method, the boron recovery of anhydrous lithium tetraborate was studied. It was found that the boron recoveries were within 96.59–102.12% (RSD < 1%, n = 5), demonstrating the accuracy and reliability of this proposed method, which exhibits advantages of high B preserving efficiency, and giving concentration information of both B and trace elements simultaneously. By applying such a boron–mannitol complex-based wet acid digestion method, the chemical composition of boron and trace elements in three tourmaline samples from different pegmatites were quantified, which provided valuable information to distinguish regional deposits and the associated evolution stages. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
21. 环保型钆硼柔性热中子吸收材料特性研究.
- Author
-
王 琦, 郭晓林, 尹进南, 王晓娟, 原 林, 王博宇, 方青龙, 韩小祥, 仇天祎, and 刘 洋
- Abstract
Copyright of Atomic Energy Science & Technology is the property of Editorial Board of Atomic Energy Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
22. Comparative Study of Numerical Schemes for Granular Combustion of Boron Potassium Nitrate.
- Author
-
Elizabeth, Annie Rose, Sarma, Sumit, Jayachandran, T., Ramakrishna, P. A., and Borthakur, Mondeep
- Subjects
POTASSIUM nitrate ,COMBUSTION ,INCENDIARY bombs ,BORON ,COMPARATIVE studies ,GRANULAR materials - Abstract
Multiple applications in aerospace utilize pyrotechnic charges for their operation, and these charges are predominantly in the form of granules. One of the most used charges is boron potassium nitrate (BPN), and the present study focuses on mathematically modeling granular combustion, its experimental recreation, and carrying out a comparative study on three upwind schemes for its numerical simulation. A customized version of the seven-equation compressible multifluid formulation is presented in this paper to model granular combustion mathematically. Three upwind schemes, namely HLLC, AUSM
+ -up, and HLLC-AUSM, are used for the numerical comparison. Utilizing these, an axisymmetric code is developed for the comparative study. To experimentally replicate granular combustion, granular BPN is fired in a closed bomb test facility, and the experimental pressure history is used for the numerical comparisons. The developed code can adequately predict the physics of granular combustion, and all three schemes are equally capable of numerical prediction. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
23. Nitrate Sensor with a Wide Detection Range and High Stability Based on a Cu-Modified Boron-Doped Diamond Electrode.
- Author
-
Wei, Shengnan, Xiao, Danlin, Li, Yang, and Bian, Chao
- Subjects
DOPING agents (Chemistry) ,ELECTROCHEMICAL sensors ,WATER pollution monitoring ,ELECTRODES ,DETECTORS ,BORON - Abstract
This paper describes an electrochemical sensor based on a Cu-modified boron-doped diamond (BDD) electrode for the detection of nitrate-contaminated water. The sensor utilizes the catalytic effect of copper on nitrate and the stability of the BDD electrode. By optimizing the electrolyte system, the linear detection range was expanded, allowing the sensor to detect highly concentrated nitrate samples up to 100 mg/L with a low detection limit of 0.065 mg/L. Additionally, the stability of the sensor was improved. The relative standard deviation of the current responses during 25 consecutive tests was only 1.03%. The wide detection range and high stability of the sensor makes it suitable for field applications and the on-site monitoring of nitrate-contaminated waters. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
24. Eucalyptus wood treatment and leaching behavior of CCB (Chromated Copper Borate): a field test in Brazilian Midwest
- Author
-
Pedro Augusto Fonseca Lima, Cassiano Pacheco da Silva, Ana Larissa Santiago Hansted, Gabriela Bertoni Belini, Elias Ricardo Durango Padilla, Carlos Roberto Sette Junior, Fábio Minoru Yamaji, and Fernando Nunes Gouveia
- Subjects
Preservative ,Field exposure ,Wood preservation ,Preservación de la madera ,Field experiment ,Deterioro de la madera ,chemistry.chemical_element ,Propriedades da madeira ,Propiedades de la madera ,Pulp and paper industry ,Eucalyptus ,Copper ,Chromium ,chemistry ,Preservação da madeira ,General Earth and Planetary Sciences ,Deterioração da madeira ,Wood properties ,Leaching (agriculture) ,Boron ,Wood deterioration ,General Environmental Science - Abstract
The use of Chromated Copper Borate (CCB) for wood treatment is known with several studies on a laboratory scale. However, there is a lack of field studies to analyze the effect of the CCB over time. This study aimed to evaluate the wood properties of Eucalyptus urophylla S.T. Blake x Eucalyptus grandis W. Mill ex Maiden (called E. urograndis), treated with CCB as well evaluate the leaching of chromium, copper and bore (Cr/Cu/B) in field test. The field experiment, with wood treated and untreated (no CCB application), was installed in 2016 and remained until 2018. Wood physico-mechanical properties were evaluated for each condition (treated and untreated) and at three different time: at 0, 1 and 2 years of field exposure. The elements (Cr/Cu/B) losses (leaching) were determined by the difference in the quantification of each element retained in the wood (retention), from year 0 (amount of original elements) in relation to years 1 and 2 of field exposure. The preservative treatment of E. urograndis wood with CCB was efficient to maintain its physical and mechanical properties (mass loss, basic density, rupture and elasticity modulus) during the 2 years of field exposure. The E. urograndis wood without CCB treatment showed reductions in the physical-mechanical properties, indicating their low natural durability. High leaching (close to 100%) for boron was observed. In addition, the total of CCB retention has not changed (statistically) after 2 years. El uso de Borato de Cobre Cromatado (CCB) para el tratamiento de la madera se conoce a través de varios estudios a escala de laboratorio. Sin embargo, faltan estudios de campo para analizar el efecto de CCB a lo largo del tiempo. Este estudio tuvo como objetivo evaluar las propiedades de la madera de Eucalyptus urophylla S.T. Blake x Eucalyptus grandis W. Mill ex Maiden (denominada E. urograndis), tratada con CCB, además de analizar la lixiviación de cromo, cobre y boro (Cr/Cu/B) en pruebas de campo. El experimento de campo, con madera tratada y sin tratar, se instaló en 2016 y se mantuvo hasta 2018. Se evaluaron las propiedades físico-mecánicas de la madera para cada condición (tratada y sin tratar) y en tres momentos diferentes: 0, 1 y 2 años exposición de campo. Las pérdidas de elementos (Cr/Cu/B) (lixiviación) fueron determinadas por la diferencia en la cuantificación de cada elemento retenido en la madera (retención), desde el año 0 (número de elementos originales) en adelante en relación a los años 1 y 2. El tratamiento conservante de la madera de E. urograndis con CCB fue eficaz para preservar sus propiedades físicas y mecánicas (pérdida de masa, densidad básica, ruptura y módulo elástico) durante los 2 años de exposición en campo. La madera de E. urograndis sin tratamiento CCB mostró una reducción de las propiedades físico-mecánicas, lo que indica una baja durabilidad natural. Se observó una alta lixiviación (cercana al 100%) de boro. Además, la retención total de CCB no cambió (estadísticamente) después de 2 años. O uso do Borato de Cobre Cromatado (CCB) para o tratamento da madeira é conhecido através de diversos estudos em escala laboratorial. No entanto, faltam estudos de campo para analisar o efeito do CCB ao longo do tempo. Este estudo teve como objetivo avaliar as propriedades da madeira de Eucalyptus urophylla S.T. Blake x Eucalyptus grandis W. Mill ex Maiden (E. urograndis), tratado com CCB, bem como analisar a lixiviação de cromo, cobre e boro (Cr/Cu/B) em teste de campo. O experimento de campo, com as madeiras tratadas e não tratadas (sem aplicação de CCB), foi instalado em 2016 e permaneceu até 2018. As propriedades físico-mecânicas da madeira foram avaliadas para cada condição (tratada e não tratada) e em três momentos distintos: 0, 1 e 2 anos de exposição em campo. As perdas dos elementos (Cr/Cu/B) (lixiviação) foram determinadas pela diferença na quantificação de cada elemento retido na madeira (retenção), a partir do ano 0 (quantidade de elementos originais) em relação aos anos 1 e 2 de exposição em campo. O tratamento preservativo da madeira de E. urograndis com CCB foi eficiente para manter suas características físicas e mecânicas (perda de massa, densidade básica, ruptura e módulo de elasticidade) durante os 2 anos de exposição em campo. A madeira de E. urograndis sem tratamento CCB apresentou redução significativa nas propriedades físico-mecânicas, indicando a sua baixa durabilidade natural. Foi observada alta lixiviação (perto de 100%) para o boro. Além disso, a retenção total de CCB não mudou (estatisticamente) após 2 anos.
