1,502 results on '"Catalytic degradation"'
Search Results
2. Box-Behnken design optimization of 2D Ti3C2Tx MXene nanosheets as a microwave-absorbing catalyst for methylene blue dye degradation
- Author
-
El-Mas, Salma M., Hassaan, Mohamed A., El-Subruiti, Gehan M., Eltaweil, Abdelazeem S., and El Nemr, Ahmed
- Published
- 2024
- Full Text
- View/download PDF
Catalog
3. Photothermic-catalytic bifunctionality of boron-doped molybdenum disulfide nanosheets enabling simultaneous solar evaporation and antibiotic destruction
- Author
-
Chang, Mingming, Yang, Ruiru, Lai, Xiaojing, Wang, Xinzhi, Liu, Aike, and Jiang, Jing
- Published
- 2024
- Full Text
- View/download PDF
4. Emerging advanced membranes for removal of volatile organic compounds during membrane distillation
- Author
-
Zhang, Na, Zhang, Jiaojiao, Gao, Chuanhui, Yuan, Shideng, and Wang, Zhining
- Published
- 2025
- Full Text
- View/download PDF
5. Facile synthesis of ZnO nanoparticles using Nigella Sativa extract and its role as catalyst in production of bio-oil and degradation of methylene blue dye
- Author
-
Jamil, Huma and Faizan, Muhammad
- Published
- 2024
- Full Text
- View/download PDF
6. Defect-confined Ag clusters on TiO2 for catalytic degradation of N-VOCs and collaborative production of NH3
- Author
-
Jin, Shuaili, Li, Xue, Wang, Jiancheng, Zhu, Tingyu, and Liu, Xiaolong
- Published
- 2025
- Full Text
- View/download PDF
7. Enhanced activation of peroxymonosulfate by introducing Co/Fe atoms in LaCoO3-biochar derived catalysts for the degradation of sulfamethoxazole
- Author
-
Lu, Yanrong, Liu, Wei, Jin, Qi, Zheng, Lili, Dong, Yingbo, and Lin, Hai
- Published
- 2025
- Full Text
- View/download PDF
8. Singlet oxygen-dominated non-radical oxidation pathway for 2,4-Dichlorophenol degradation over CeO2 coated carbon fibers.
- Author
-
Wei, Yuexing, Li, Linyu, Fang, Bin, He, Ziyue, Zhang, Jiansheng, Zhang, Yuxun, Qin, Yuhong, and He, Chong
- Abstract
CeO
2 was uniformly coated onto the surface of carbon fibers (CF) and the resulting CeO2 @CF was employed for the activation of peroxymonosulfate (PMS) to degrade 2,4-Dichlorophenol (2,4-DCP). Under the initial conditions of a PMS concentration of 10 mmol/L, pH range of 3 to 9 and a CeO2 @CF mass concentration of 0.1 g/L, the system achieved complete degradation of 50 mg/L of 2,4-DCP with high mineralization efficiency within 60 min. Additionally, the CeO2 @CF/PMS system showed high efficiency in the presence of coexisted anions (HCO3 − , CO3 2− , SO4 2− , Cl− ) and exhibited excellent purification capability for actual coking wastewater. Combined with characterization analyses (SEM-EDS, XRD, Raman, XPS, and EPR), degradation experiments and radical quenching experiments, the physicochemical properties of the prepared catalyst and the 2,4-DCP degradation mechanism were explored. Results revealed that CeO2 was uniformly coated on the CF surface, maintaining a regular framework structure. During this process, Ce4+ in CeO2 was reduced to Ce3+ , resulting in numerous electron-rich oxygen vacancies forming inside CeO2 @CF. Furthermore, the CeO2 coating increased the amount of oxygen-containing groups (C=O) on the surface of CF and graphite defects. In the CeO2 @CF/PMS system, •O2 − and1 O2 were generated at the active sites of the oxygen vacancies (Vo) and C=O with1 O2 dominated non-free radical pathway and played a notable role in the 2,4-DCP degradation process. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
9. Synthesis of morphology-controlled ternary nanocomposite with the aid of surfactant (CATAB) as structure-directing agent for catalytic oxidation of organic azo dye.
- Author
-
Da’na, Enshirah, Taha, Amel, Dafallah, Samah, and El-Aassar, Mohamed R.