- Published
- 2021
25. Electrochemical oxidation of tetrahydrofurfuryl acohol on boron-doped diamond anode: Influence of current density and electrolyte solution.
- Author
-
Liu H, Hong X, Chen J, Lin X, Wang B, and Xiong Y
- Subjects
- Diamond chemistry, Sulfates chemistry, Electrodes, Boron chemistry, Water Pollutants, Chemical analysis
- Abstract
Tetrahydrofurfuryl alcohol (THFA), a widely applied raw materials, intermediate and solvent in the fields of agricultural, industry (especially in nuclear industry), is a potentially hazardous and non-biodegradable pollutant in wastewater. In this study, the electrochemical degradation pathways of THFA by a boron-doped diamond (BDD) anode with different current density (j
appl = 20, 40 and 60 mA cm-2 ) and electrolyte solution (KNO3 , KCl and K2 SO4 ) was carefully investigated. The results exhibit that high chemical oxygen demand (COD) removal and mineralization rates were achieved by rapid non-selective oxidation in electrolyte solutions mediated by hydroxyl radicals (∙OH) and active chlorine (sulfate) under constant current electrolysis. In-depth data analysis using the high performance liquid chromatography and liquid chromatography/mass spectroscopy, the underlying removal pathways of THFA in KNO3 , KCl and K2 SO4 electrolyte solutions are proposed according to the effect of different mineralization mechanisms., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)- Published
- 2023
- Full Text
- View/download PDF
26. Boron-based magnesium diboride nanosheets preparation and tested for antimicrobial properties for PES membrane.
- Author
-
Kucukosman R, Isik Z, Ocakoglu K, Dizge N, Özdemir S, Yalçın MS, Sharma P, and Balakrishnan D
- Subjects
- Escherichia coli, Staphylococcus aureus, Anti-Bacterial Agents pharmacology, Pseudomonas aeruginosa, Boron, Anti-Infective Agents pharmacology
- Abstract
Antimicrobial resistance to antibiotics for current bacterial infection treatments is a medical problem. 2D nanoparticles, which can be used as both antibiotic carriers and direct antibacterial agents due to their large surface areas and direct contact with the cell membrane, are important alternatives in solving this problem. This study focuses on the effects of a new generation borophene derivative obtained from MgB
2 particles on the antimicrobial activity of polyethersulfone membranes. MgB2 nanosheets were created by mechanically separating magnesium diboride (MgB2 ) particles into layers. The samples were microstructurally characterized using SEM, HR-TEM, and XRD methods. MgB2 nanosheets were screened for various biological activities such as antioxidant, DNA nuclease, antimicrobial, microbial cell viability inhibition, and antibiofilm activities. The antioxidant activity of nanosheets was 75.24 ± 4.15% at 200 mg/L. Plasmid DNA was entirely degraded at 125 and 250 mg/L nanosheet concentrations. MgB2 nanosheets exhibited a potential antimicrobial effect against tested strains. The cell viability inhibitory effect of the MgB2 nanosheets was 99.7 ± 5.78%, 99.89 ± 6.02%, and 100 ± 5.84% at 12.5 mg/L, 25 mg/L, and 50 mg/L, respectively. The antibiofilm activity of MgB2 nanosheets against S. aureus and P. aeruginosa was observed to be satisfactory. Furthermore, a polyethersulfone (PES) membrane was prepared by blending MgB2 nanosheets from 0.5 wt to 2.0 wt %. Pristine PES membrane also has shown the lowest steady-state fluxes at 30.1 ± 2.1 and 56.6 L/m2 h for BSA and E. coli, respectively. With the increase of MgB2 nanosheets amount from 0.5 to 2.0 wt%, steady-state fluxes increased from 32.3 ± 2.5 to 42.0 ± 1.0 and from 15.6 ± 0.7 to 24.1 ± 0.8 L/m2 h, respectively for BSA and E. coli. E. coli elimination performance of PES membrane coated with MgB2 nanosheets at different rates and the membrane filtration procedure was obtained from 96% to 100%. The results depicted that BSA and E. coli rejection efficiencies of MgB2 nanosheets blended PES membranes increased when compared to pristine PES membranes., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)- Published
- 2023
- Full Text
- View/download PDF
27. Electro-enhanced metal-free peroxymonosulfate activator coupled with membrane-assisted process for simultaneous Ni-EDTA decomplexation and Ni ions recovery.
- Author
-
Zhang J, Yu C, Xu L, Zhao Z, and Wu D
- Subjects
- Edetic Acid chemistry, Oxidation-Reduction, Boron, Peroxides chemistry
- Abstract
Electro-enhanced metal-free boron/peroxymonosulfate (B/PMS) system has demonstrated potential for efficient metal-organic complexes degradation in an eco-friendly way. However, the efficiency and durability of the boron activator are limited by associated passivation effect. Additionally, the lack of suitable methods utilizing in-situ recovery of metal ions liberated from decomplexation causes huge resource waste. In this study, B/PMS coupled with a customized flow electrolysis membrane (FEM) system is proposed to address above challenges with Ni-EDTA used as the model contaminant. Electrolysis is confirmed to remarkably promote the activation performance of boron towards PMS to efficiently generate
• OH which dominated Ni-EDTA decomplexation in the anode chamber. It is revealed that the acidification near the anode electrode improves the stability of boron by inhibiting passivation layer growth. Under optimal parameters (10 mM PMS, 0.5 g/L boron, initial pH = 2.3, current density = 68.87 A/m2 ), 91.8% of Ni-EDTA could be degraded in 40 min, with a kobs of 6.25 × 10-2 min-1 . As the decomplexation proceeds, nickel ions are recovered in the cathode chamber with little interference from the concentration of co-existing cations. These findings provide a promising and sustainable strategy for simultaneous metal-organic complexes removal and metal resources recovery., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023. Published by Elsevier Ltd.)- Published
- 2023
- Full Text
- View/download PDF
28. A critical review of plant adaptation to environmental boron stress: Uptake, utilization, and interplay with other abiotic and biotic factors.