- Subjects
- *
CATALYTIC oxidation , *CATALYTIC activity , *CONGO red (Staining dye) , *CATALYSTS , *SURFACE area - Abstract
A novel synthesis approach was applied to deposit tri-metal oxide nanocomposite, AL₂O₃/TiO₂/ZnO, onto surfactant template in an attempt to control the morphology and reduce the aggregation . Consequently, increases the surface area available for catalytic activity. Different samples were prepared by varying the amount of CTAB as a structure-directing agent. Samples were characterized by SEM, XRD, UV-Vis, DLS, TGA, FTIR, and nitrogen adsorption. The nanocomposites were tested for the catalytic oxidation of Congo red (CR). Calcination resulted in higher activity as a result of removing the template and thus leaving empty pores with higher surface area. Before calcination, the amount of CATAB added inversely affected both available surface area and activity. The maximum oxidation efficiency was 92%. TOC analysis confirmed mineralization of CR by 82% drop. After four successive cycles, only 3% reduction in catalysis activity was observed. Overall, this proposed method is very promising in controlling morphology, structural properties, and catalytic activity of catalyst. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
10. Nano gold catalyst preparation and it’s <italic>p</italic>-nitrophenol catalytic degradation properties.
- Author
-
Jia-li, Xiao, Wen-yuan, Wen, Long-sheng, Zhou, Gui-hua, Cao, and Dong-fan, Liu
- Subjects
- *
GOLD catalysts , *CATALYTIC activity , *REDUCING agents , *X-ray diffraction , *NITROPHENOLS - Abstract
Cacumen platyclade extracts were utilized as the reducing agent to prepare Au/Al2O3 composites. XRD, BET, SEM, TEM were employed to characterize the properties of the catalyst. The catalytic activity of Au/Al2O3 was studied by using NaBH4 as the reducing agent and nitrophenol as the pollutant. The results showed that the Au/Al2O3 catalyst, calcinated at 400 °C, exhibited the highest catalytic activity. With a catalyst dosage of 1 g L−1, 2 mL NaBH4 of 0.15 mol L−1 could degrade 96.5 % nitrophenol in 21 min at 298 K, with a reaction constant of 0.16 min−1. Furthermore, thep -nitrophenol degradation ratio decreased by 0.8 % after ten cycles. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
11. 废旧热固性不饱和聚酯树脂可控催化降解制备水凝胶——大学化学综合实验设计.
- Author
-
刘利娟 and 王雄雷
- Subjects
- *
UNSATURATED polyesters , *PLASTIC scrap , *CHEMISTRY experiments , *POLLUTION , *CATALYSIS - Abstract
A comprehensive chemistry experiment is recommended. In this experiment, the pretreatment, controllable catalytic degradation, analytical characterization of thermosetting unsaturated polyester resin and gel swelling were mainly included. The students could not only gain the knowledge on the waste plastic pollution, but also get the basic principles and methods of controllable catalysis and gel preparation. The experiment enables students to experience the theory applying to practice and making waste profitable, which helps to enhance students’ interest in chemical experiments and cultivate their comprehensive innovation ability. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