- Author
-
Li S, Yan L, Venuste M, Xu F, Shi L, White PJ, Wang X, and Ding G
- Subjects
- Adaptation, Physiological, Soil chemistry, Acclimatization, Plant Roots, Stress, Physiological, Boron toxicity, Plants
- Abstract
Boron (B) is an indispensable mineral nutrient for plants and is primarily taken up by roots mainly in the form of boric acid (H
3 BO3 ). Recently, research shows that B has a significant impact on plant growth and productivity due to its narrow range between deficiency and toxicity. Fertilization and other procedures to address B stress (deficiency and toxicity) in soils are generally expensive and time-consuming. Over the past 20 years, substantial studies have been conducted to investigate the mechanisms underlying B acquisition and the molecular regulation of B stress in plants. In this review, we discuss the effects of B stress on plant growth, physiology, and biochemistry, and finding on enhancing plant tolerance from the perspective of plant B uptake, transport, and utilization. We also refer to recent results demonstrating the interactions among B and other biological and abiotic factors, including nitrogen, phosphorus, aluminum, and microorganisms. Finally, emerging trends in this field are discussed., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)- Published
- 2023
- Full Text
- View/download PDF
29. Integrated pressure-driven membrane separation processes for the production of agricultural irrigation water from spent geothermal water
- Author
-
Aslı Karaoğlu, Alper Baba, Özge Tekin, Yakubu A. Jarma, Nalan Kabay, and Islam Rashad Ahmed Senan
- Subjects
General Chemical Engineering ,chemistry.chemical_element ,Reverse-Osmosis Membrane ,Rejection ,Membrane technology ,Boron Removal ,Ro Membranes ,Sodium adsorption ratio ,Seawater ,General Materials Science ,Reverse osmosis ,Boron ,Water Science and Technology ,Behavior ,Flux ,Desalination ,Ph ,Chemistry ,Mechanical Engineering ,Membrane ,General Chemistry ,Irrigation water ,Permeation ,Pulp and paper industry ,Geothermal water ,Produced water ,Nanofiltration ,Industrial - Abstract
The application of different pressure-driven membranes to treat the spent geothermal water to be used for agricultural irrigation was explored in this study. Firstly, individual performances of different commercially available nanofiltration (NF) and reverse osmosis (RO) membranes attached to a mini-pilot membrane test system were studied. For the single membrane test TR-NF and NF90 as NF membranes and TR-BWRO, Vontrone, TR-SWRO and BW30 as RO membranes were employed while combination of TR-NF with TR-BWRO, Vontrone, TR-SWRO and BW30 was employed in the integrated study (with and without pH adjustment).When performances of individual membranes were investigated, the permeate fluxes obtained it was found that there was no significant flux drop with the experimental time (4 h) in all the studies. In terms of boron removals, boron was partially removed in single membrane study as 22.7-23.6% and 30.6-56.8% by NF and RO membranes, respectively. For the integrated NF + RO membrane configuration (without pH adjustment), boron removals were in the range of 42.1-59.4% while 91.3-95.4% of boron removal was obtained in the integrated NF + RO (at elevated pH). It was found that the produced water complied with class I quality with respect to irrigation water parameters with the exception of boron and sodium adsorption ratio (SAR), while the pH of the product water in the integrated NF + RO study at elevated pH was found to be in class III. Hence, produced water will be suitable (class II) for irrigation if 30% of well water should be blended with the product water in the integrated NF + RO studies (with and without pH adjustment) as well as pH adjustment when necessary., TUBITAK-NCBR [118Y490-POLTUR3/Geo4Food/4/2019]; TUBITAK, TUBITAK-NCBR (Project No: 118Y490-POLTUR3/Geo4Food/4/2019) provided financial support for this work. Also, the financial support and scholarships to the students working on this research given by TUB.ITAK are highly appreciated. The Presidency for Turks Abroad and Related Communities (YTB) are also highly acknowledged for PhD scholarship given to Y.A. Jarma. We would like to thank Izmir Geothermal Energy Co. in Izmir for allowing us to install our mini-pilot system in the geothermal heating center.; Toray Advanced Materials Korea Inc. provided us the TR-NE90-NF and TR-BE-BW membranes for our field tests. We are thankful especially to M. Kurihara and H. Ozgencil of Toray Co. We also appreciate K. Bostanci for his kind help with some of the analyses.
- Published
- 2022
30. First-principles study of the effects of doping B, N, and O on the photoelectric properties of Cr adsorbed GaS.
- Author
-
Yang, Xiaotong, Liu, Guili, He, Jianlin, Wei, Ran, Ma, Mengting, Xu, Jingze, Zhao, Bingcai, Ru, Yunfan, Yang, Zhonghua, and Zhang, Guoying
- Subjects
- *
THEORY of distributions (Functional analysis) , *GAS absorption & adsorption , *NUCLEAR forces (Physics) , *GEOMETRIC modeling , *ELECTRONIC structure , *BORON - Abstract
Context: To lessen the impact of the dangerous metal Cr, this paper applies the first principles to investigate the adsorption behavior and photoelectric properties of GaS on Cr. The effects of doped GaS on Cr adsorption behavior are investigated with four GaS systems, which are pure, boron (B)-doped, nitrogen (N)-doped, and oxygen (O)-doped, in order to maximize the characteristics of GaS for use in novel sectors, to obtain understanding of the impact of doping on the electronic structure and optical properties of GaS adsorption of Cr, as well as to promote the development of the material. Four GaS adsorbed Cr systems, pure, B-doped, N-doped, and O-doped, are optimized, and the optimized results show that the stable adsorption position of Cr on both pure and doped GaS is the top position of Ga atoms, whereas doped elements B, N, and O can promote the adsorption of Cr on GaS, and the order of the strength of this promotion is B > N > O. Method: In this paper, molecular simulation calculations and analyses using the CASTEP module in the software Materials Studio are performed to simulate the structure optimization of GaS-adsorbed Cr materials doped with B, N, and O atoms by using the generalized gradient approximation (GGA) plane-wave pseudopotential approach [1] and the Perdew-Burke-Ernzerhof (PBE) generalized function [2]. From the convergence test, it is reasonable to set the K-point network to 4 × 4 × 1 and the truncation energy to 500 eV [3]. In this paper, a 3 × 3 × 1 supercell structure with 18 S atoms and 18 Ga atoms is selected. The convergence value of the iterative accuracy is 1.0e − 5 eV/atom, and all the atomic forces are less than 0.02 eV/Å. A vacuum layer of 16 Å is also set in the C direction to avoid interlayer interactions of GaS. First, we optimize the geometry of the model and then analyze the nature of the adsorption energy and electronic structure corresponding to the model. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