12. Effect of Nickel Impurities in Pyrite on Catalytic Degradation of Thiosulfate.
- Author
-
Qin, Xuecong, Zhang, Tao, Qin, Wenhua, and Zhang, Hongbo
- Subjects
COPPER ,COPPER ions ,LIGHT absorption ,NICKEL ,PYRITES - Abstract
The effects of nickel content in nickel-bearing pyrite on photocatalytic properties, light absorption properties, and oxidative decomposition of thiosulfate were studied. The leaching experiments show that the consumption of thiosulfate in the Cu
2+ -ethylenediamine (en)-S2 O3 2− system increases with an increase in nickel content in nickel-bearing pyrite. The consumption of Cu(en)2 2+ initially increases and then decreases with an increase in leaching time. There is a clear correlation between the change trend in its consumption and the doping amount of nickel in pyrite. The XPS results show that in the Cu2+ -ethylenediamine (en)-S2 O3 2− leaching gold system (temperature 25 °C, time 35 h, solution: 0.1 mol/L S2 O3 2− , 5 mmol/L Cu(en)2 2+ , 200 mL solution), the nickel of pyrite-containing nickel can be transferred to the leaching solution and becomes nickel ion. In this leaching system, Cu(II), which was originally complexed with en, is reduced to Cu(I) in a short time. The consumption of Cu(en)2 2+ increased rapidly in the 5 h period and then decreased gradually after 5 h. The results showed that the presence of free Ni2+ in the solution facilitated the conversion of bivalent copper ions to monovalent copper ions. Free Ni2+ ions can compete with Cu2+ ions for en ligands. When ethylenediamine complexes with Ni2+ , the decomposition of Cu(en)2 2+ into Cu(en)+ and en occurs more rapidly. And the en, which was originally to be oxidized with Cu(en)+ to form Cu(en)2 2+ , forms Ni(en)2 2+ . As a result, the concentration of Cu(en)2 2+ continues to decrease in a short period of time. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
13. Dynamic Regulation of Hydrogen Bonding Networks and Solvation Structures for Synergistic Solar-Thermal Desalination of Seawater and Catalytic Degradation of Organic Pollutants
- Author
-
Ming-Yuan Yu, Jing Wu, Guang Yin, Fan-Zhen Jiao, Zhong-Zhen Yu, and Jin Qu
- Subjects
Solar steam generation ,Seawater desalination ,Catalytic degradation ,Bacterial cellulose ,Cobalt hydroxycarbonate nanorods ,Technology - Abstract
Highlights A flow-bed water purification system with an asymmetric solar-thermal and catalytic membrane is designed for synergistic solar-thermal desalination of seawater/brine and catalytic degradation of organic pollutants. The hydrogen bonding networks can be regulated by the abundant surface –OH groups and the in situ generated ions and radicals during the degradation process for promoting solar-driven steam generation. The de-solvation of solvated Na+ and subsequent nucleation/growth of NaCl are effectively inhibited by SO4 2−/HSO5 − ions. more...
- Published
- 2024
- Full Text
- View/download PDF
14. Performance and mechanism of catalytic degradation of benzotriazole in water by Fe2O3-CuO/rCG
- Author
-
GUO Zirui, LI Hongyan, ZHANG Feng, CUI Jiali, YANG Qun, and LI Yun
- Subjects
coal gangue ,catalyst ,adsorption ,catalytic degradation ,benzotriazole ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
Iron-copper modified coal gangue(Fe2O3-CuO/rCG) was prepared using coal gangue(CG) as raw material through calcination, acid leaching and metal modification. The morphology and structure of Fe2O3-CuO/rCG were characterized and analyzed, and the degradation efficiency and mechanism of Fe2O3-CuO/rCG system on benzotriazole(BTA) were studied. The results showed that the specific surface area and total pore volume of Fe2O3-CuO/rCG significantly increased after modification. Fe2O3 and CuO were successfully filled inside the pores of materials. The optimal preparation conditions for Fe2O3-CuO/rCG were calcination temperature of 650 ℃, calcination time of 3 hours, and metal ion loading concentration of 0.07 mol/L. The optimal conditions for BTA degradation in Fe2O3-CuO/rCG/H2O2 system were BTA concentration of 30 mg/L, Fe2O3-CuO/rCG dosage of 2 g/L, H2O2 concentration of 7 mmol/L, temperature of 25 ℃, and rotational speed of 240 r/min. After 2 hours of reaction, the highest degradation rate of BTA in system could reach 94.86%, and the removal rates of TOC and TN could reach 87.69% and 84.27%, respectively. The Fe2O3-CuO/rCG coupled Fenton system had two main mechanisms for removing BTA:adsorption and catalytic degradation. Adsorption mainly involved gap filling, ligand adsorption, and hydrogen bonding. During the catalytic degradation process, ·OH and 1O2 were the main active species, with dominated by 1O2. Moreover, the redox cycle of Fe2+/Fe3+ and Cu+/Cu2+ accelerated the generation of active species in Fenton-like system. more...
- Published
- 2024
- Full Text
- View/download PDF
15. Dynamic Regulation of Hydrogen Bonding Networks and Solvation Structures for Synergistic Solar-Thermal Desalination of Seawater and Catalytic Degradation of Organic Pollutants.
- Author
-
Yu, Ming-Yuan, Wu, Jing, Yin, Guang, Jiao, Fan-Zhen, Yu, Zhong-Zhen, and Qu, Jin
- Subjects
- *
WATER purification , *CHEMICAL kinetics , *RADICAL ions , *HYDROGEN bonding , *NANORODS , *SALINE water conversion - Abstract
Highlights: A flow-bed water purification system with an asymmetric solar-thermal and catalytic membrane is designed for synergistic solar-thermal desalination of seawater/brine and catalytic degradation of organic pollutants. The hydrogen bonding networks can be regulated by the abundant surface –OH groups and the in situ generated ions and radicals during the degradation process for promoting solar-driven steam generation. The de-solvation of solvated Na+ and subsequent nucleation/growth of NaCl are effectively inhibited by SO42−/HSO5− ions. Although solar steam generation strategy is efficient in desalinating seawater, it is still challenging to achieve continuous solar-thermal desalination of seawater and catalytic degradation of organic pollutants. Herein, dynamic regulations of hydrogen bonding networks and solvation structures are realized by designing an asymmetric bilayer membrane consisting of a bacterial cellulose/carbon nanotube/Co2(OH)2CO3 nanorod top layer and a bacterial cellulose/Co2(OH)2CO3 nanorod (BCH) bottom layer. Crucially, the hydrogen bonding networks inside the membrane can be tuned by the rich surface –OH groups of the bacterial cellulose and Co2(OH)2CO3 as well as the ions and radicals in situ generated during the catalysis process. Moreover, both SO42− and HSO5− can regulate the solvation structure of Na+ and be adsorbed more preferentially on the evaporation surface than Cl−, thus hindering the de-solvation of the solvated Na+ and subsequent nucleation/growth of NaCl. Furthermore, the heat generated by the solar-thermal energy conversion can accelerate the reaction kinetics and enhance the catalytic degradation efficiency. This work provides a flow-bed water purification system with an asymmetric solar-thermal and catalytic membrane for synergistic solar thermal desalination of seawater/brine and catalytic degradation of organic pollutants. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
16. Green synthesis of ZnO/Fe3O4 nanoparticles with nigella sativa extract: Efficient degradation of methylene blue and antimicrobial properties.
- Author
-
Bhanoojo, Noor Ali, Talpur, Mohammad Younis, Mahesar, Sarfaraz Ahmed, Hassan, Syeda Sara, Nadeem Ahmed, Ume Hanee, and Durmaz, Fatih
- Subjects
BLACK cumin ,METHYLENE blue ,NANOPARTICLE size ,FOURIER transform infrared spectroscopy ,X-ray diffraction - Abstract
Zinc oxide (ZnO), iron oxide (Fe
3 O4 ) NPs, and ZnO/Fe3 O4 nanocomposites (NCs) were synthesized using Nigella sativa (NS) seed extracts. These nanomaterials (NMs) were characterized by multiple analytical techniques like UV-visible spectrophotometers, FTIR spectroscopy, SEM, and XRD spectroscopy. The UV-visible spectrum showed 364 nm, 330 nm, and 331nm for ZnO NPs, Fe3 O4 NPs, and ZnO/Fe3 O4 NCs, respectively. Moreover, it was confirmed when the samples were run through FTIR techniques, and it was observed that the availability of bioactive functional groups was involved in the decline of bulk compounds to NPs. XRD showed their average nanoparticle size based on applying the formula of full width at half maximum (FWHM) for ZnO NPs, Fe3 O4 NPs, and ZnO/Fe3 O4 NCs at 29.52 nm, 22.08 nm, and 12.82 nm, respectively. In this study, NPs and NCs reduced Methylene Blue (MB) dye, and a UV-visible spectrophotometer investigated their catalytic activities. MB dye showed the maximum absorption peak at 664 nm. The reaction of MB was reduced using synthesized products with an accompanying color change reaction from blue to colorless within 60 min at 84%, 86%, and 99.5% degradation for ZnO NPs, Fe3 O4 NPs, and ZnO/Fe3 O4 NCs with rate constants of 0.00035, 0.00065, and 0.0015 Lmol-1S-1. The 2nd order rate constant was observed in this study. The agar disc diffusion method was used to investigate the potential antibacterial activity of synthesized NPs and NCs. This study is best suited for Gram-positive bacteria. NS seed extract-based synthesis of NCs could be an excellent catalyst and biological application for environmental pollution. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
17. Production of pyrite-based catalysts supported on graphene oxide and zinc oxide to treat drug mixture via advanced oxidation processes.