31. First principle study of the effect of doping on the optoelectronic properties of Cr-adsorbed MoS2.
- Author
-
Wei, Ran, Liu, Guili, Su, Dan, Ma, Mengting, Mu, Yansong, Yang, Zhonghua, and Zhang, Guoying
- Subjects
- *
PSEUDOPOTENTIAL method , *MATERIALS science , *NUCLEAR forces (Physics) , *GEOMETRIC modeling , *ELECTRONIC structure , *SIMULATION software , *BORON , *NITROGEN - Abstract
Context: This study explores, for the first time, using first principles, the impact of substitutional doping with boron (B), carbon (C), and nitrogen (N) on the adsorption of chromium (Cr) on monolayer MoS2. The effects of doping on the Cr adsorption behavior of MoS2 were investigated using four MoS2 systems, namely, pure, boron (B)-doped, carbon (C)-doped, and nitrogen (N)-doped, in order to gain an in-depth understanding of the mechanism of the effects of doping on the electronic structure and optical properties of Cr adsorbed by MoS2, to optimize the properties of MoS2, to explore new areas of application, and to promote the development of materials science. Four MoS2 adsorption systems of Cr adsorption on pure, B-doped, C-doped, and N-doped MoS2 were optimized, and the optimized results showed that the stable adsorption location of Cr on both pure and doped MoS2 was the hollow location at the top of the folded hexagon. The findings reveal that pure MoS2 has an adsorption effect on Cr, and doped elements B, C, and N can promote the adsorption of Cr on MoS2, and the strong and weak order of this promotion is B > C > N. Methods: In this paper, we use the CASTEP module in the simulation software Materials Studio to perform simulation calculations and analyses to optimize the simulation of Cr adsorption by MoS2 doped with B, C, and N atoms using the generalized gradient approximation (GGA) plane-wave pseudo-potential method (Perdew et al. Phys Rev Lett 77(18):3865–3968, 1996), as well as Perdew-Burke-Ernzerhof (PBE) generalized functionals (Segall et al. J Phys: Condens Matter 14(11):2717–2744, 2022). The convergence test reveals that it is more reasonable to set the K-point network to 3 × 3 × 1 and the truncation energy to 400 eV. In this paper, a 3 × 3 × 1 supercell structure with 18 S atoms and 9 Mo atoms is selected. The convergence value of the iteration accuracy is 1.0e − 5eV/atom, and all the atomic forces are less than 0.02eV/Å. Additionally, to prevent MoS2 interlayer interaction, a vacuum layer with a thickness of 18 Å is set in the C direction. The geometrical optimization of the model is performed first, and then the corresponding adsorption energies of the model and the nature of the electronic structure are analyzed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
32. First principle study of the effect of doping on the optoelectronic properties of Cr-adsorbed MoS2.
- Author
-
Wei, Ran, Liu, Guili, Su, Dan, Ma, Mengting, Mu, Yansong, Yang, Zhonghua, and Zhang, Guoying
- Subjects
PSEUDOPOTENTIAL method ,MATERIALS science ,NUCLEAR forces (Physics) ,GEOMETRIC modeling ,ELECTRONIC structure ,SIMULATION software ,BORON ,NITROGEN - Abstract
Context: This study explores, for the first time, using first principles, the impact of substitutional doping with boron (B), carbon (C), and nitrogen (N) on the adsorption of chromium (Cr) on monolayer MoS
2 . The effects of doping on the Cr adsorption behavior of MoS2 were investigated using four MoS2 systems, namely, pure, boron (B)-doped, carbon (C)-doped, and nitrogen (N)-doped, in order to gain an in-depth understanding of the mechanism of the effects of doping on the electronic structure and optical properties of Cr adsorbed by MoS2 , to optimize the properties of MoS2 , to explore new areas of application, and to promote the development of materials science. Four MoS2 adsorption systems of Cr adsorption on pure, B-doped, C-doped, and N-doped MoS2 were optimized, and the optimized results showed that the stable adsorption location of Cr on both pure and doped MoS2 was the hollow location at the top of the folded hexagon. The findings reveal that pure MoS2 has an adsorption effect on Cr, and doped elements B, C, and N can promote the adsorption of Cr on MoS2 , and the strong and weak order of this promotion is B > C > N. Methods: In this paper, we use the CASTEP module in the simulation software Materials Studio to perform simulation calculations and analyses to optimize the simulation of Cr adsorption by MoS2 doped with B, C, and N atoms using the generalized gradient approximation (GGA) plane-wave pseudo-potential method (Perdew et al. Phys Rev Lett 77(18):3865–3968, 1996), as well as Perdew-Burke-Ernzerhof (PBE) generalized functionals (Segall et al. J Phys: Condens Matter 14(11):2717–2744, 2022). The convergence test reveals that it is more reasonable to set the K-point network to 3 × 3 × 1 and the truncation energy to 400 eV. In this paper, a 3 × 3 × 1 supercell structure with 18 S atoms and 9 Mo atoms is selected. The convergence value of the iteration accuracy is 1.0e − 5eV/atom, and all the atomic forces are less than 0.02eV/Å. Additionally, to prevent MoS2 interlayer interaction, a vacuum layer with a thickness of 18 Å is set in the C direction. The geometrical optimization of the model is performed first, and then the corresponding adsorption energies of the model and the nature of the electronic structure are analyzed. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
33. The Influence of Boron Doping on the Structures and Composition of Dicalcium Silicate: A Research Study.
- Author
-
Zhang, Da'an, Zhou, Hao, Kang, Guodong, Zhang, Shenghu, Zhang, Cheng, Yan, Xiaofei, Ma, Bing, and Zhang, Houhu
- Subjects
UNIT cell ,BORON ,SILICATES ,LINEAR statistical models ,REGRESSION analysis ,QUANTITATIVE research - Abstract
This paper investigates the structural transformation of dicalcium silicate (C
2 S) crystals brought about through boron doping. Both qualitative and quantitative analyses were conducted to explore the correspondence between boron content and the structure of dicalcium silicate. The results show that boron doping can stabilize β-C2 S and the high-temperature phase α′H -C2 S, and the structural transformation does not involve the modulation of α′L -C2 S. There is a corresponding relationship between the unit cells of β-C2 S and α′H -C2 S, which can be transformed using a transformation matrix. The relationship between boron content and the content of different C2 S structures, as well as the structural expressions for β-C2 S and α′H -C2 S, is determined using linear fitting and multivariable linear regression analysis. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