- Author
-
de Oliveira Marques Cavalcanti, Vanessa, Napoleão, Daniella Carla, Santana, Ingrid Larissa da Silva, Santana, Rayany Magali da Rocha, Lucena, Alex Leandro Andrade de, and da Motta Sobrinho, Maurício Alves more...
- Subjects
ZINC oxide ,ZINC catalysts ,TOXICITY testing ,GRAPHENE oxide ,CATALYST supports ,PYRITES - Abstract
Advanced oxidation processes (AOP) stood out as an efficient alternative for the treatment of organic contaminants. In this work, there were proposed syntheses of mixed catalysts of pyrite and graphene oxide and pyrite and zinc oxide to treat a mixture of the drugs atenolol and propranolol in aqueous solution through the photo-Fenton process with ultraviolet radiation. The efficiency of the methodologies used in the syntheses was confirmed through different characterization analyses. It was verified that the pyrite and zinc oxide catalyst led to the best contaminant degradation percentages with values equal to 88 and 84% for the groups monitored at the wavelengths (λ) of 217 and 281 nm. The degradation kinetics presented a good fit to the kinetic model proposed by Chan and Chu (2003) with R
2 equal to 0.99, indicating a pseudo-first-order degradation profile. Finally, toxicity tests were carried out with two types of seeds, watercress and cabbage, for the solution before and after treatment. The cabbage seeds showed a reduction in germination percentages for the samples after treatments, while no toxicity was observed for watercress ones. This highlights the importance of evaluating the implications caused by products in relation to different organisms representing the biota. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
18. Plant‐assisted synthesis of Fe3O4 nanoparticles for catalytic degradation of methyl orange dye and electrochemical sensing of nitrite.
- Author
-
Husnaa Mohd Taib, Siti, Moozarm Nia, Pooria, Rasit Ali, Roshafima, Izadiyan, Zahra, Izzah Tarmizi, Zatil, and Shameli, Kamyar
- Subjects
- *
IRON electrodes , *IRON oxide nanoparticles , *CARBON electrodes , *OXIDE electrodes , *ROSELLE , *NITRITES - Abstract
The present study details a more environmentally friendly method for synthesizing iron oxide nanoparticles (Fe3O4‐NPs) utilizing Hibiscus sabdariffa (H. sabdariffa) leaf extract. The produced H. sabdariffa/Fe3O4‐NPs underwent characterization through VSM, XRD, FESEM‐EDX, TEM and FTIR analyses. The FESEM and TEM images revealed that the H. sabdariffa/Fe3O4‐NPs had a narrow distribution and an average particle size of 5±2 nm. Catalytic degradation studies of the synthesized Fe3O4‐NPs exhibited efficient reduction of methyl orange (MO) dye. The degradation of MO catalysed by H. sabdariffa/Fe3O4‐NPs follow the pseudo‐first order kinetics, with a rate constant of 0.0328 s−1 (R2=0.9866). Moreover, in electrochemical sensing studies, the anodic peak current of nitrite (NO2−) for H. sabdariffa/Fe3O4‐NPs/GCE showed a linear relationship with its concentration within the range of 0.5–7.5 mM, achieving a detection limit of 0.29 μM. These findings demonstrate that the modified electrode with Fe3O4‐NPs synthesized using H. sabdariffa leaf extract serve as a novel electrochemical sensor for determining NO2− with high sensitivity and reproducibility. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
19. Visible Light-Assisted Periodate Activation Using Carbon Nitride for the Efficient Elimination of Acid Orange 7.
- Author
-
Xu, Wenjun, Wang, Qianyi, He, Jintao, Liu, Fuzhen, Yan, Xiang, and Xu, Yin
- Subjects
- *
ELECTRON paramagnetic resonance , *PROCESS capability , *REACTIVE oxygen species , *VISIBLE spectra , *WASTEWATER treatment , *NITRIDES - Abstract
The development of appropriate and effective periodate (PI) activation technology is currently a popular research area. This study presents a novel efficient photocatalytic activation approach of PI for pollutant degradation based on carbon nitride (g-C3N4) and visible light (Vis). The results show that the system can remove 92.3% of acid orange 7 (AO7) within 60 min under the g-C3N4/PI/Vis reaction system. The degradation rate constant (kobs) reached 4.08 × 10−2 min−1, which is 4.21, 5.16 times, and 51.3 times higher than that of the g-C3N4/Vis system (9.7 × 10−3 min−1), PI/Vis system (7.9 × 10−3 min−1) and the g-C3N4/PI system (7.96 × 10−4 min−1), respectively. Clearly, the addition of PI significantly enhances the degradation efficiency of AO7 in the system. Additionally, under the same reaction conditions, the presence of PI showed excellent oxidation capacity in the photoactivation process compared with other common oxidants, such as peroxymonosulfate, peroxydisulfate, and H2O2. Moreover, the g-C3N4/PI/Vis system showed excellent removal of AO7 across a wide range of pH levels and in the presence of various anions. Electron paramagnetic resonance (EPR) and quenching experiments suggested that the superoxide anions (•O2−) and singlet oxygen (1O2) dominated in the oxidation of pollutants in the g-C3N4/PI/Vis system. In addition, the catalyst showed relative stability during cyclic testing, although a slight reduction in degradation efficiency was observed. In brief, the g-C3N4/PI/Vis system is highly efficient and environmentally friendly, with significant application potential in wastewater treatment. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
20. Fe2O3-CuO/rCG 催化降解水中苯并三氮唑的效能与机理.
- Author
-
郭紫瑞, 李红艳, 张峰, 崔佳丽, 杨群, and 李赟
- Abstract
Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute 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.) more...
- Published
- 2024
- Full Text
- View/download PDF
21. Fabrication of electrospun PA66 nanofibers loaded with biosynthesized silver nanoparticles: investigation of dye degradation and antibacterial activity.
- Author
-
Kahraman, Havva Tutar
- Subjects
THERMOGRAVIMETRY ,TRANSMISSION electron microscopes ,SILVER nanoparticles ,SCANNING electron microscopes ,INFRARED spectroscopy - Abstract
In the current study, silver nanoparticles (AgNPs) incorporated Polyamide 66 (PA66) nanofiber mat as a photocatalyst which was prepared using electrospinning technique for degradation of methyl orange (MO). Considering the lack of reported studies on the influence of the ultrasonication on the size and stability of AgNPs, the purpose of the study was to produce a small size of AgNPs and compare it with the continuous stirring method. It is reasonable to report that the advantage of ultrasonication is to generate relatively smaller AgNPs (u-AgNPs) compared to fabrication by continuous stirring method (s-AgNPs). Helichrysum arenarium (HA) extract was used as a reducing agent as well as a capping agent in green synthesis of AgNPs. AgNPs were characterized by UV–visible spectrophotometry, Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and transmission electron microscope (TEM). PA66/u-AgNs nanofibers were then successfully electrospun and characterized by using scanning electron microscope (SEM), FT-IR, thermal gravimetric analysis (TGA), and water contact angle measurement (WCA). Fabricated PA66-based nanofiber mat with smooth surface and uniform diameters (330–340 nm) was used as a catalyst in MO degradation. PA66/u-AgNP nanofibers were also evaluated for antibacterial performance and showed significant inhibition against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa bacteria. According to these findings, it is expected that the fabricated novel PA66/u-AgNP nanofibers can be announced as a promising potent and applied to the wastewater applications. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
22. Photocatalytic performance of Au/Bi4Ti3O12 composite improved by synergistic piezoelectric effect and exciton-plasmon.
- Author
-
Zhang, Jiahui, Ma, Ligen, Gu, Hongrui, Xia, Weiwei, He, Junhui, Sun, Hui, and Liu, Junliang
- Subjects
- *
PIEZOELECTRICITY , *IRRADIATION , *SURFACE plasmon resonance , *GOLD nanoparticles , *FERROELECTRIC materials , *ULTRASONIC waves , *ENERGY conversion - Abstract
Bi 4 Ti 3 O 12 (BiTO) is a typical bismuth-layered Aurivillius ferroelectric material for its potential application in photocatalysis. In this study, Au/BiTO hybrid was fabricated by precipitating Au nanoparticles onto BiTO nanoflake using a sodium citrate reduction route. This integration has led to a remarkable enhancement in the photocatalytic efficiency, which is attributed to the synergistic coupling of piezoelectric effect of BiTO with the localized surface plasmon resonance (LSPR) of Au nanoparticles. The incorporation of Au nanoparticles onto the BiTO matrix has significantly boosted the light absorption and charge carrier separation, thereby augmenting the photocatalytic activity. Notably, Au/BiTO-2 composite exhibits exceptional photocatalytic performance, demonstrating the complete degradation of RhB within 40 min under full-spectrum light irradiation. Moreover, Au/BiTO-2 displays a robust photocatalytic action against other organic pollutants, including methyl orange (MO), ofloxacin (OFLX) and tetracycline hydrochloride (TC). Further enhancement of photocatalytic process is achieved when combing light irradiation with ultrasonic excitation. The ultrasonic waves break the static spontaneous polarization through alternating piezoelectric potential, which accelerates the catalytic reaction. The photocatalytic action rate of Au/BiTO-2 toward RhB reaches a value as high as 0.0984 min−1, which is nearly 2.3 folds increasement compared to that of pristine BiTO. The possible synergistic mechanism caused by piezoelectric effect and exciton-plasmon effect is discussed in detail. The work not only enriches our understanding of the underlying principles but also supply a new strategy to design high-performance catalysts in the field of environmental remediation and energy conversion. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
23. 对苯二甲酸乙二醇酯降解机理密度泛函的理论研究.