34. Boron Neutron Capture Therapy: Microdosimetry at Different Boron Concentrations.
- Author
-
Conte, Valeria, Bianchi, Anna, and Selva, Anna
- Subjects
BORON-neutron capture therapy ,NUCLEAR reactions ,ALPHA rays ,MICRODOSIMETRY ,BORON ,NEUTRON irradiation - Abstract
Featured Application: Application of microdosimetric techniques to characterize the mixed radiation field in boron neutron capture therapy. This paper explores the role of microdosimetry in boron neutron capture therapy (BNCT), a cancer treatment involving the selective accumulation of boron-containing compounds in cancer cells, followed by neutron irradiation. Neutron interactions with
10 B induces a nuclear reaction, releasing densely ionizing particles, specifically alpha particles and recoiling lithium-7 nuclei. These particles deposit their energy within a small tissue volume, potentially targeting cancer cells while sparing healthy tissue. The microscopic energy distribution, subject to significant fluctuations due to the short particle range, influences treatment efficacy. Microdosimetry, by studying this distribution, plays a crucial role in optimizing BNCT treatment planning. The methodology employs paired tissue equivalent proportional counters (TEPCs), one with cathode walls enriched with boron and the other without. Precise assessment of boron concentration is essential, as well as the ability to extrapolate results to the actual10 B concentration within the treatment region. The effective10 B concentrations within four boronated TEPCs, containing 10, 25, 70, and 100 ppm of10 B, have been determined. Results show variations of less than 3% from nominal values. Additionally, dose enhancement due to BNC interactions was measured and found to be proportional to the10 B concentration, with a proportionality factor of 7.7 × 10−3 per ppm of boron. Based on these findings, a robust procedure is presented for assessing the impact of BNCT in the treatment region, considering potential variations in boron content relative to the TEPC used. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
35. The Influence of Boron and Carbon Addition on the Glass Formation and Mechanical Properties of High Entropy (Fe, Co, Ni, Cr, Mo)-(B, C) Glassy Alloys.
- Author
-
Kong, Fanli, Inoue, Akihisa, Wang, Fang, and Chang, Chuntao
- Subjects
METALLIC glasses ,ENTROPY ,BORON ,VICKERS hardness ,CORROSION resistance ,SURFACES (Technology) - Abstract
Coatings made from metallic glasses are a promising solution for protecting surfaces of materials in various challenging environments. From an engineering perspective, glassy alloy coatings containing carbon are of greater importance compared to those without carbon but containing boron. Despite anticipating improved coating characteristics, there is no data on using high entropy glassy alloy as a coating material. In this paper, we investigated the influence of the simultaneous addition of boron and carbon elements on the glass-forming ability, thermal stability, crystallization behavior, yield strength, hardness, and corrosion resistance of high entropy (Fe, Co, Ni, Cr, Mo)-(B, C) glassy alloys. It was found that the content of boron and carbon had a significant effect on the improvements of glass-forming ability, mechanical properties, and corrosion resistance. The (Fe
0.25 Co0.25 Ni0.25 Cr0.125 Mo0.125 )75 (B0.7 C0.3 )25 bulk glassy alloy exhibits high glass-forming ability, high yield strength of 3500 MPa, Vickers hardness of 1240, and the highest corrosion resistance among the alloys. We also discussed the reason for their good engineering properties, and the possibility of using high entropy glassy alloys as coating materials, in addition to the guidelines for designing high-performance multicomponent glassy alloys. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
36. Determination of Boron, Lithium and Some Metals in Fly Ash by Laser Ablation -- Inductively Coupled Plasma -- Optical Emission Spectrometry.
- Author
-
Kolmykov, Roman P.
- Subjects
FLY ash ,LASER ablation ,METALS ,SPECTROMETRY ,LITHIUM ,BORON - Abstract
To avoid potentially harmful wet sample preparation is offered to use laser ablation (LA) -- inductively coupled plasma -- optical emission spectrometry (ICPOES) as a method for the elemental analysis of fly ash for boron, lithium, and some metals. For this purpose, synthetic samples were prepared by spiking with dissolved standards. As a result, great stability of calibration curves was achieved. It was found that a particle diameter less than 80 μm in fly ash is enough to have a satisfying homogeneity for successful calibration in the method of standard additions. The average recovery test for reference materials used in the study was 16-77% of the certified values for the elements observed. The low results might be the effect of spiking with calibration samples in the liquid state. This type of analysis requires further investigation. According to the results of elemental analysis, the content of boron and lithium was determined for ZUK-2 and SO-1, which was not previously noticed in other papers. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
37. Conventional and laser-assisted machining of laser-borided Monel 400 alloy.
- Author
-
Kukliński, Mateusz, Przestacki, Damian, Bartkowska, Aneta, Kieruj, Piotr, and Radek, Norbert
- Subjects
MACHINING ,BORON ,LASER beams ,CUTTING force ,ALLOYS ,SURFACE roughness - Abstract
This study concentrates on comparing effects of conventional and laser-assisted machining (LAM) of laser-borided Monel 400 alloy. For this purpose, the shaft made from Monel 400 was covered with 200-µm thick boron layer and surface melted using diode laser. For determining the influence of laser beam scanning velocity on final microstructure, microhardness, and depth of melting, four laser beam scanning velocities were set: 5, 6, 8. and 10 m/min. Obtained microstructures are typical for laser-melted metal and are composed of fine crystals. Microhardness increased significantly due to enriching Monel 400 with boron and the level of this increase depends on the laser beam scanning velocity carried out for the process. During both conventional and laser-assisted turning, cutting forces were measured for comparison. Other compared parameters after carrying out these processes were obtained surface roughness and tool life. It was found that it is possible to form laser-borided surface of Monel 400 alloy by machining and using additional laser-assist has a positive impact on the efficiency of the process. Laser-assisted machining allows to lower cutting forces during machining and this leads to extended tool life. On the other hand, this method provides lower values of roughness parameters on the machined surface due to the effect of softening the surface during the process. The paper is the first description of effects obtained by laser-assisted machining of laser-borided surface. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
38. Resistance to Abrasive Wear with Regards to Mechanical Properties Using Low-Alloy Cast Steels Examined with the Use of a Dry Sand/Rubber Wheel Tester.
- Author
-
Białobrzeska, Beata and Jasiński, Robert
- Subjects
MECHANICAL wear ,CAST steel ,STEEL founding ,LOW alloy steel ,WEAR resistance ,FRETTING corrosion ,RUBBER - Abstract
This paper focuses on relationship between the mechanical properties and abrasive wear resistance, expressed by the K
b index, using an example of low-alloy cast steels. In order to achieve the aim of this work, eight cast steels of varying chemical composition were designed, cast and then heat treated. The heat treatment involved quenching and tempering at 200, 400 and 600 °C. Structural changes caused by tempering are demonstrated by the different morphologies of the carbide phases in the ferritic matrix. In the first part of this paper, the present state of knowledge about the influence of structure and hardness on the tribological properties of steels is discussed. This research involved the evaluation of a material's structure, as well as its tribological and mechanical properties. Microstructural observations were performed using a light microscope and a scanning electron microscope. Next, tribological tests were carried-out with the use of a dry sand/rubber wheel tester. To determine the mechanical properties, Brinell hardness measurements and a static tensile test were carried out. The relationship between the determined mechanical properties and abrasive wear resistance was then investigated. The analyses also provided information regarding the heat treatment states of the analyzed material in the as-cast and as-quenched states. It was found that the abrasive wear resistance, expressed by the index Kb , was most strongly correlated with hardness and yield point. In addition, observations of the wear surfaces indicated that the main wear mechanisms were microcutting and microplowing. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
39. Algae-derived metal-free boron-doped biochar acts as a catalyst for the activation of peroxymonosulfate toward the degradation of diclofenac.
- Author
-
Annamalai S and Shin WS
- Subjects
- Reactive Oxygen Species, Peroxides chemistry, Metals, Water, Diclofenac chemistry, Boron
- Abstract
In this study, plain seaweed biochar (SW) and boron-doped seaweed biochar (BSW) were prepared through a simple pyrolysis process using Undaria pinnatifida (algae biomass) and boric acid. The BSW catalyst was utilized to degrade organic pollutants in aqueous environments by activating peroxymonosulfate (PMS). Surface characterization of the BSW demonstrated successful doping of boron into the biochar materials. BSW
600 exhibited greater catalytic activity than SW600 , as evidenced by the former's maximum adsorption capacity of diclofenac (DCF) onto BSW600 (qmax = 30.01 mg g-1 ) and the activation of PMS. Complete degradation of DCF was achieved in 30 min using 100 mg L-1 BSW600 , 0.5 mM PMS, and 6.5 initial solution pH as critical parameters. The pseudo-first-order kinetic model accurately described the DCF degradation kinetics. The scavenger experiment displayed that radical and non-radical reactive oxygen species (ROS) formed in the BSW600 /PMS system. Furthermore, the generation of ROS in the BSW600 /PMS system was confirmed by electron spin resonance spectroscopy (ESR). The percentage contribution of ROS was assessed to be 12.3, 45.0, and 42.7% for HO• , SO4 •- , and1 O2 , respectively. Additionally, the electron transfer pathway was also confirmed by electrochemical analysis. Moreover, the influence of water matrics on the BSW600 /PMS system was demonstrated. The co-existence of anions and humic acid (HA) did not affect the catalytic activity of the BSW600 /PMS system. The recyclability of BSW600 was assessed by DCF removal (86.3%) after three cycles. Ecological structure-activity relationships software was used to assess by-product toxicity. This study demonstrates the efficacy of non-metallic heteroatom-doped biochar materials as eco-friendly catalysts in groundwater applications., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that may have influenced the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)- Published
- 2023
- Full Text
- View/download PDF
40. Enhancement of fusion energy gain due to the injection of solid boron to fuel capsule utilising the deuteron beam radiation.
- Author
-
Khoramdel, R, Hosseinimotlagh, S N, and Parang, Z
- Subjects
FUSION reactors ,BORON isotopes ,BORON ,INERTIAL confinement fusion ,RADIATION ,LASER beams ,LASER fusion ,DEUTERIUM - Abstract
In a deuterium–tritium (D–T) reactor, large amounts of neutrons are produced. Although a 3 He fusion reactor produces fewer neutrons, 3 He resources are scarce on Earth. As large amount of deuterium fuel sources are available, a D–D reactor on Earth is an ideal reactor. Although it also produces tritium and neutrons, their production rate is not so high. In this paper, the temperature and time behaviour of an ArF laser-driven fusion reactor containing a functional D–D fuel in the low-temperature region controlled through the injection of a solid 11 B capsule is investigated for the first time, whose main fuel is deuterium and boron is the additional fuel. To increase its energy gain, we use the cone guided manner in fast ignition. The results of our calculations show that the injection of deuteron beam simultaneously with laser beam irradiation to the desired spherical fuel capsule causes the bonus energy to be deposited in the fuel capsule and the energy gain increases depending on the amount of deuteron beam energy, and along with that injection of solid boron into D–D fuel increases the energy gain at 100 keV which is about 10 times. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
41. Development of a highly stable nickel-foam-based boron monosulfide–graphene electrocatalyst with a high current density for the oxygen evolution reaction.
- Author
-
Li, Linghui, Watanabe, Norinobu, Jiang, Cheng, Yamamoto, Akiyasu, Fujita, Takeshi, Miyakawa, Masashi, Taniguchi, Takashi, Hosono, Hideo, and Kondo, Takahiro
- Subjects
OXYGEN evolution reactions ,HYDROGEN evolution reactions ,ELECTROCATALYSTS ,CLEAN energy ,BORON ,CATALYTIC activity ,ENERGY conversion - Abstract
As an important part of water splitting, the oxygen evolution reaction (OER) requires efficient, low-cost, and stable catalysts to overcome its sluggish kinetic barrier. In this study, based on previously reported OER catalyst materials of boron monosulfide mixed with graphene (r-BS+G), nickel foam (NF) is introduced as a supporting material for an r-BS+G electrocatalyst. The resulting r-BS+G-NF exhibits a very low overpotential at 10 (245 mV), 100 (308 mV), and 500 (405 mV) mA cm
−2 , with a low Tafel slope (56 mV dec−1 ). In addition, r-BS+G-NF exhibits high durability and can maintain high activity for more than 100 h at 100 mA cm−2 . This is in sharp contrast to the catalyst without graphene (r-BS+NF), which shows lower durability. The results suggest that the unique morphology of the NF provides a large electrochemically active area and exposes more active sites on the surface of the prepared electrocatalyst, while the flexible graphene sheets play an important role as a support for effectively combining r-BS and NF. Consequently, the self-supporting structure can improve the OER performance as well as stability. Therefore, this study provides a promising strategy for use as an efficient and stable OER catalyst at high current densities. In the realm of electrocatalysis and the quest for sustainable energy conversion and storage technologies, our research introduces a distinctive contribution in the form of a nickel-foam-based boron monosulfide – graphene electrocatalyst (r-BS+G-NF) for the Oxygen Evolution Reaction (OER). Thanks to the porous structure of nickel foam and the important role of graphene in combining r-BS and nickel foam, r-BS+G-NF exhibits high catalytic activity and long durability for up to 100 hours. The findings presented in this paper represent a significant advancement in the field of electrocatalysis, with the potential to impact the development of cleaner and more efficient energy conversion and storage technologies. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
42. Boric Acid as A Low-Temperature Graphitization Aid and Its Impact on Structure and Properties of Cellulose-Based Carbon Fibers.
- Author
-
Hückstaedt, Tobias, Erdmann, Jens, Lehmann, André, Protz, Robert, and Ganster, Johannes
- Subjects
CARBON fibers ,BORIC acid ,GRAPHITIZATION ,CATALYSIS ,CELLULOSE fibers ,YOUNG'S modulus ,X-ray scattering - Abstract
In the present paper, a scalable, economically feasible, and continuous process for making cellulose-based carbon fibers (CFs) is described encompassing precursor spinning, precursor additivation, thermal stabilization, and carbonization. By the use of boric acid (BA) as an additive, the main drawback of cellulose-based CFs, i.e., the low carbon yield, is overcome while maintaining a high level of mechanical properties. This is demonstrated by a systematic comparison between CFs obtained from a BA-doped and an un-doped cellulose precursor within a temperature range for carbonization between 1000 and 2000 °C. The changes in chemical composition (via elemental analysis) and physical structure (via X-ray scattering) as well as the mechanical and electrical properties of the resulting CFs were investigated. It turned out that, in contrast to current opinion, the catalytic effect of boron in the formation of graphite-like structures sets in already at 1000 °C. It becomes more and more effective with increasing temperature. The catalytic effect of boron significantly affects crystallite sizes (L
a , Lc ), lattice plane spacings (d002 ), and orientation of the crystallites. Using BA, the carbon yield increased by 71%, Young's modulus by 27%, and conductivity by 168%, reaching 135,000 S/m. At the same time, a moderate decrease in tensile strength by 25% and an increase in density of 14% are observed. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
43. Investigating the possibility of extending the BWR cycle length for 15 years of operation by mixing highly enriched UO 2 fuel with burnable absorbers.