- Author
-
周梅, 李思佳, 徐玮峰, 黄金保, 罗小松, and 吴雷
- Abstract
Mechanism degradation of ethylene terephthalate momer was investigated by density functional theory B3P86/6-31++G (d, p) method, the possible reaction paths of pyrolysis/hydrolysis/alcoholysis and catalytic degradation were designed, the geometric structures of various intermediates, transition states, and products involved in the reaction were optimized, and their frequencies were calculated to gain the thermodynamic and kinetic parameters. The calculation results show that: When water or methanol is used as a catalyst in the ethylene terephthalate process of thermal degradation, the use water or methanol O-H provides H to the main chain of the ethylene terephthalate ester bond on the carbonyl O atom is form terephthalic acid, and ethyl C off H atoms and (water) hydroxyl (-OH) or (methanol) methoxy group (-OCH3) are combined to form new water or methanol, thereby reducing the reaction energy barriers during the pyrolysis of ethylene terephthalate (251.4 kJ/mol→181.1 kJ/mol (methanol) and 187.5 kJ/mol (water)). When water or methanol is reactant in the thermal degradation process of ethylene terephthalate, H in water or methanol O-H is supplied to the carbonyl O atom of the main chain of ethylene terephthalate to form ethylene glycol. Hydroxy group (-OH) in water or methoxy group (-OCH3) in methanol binds to the carbonyl C atom of the carbonyl group of ethylene terephthalate backbone to form terephthalic acid or mono-methyl terephthalate, it further reduces the reaction energy barriers (156.4 kJ/mol (methanol) and 170.1 kJ/mol (water)) during the pyrolysis of ethylene terephthalate. In the reaction process, either water/methanol as catalysis or water/methanol as reactants can reduce the reaction energy barrier of the main element step to a certain extent, so that the reaction is easy to proceed. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
24. Sludge Recycling from Non-Lime Purification of Electrolysis Wastewater: Bridge from Contaminant Removal to Waste-Derived NO X SCR Catalyst.
- Author
-
Gao, Ju, Sun, Fucheng, Liu, Pei, Zhou, Jizhi, and Zhang, Yufeng
- Subjects
- *
INDUSTRIAL wastes , *WASTE treatment , *CATALYTIC reduction , *WASTEWATER treatment , *MODULATION (Music theory) - Abstract
Catalysts for the selective catalytic reduction (NOX SCR) of nitrogen oxides can be obtained from sludge in industrial waste treatment, and, due to the complex composition of sludge, NOX SCR shows various SCR efficiencies. In the current work, an SCR catalyst developed from the sludge produced with Fe/C micro-electrolysis Fenton technology (MEF) in wastewater treatment was investigated, taking into account various sludge compositions, Fe/C ratios, and contaminant contents. It was found that, at about 300 °C, the NOX removal rate could reach 100% and there was a wide decomposition temperature zone. The effect of individual components of electroplating sludge, i.e., P, Fe and Ni, on NOX degradation performance of the obtained solids was investigated. It was found that the best effect was achieved when the Fe/P was 8/3 wt%, and variations in the Ni content had a limited effect on the NOX degradation performance. When the Fe/C was 1:2 and the Fe/C/P was 1:2:0.4, the electroplating sludge formed after treatment with Fe/C MEF provided the best NOX removal rate at 100%. Moreover, the characterization results show that the activated carbon was also involved in the catalytic reduction degradation of NOX. An excessive Fe content may cause agglomeration on the catalyst surface and thus affect the catalytic efficiency. The addition of P effectively reduces the catalytic reaction temperature, and the formation of phosphate promotes the generation of adsorbed oxygen, which in turn contributes to improvements in catalytic efficiency. Therefore, our work suggests that controlling the composition in the sludge is an efficient way to modulate SCR catalysis, providing a bridge from contaminant-bearing waste to efficient catalyst. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