- Author
-
Mustafa SS
- Subjects
- Erbium, Gadolinium, Boron, Uranium
- Abstract
This paper investigates the possibility to extend the cycle length of boiling water reactor bundles to 15 years of operation with three different burnable poisons; gadolinium, erbium, and boron carbide. This can be carried out by mixing highly enriched UO
2 fuel (15-19.9% U-235) with high concentrations of Gadolinium oxide (3-14% Gd2 O3 ) or Erbium oxide (2-4% Er2 O3 ).The boron carbide B4 C was modeled as (Al2 O3 -B4 C) rods in the bundle guide tubes. MCNPX code 2.7 was used to evaluate infinite multiplication factor (K-inf), power distribution, peaking factor, void reactivity coefficient, fuel cycle length, depletion of U-235, and fissile inventory ratio for the three designs at 40% void. The MCNPX simulation showed that introducing gadolinium rods at the bundle periphery has the advantage of lowering reactivity swing throughout the exposure range. The uniform distribution of erbium in all fuel rods contributed to the flattening of peaking factor at all the burnup stages. For the B4 C design, the author found that the assembly with B4 C-Al performs best in terms of reactivity flattening when five of the B4 C-AL2 O3 rods are positioned in the central region of the assembly. Furthermore, the fuel temperature coefficient is more negative for gadolinium design at all burnup stages. On the other hand, the boron model delivers the lowest control rod worth. Finally, the moderator temperature coefficient is more negative for erbium and WABA designs due to the enhanced thermal neutrons capture by the effect of the strategic arrangement of WABA rods and the uniform distribution of erbium., (© 2023. The Author(s).)- Published
- 2023
- Full Text
- View/download PDF
44. Electro-optical properties of strained monolayer boron phosphide.
- Author
-
Mortezaei Nobahari M
- Subjects
- Anisotropy, Electric Conductivity, Electronics, Boron, Data Compression
- Abstract
In this paper, we use tight-binding approximation and linear response theory to study the electronic and optical properties of strained monolayer boron-phosphide (h-BP). Compared with the previous DFT study and adding on-site energy variation to the Hamiltonian, we propose a theoretical approach to investigate the strain effects on the electronic and optical properties of the h-BP. Applying tensile strain increases the gap while compressive strain reduces it as the maximum and minimum of the gap are 1.45 eV and 1.14 eV respectively and are related to the biaxial strain. Also, we investigate the optical conductivity and electron energy loss spectrum (EELS) of the pristine and strained h-BP. The absorption peak of the [Formula: see text] appears in energy about 4 eV but applying strain shifts the peak's energy. Optical properties of pristine h-BP are isotopic and biaxial strain preserves this isotropy, but uniaxial strain exerts anisotropic behavior in the system., (© 2023. The Author(s).)
- Published
- 2023
- Full Text
- View/download PDF
45. Developing boron carbon nitride/boron carbon nitride-citric acid quantum dot metal-free photocatalyst and evaluating the degradation performance difference of photo-induced species for tetracycline via theoretical and experimental study.
- Author
-
Xu Z, Guo Y, Chen L, Yan C, Guo Y, and Xu G
- Subjects
- Humans, Dehydration, Tetracycline, Anti-Bacterial Agents, Metals, Light, Catalysis, Boron, Quantum Dots
- Abstract
For opening a way to synthesize novel metal-free catalysts and clarifying the photodegradation performance difference of photoactive species (such as ·O
2 - ), a series of metal-free photocatalysts have been synthesized by using different existing forms of the same materials (boron carbon nitride (BCN) and boron carbon nitride-citric acid quantum dot (BCQD)) as precursors via calcinating their mixture at 350 °C. BCQD has good fluorescence and up-conversion fluorescence performance. BCN/BCQD-350 has the highest removal efficiency (90%, including adsorption 60% and photodegradation 30%) for tetracycline (TC) among all samples under visible light irradiation. TC adsorption by BCN/BCQD-350 conforms to pseudo-second-order kinetic and Langmuir isotherm models. TC photodegradation by BCN/BCQD-350 conforms to type II heterojunction mechanism. Photoactive species capture experiments suggest that·O+ ), a series of metal-free photocatalysts have been synthesized by using different existing forms of the same materials (boron carbon nitride (BCN) and boron carbon nitride-citric acid quantum dot (BCQD)) as precursors via calcinating their mixture at 350 °C. BCQD has good fluorescence and up-conversion fluorescence performance. BCN/BCQD-350 has the highest removal efficiency (90%, including adsorption 60% and photodegradation 30%) for tetracycline (TC) among all samples under visible light irradiation. TC adsorption by BCN/BCQD-350 conforms to pseudo-second-order kinetic and Langmuir isotherm models. TC photodegradation by BCN/BCQD-350 conforms to type II heterojunction mechanism. Photoactive species capture experiments suggest that·O2 - makes a higher contribution for TC photodegradation, followed by h+ , ·OH,1 O2 and e- . From LC-MS results, TC photodegradation is initiated by the dehydration step. TC dehydration activated by ·O2 - has the lowest barrier (43.4 kcal/mol) than that (50.1 kcal/mol) activated by h+ , that (64.8 kcal/mol) without the activation by photoactive species. TC removal rate of BCN/BCQD-350 (0.01563 min-1 ) is higher than that of g-C3 N4 , P25 (TiO2 ), BNPA, BCNPA, etc. Furthermore, BCN/BCQD-350 can also photodegrade TC under infrared light irradiation (λ > 800 nm)., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)- Published
- 2023
- Full Text
- View/download PDF
46. Spinach-derived boron-doped g-C 3 N 4 /TiO 2 composites for efficient photo-degradation of methylene blue dye.
- Author
-
Faryad S, Azhar U, Tahir MB, Ali W, Arif M, and Sagir M
- Subjects
- Methylene Blue, Water chemistry, Spinacia oleracea, Boron
- Abstract
Green synthesis of nanoparticles can be beneficial due to their low toxicity, cost-effectiveness, and environment-friendliness. Its synthesis involves the use of eco-friendly and biodegradable materials such as plant extracts, natural products, and microorganisms to reduce the negative environmental impacts of traditional nanoparticle synthesis methods. Herein, Spinacia oleracea leaves are used as a boron source, and a visible light active photo-catalyst is produced. The effect of Co-Catalyst Boron in Graphitic carbon nitride based nanocomposites for methylene blue dye photo-degradation in water is examined. Titanium dioxide (TiO
2 ) was activated by changing the hydrogen potential value while utilizing a typical orange dye as a sensitizer. The graphitic carbon nitride/TiO2 nanocomposites were synthesized through a hydrothermal technique. To improve their performance, Boron used as a co-catalyst and B-doped g-C3 N4 /TiO2 nanocomposites prepared through wet chemical co-percipitate mathod. UV-visible spectroscopy, SEM and FTIR spectroscopy were used to analyze the photocatalyst and boron-doped composites in detail. The photocatalytic performance of pristine photocatalyst CNTx (x = 2%,4%,6%,8%) and B-doped CNTx composites were examined for Methylene Blue degradation in the presence of a light source. The spectroscopy analysis showed that B-doped g-C3 N4 /TiO2 -8% nano-composites performed better than all other synthesized pristine catalysts and composites in this research. This research has demonstrated that B-doped g-C3 N4 /TiO2 composites can provide an ideal solution for treating polluted water using visible light as a source to activate these photocatalysts., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023. Published by Elsevier Ltd.)- Published
- 2023
- Full Text
- View/download PDF
47. Structure and Properties of Amorphous Quasi-High-Entropy Fe-Co-Ni-Cr-(Mo,V)-B Alloys with Various Boron Content.
- Author
-
Bazlov, Andrey, Strochko, Ilia, Ubyivovk, Evgeny, Parkhomenko, Mark, Magomedova, Daria, and Zanaeva, Erzhena
- Subjects
MOLYBDENUM ,BORON ,ALLOYS ,VANADIUM alloys ,LEAD alloys ,DIFFERENTIAL scanning calorimetry ,AMORPHOUS alloys - Abstract
This study focuses on the effect of replacing molybdenum with vanadium in rapidly quenched quasi-high-entropy alloys of the Fe-Co-Ni-Cr-(Mo,V)-B system. The paper analyzes the effect of the chemical composition of alloys with different boron content levels on structure formation, characteristic temperatures of alloys, and mechanical properties. An analysis of the relationship between the structure of alloys and their properties is performed. X-ray diffraction and scanning electron microscopy methods were used in the work to establish the structural dependencies. Characteristic temperatures were determined by differential scanning calorimetry. It is suggested that the addition of vanadium to the alloys of this system leads to the formation of vanadium nitrides in the structure, due to the binding of dissolved nitrogen. Furthermore, it is found that replacing molybdenum with vanadium leads to an increase in the thermal stability of the amorphous phase. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
48. Features of Boric Acid Sorption by FIBAN A-5 Anion-Exchange Fiber under Static Conditions.
- Author
-
Butskikh, E. A., Voronyuk, I. V., Eliseeva, T. V., Medyak, G. V., and Polikarpov, A. P.
- Subjects
BORIC acid ,POISONS ,BORON compounds ,DISTRIBUTION isotherms (Chromatography) ,CONCENTRATION gradient ,GRANULATION ,SORPTION - Abstract
Excessive contents of boron and its compounds can exhibit toxic effects despite their necessity for functioning living organisms. An urgent task is to remove them in various ways, including the use of sorption technologies. Boron-selective sorbents with functional OH groups and granular anion exchangers with functional amino groups are capable of extracting boron compounds. This paper is devoted to studying boric acid sorption under static conditions on FIBAN A-5 fibrous sorbent, which shows a high affinity for boron and can be used as an alternative to anion-exchange resins produced in the form of granules. The features of the kinetics and equilibrium of the sorption by the studied fiber brought in contact with boric acid solutions have been studied. It has been found that the time required to reach the equilibrium state decreases with the intensification of stirring and an increase in the concentration gradient in a solution. Sorption isotherms are of a stepwise character due to the existence of boron in different forms at concentrations above 0.025 M. The influence of temperature, pH of a solution, and ionic form of the sorbent on the capacity of FIBAN A-5 fiber has been determined. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
49. A sequential dual-lock strategy for generation of room-temperature phosphorescence of boron doped carbon dots for dynamic anti-counterfeiting.
- Author
-
Yang L, Zhang Q, Huang Y, Luo C, Quan Z, Li H, Sun S, and Xu Y
- Subjects
- Carbon, Temperature, Hydrogen, Boron, Quantum Dots
- Abstract
Stimuli-responsive materials with dynamically switched room-temperature phosphorescence (RTP) aroused great interest. However, the dynamic control of RTP with a color-tunable persistent afterglow by external stimuli is still challenging. Herein, an appealing strategy for constructing dynamic hydrogen-bond networks based on boron-doped carbon quantum dots (BCQDs) was proposed to generate sequence-dependent stimuli-responsive RTP. The BCQDs exhibited bright RTP in paper matrix after successive stimulation by water and heat, demonstrating a fascinating regulation based on an AND logic gate. The RTP generated experienced a reversible switching without attenuation fatigue when BCQDs were heated and exposed to air. The switching of hydrogen-bond network from that among BCQDs to that between BCQDs and paper could facilitate the population of triplet-state BCQDs. The RTP can last a long timie of 10 s after the ceasation of excitation light source. Furthermore, the AND logic gate stimuli-responsive RTP with different colors in papers were obtainded for the first time after blending with various non-RTP dyes. The BCQDs with controllable and on-demand afterglow were further applied for advanced multi-level information encryption and anti-counterfeiting materials. The finding provided assistance to understand the origin and mechanism of the stimuli-responsive RTP of smart materials and offered opportunities for developing multiple continuous stimuli-responsive intelligent RTP materials., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Inc. All rights reserved.)
- Published
- 2023
- Full Text
- View/download PDF
50. Interaction between Boron and Other Elements in Plants.
- Author
-
Long Y and Peng J
- Subjects
- Cadmium metabolism, Aluminum metabolism, Plants metabolism, Boron toxicity, Selenium metabolism
- Abstract
Boron (B) is an essential mineral nutrient for growth of plants, and B deficiency is now a worldwide problem that limits production of B deficiency-sensitive crops, such as rape and cotton. Agronomic practice has told that balanced B and other mineral nutrient fertilizer applications is helpful to promote crop yield. In recent years, much research has reported that applying B can also reduce the accumulation of toxic elements such as cadmium and aluminum in plants and alleviate their toxicity symptoms. Therefore, the relation between B and other elements has become an interesting issue for plant nutritionists. Here we summarize the research progress of the interaction between B and macronutrients such as nitrogen, phosphorus, calcium, potassium, magnesium, and sulfur, essential micronutrients such as iron, manganese, zinc, copper, and molybdenum, and beneficial elements such as sodium, selenium, and silicon. Moreover, the interaction between B and toxic elements such as cadmium and aluminum, which pose a serious threat to agriculture, is also discussed in this paper. Finally, the possible physiological mechanisms of the interaction between B and other elements in plants is reviewed. We propose that the cell wall is an important intermediary between interaction of B and other elements, and competitive inhibition of elements and related signal transduction pathways also play a role. Currently, research on the physiological role of B in plants mainly focuses on its involvement in the structure and function of cell walls, and our understanding of the details for interactions between B and other elements also tend to relate to the cell wall. However, we know little about the metabolic process of B inside cells, including its interactions with other elements. More research is needed to address the aforementioned research questions in future.
- Published
- 2023
- Full Text
- View/download PDF
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.