25. Magnetoplasmonic core–shell structured Ag@Fe3O4 particles synthesized via polyol reduction process rendering dual-functionality for bacteria ablation and dyes degradation
- Author
-
Qing Shen, Luping Zhang, Yuan Zhao, Xiaobing Han, Jie Gao, Yuesheng Li, Xiaoming Zhu, Tian Liang, and Tao Chen
- Subjects
Magnetoplasmonic ,Core shell structure ,Ag ,Fe3O4 ,Antibacterial ,Catalytic degradation ,Chemistry ,QD1-999 - Abstract
The Ag nanoparticles demonstrate potent bacteria eradication capabilities; however, their tendency to aggregate in aqueous solutions compromises the antibacterial efficacy. Furthermore, the Ag nanoparticles employed in sewage treatment are challenging to recycle, resulting in environmental pollution and resource wastage. Herein, the Ag-core Fe3O4-shell structured particles (Ag@Fe3O4) are synthesized by leveraging the reduction potential difference between Ag+/Ag0 and Fe3+/Fe2+ through a one-step polyol reduction process. The Fe3O4 shell in the Ag@Fe3O4 composite not only effectively inhibits the agglomeration of Ag, but also enhances the penetration capability of the composite into biofilms, thereby enabling Ag@Fe3O4 to possess remarkable antibacterial efficacy against Escherichia coli (E. coli). The Ag@Fe3O4 demonstrates nearly 100 % inhibition of E. coli at a concentration of 0.24 mg mL−1 (with an Ag content of 0.042 mg mL−1) while still maintaining antibacterial effectiveness of 74.6 % even after undergoing reutilization for 10 cycles. Meanwhile, due to the excellent electron conductivity of Ag and the effective adsorption capability of Fe3O4 shell towards organic dyes, Ag@Fe3O4 facilitates rapid electron transfer to organic dyes and further lead to their reduction and degradation in the presence of NaBH4. The Ag@Fe3O4 can catalytically degrade various organic dyes (including Rhodamine B, Rhodamine 6G, and Methylene blue) within only 15 min, while achieving an impressive degradation efficiency exceeding 90.9 % after 6 cycles of reutilization. The cost-effectiveness (approximately $0.17 per gram), facile magnetic recovery, along with the superior antibacterial and dye-degradation performance showcase the significant potential of Ag@Fe3O4 for medical applications and sewage treatment. more...
- Published
- 2025
- Full Text
- View/download PDF
26. RAPID DEGRADATION OF MALACHITE GREEN DYE WASTEWATER USING H2O2 UNDER RECYCLABLE SILICA/MAGNETIC NANOCATALYST
- Author
-
Jingheng Ning, Rui Wei, Liming Sha, Chang Sun, Qunying Zuo, Dong-er Chen, Jiaqian Wei, and Qiongcan Hu
- Subjects
Fe3O4@SiO2 magnetic nanoparticles ,malachite green ,H2O2 ,catalytic degradation ,Chemistry ,QD1-999 - Abstract
The discharge of dye contaminant malachite green (MG) into the water environment will seriously affect human health. In this paper, Fe3O4@SiO2 magnetic nanoparticles were prepared as catalysts using co-precipitation and sol-gel methods, which accelerated the removal of MG by H2O2 over a wide pH range with remarkable results. The degradation mechanism is consistent with the Fe2+-H2O2 Fenton system and the pseudo-first-order kinetic model, and the degradation rate can be increased by 179 times compared with not using this catalyst. When pH ≥ 5, Fe3O4@SiO2 catalyzes H2O2 oxidation of MG for only 10 min to achieve a high degradation rate of 99%, and less than 3 min to achieve a 95% degradation rate. The catalyst can be quickly separated and easily regenerated under an external magnetic field, and a degradation rate of 82% can still be reached after 5 uses. In a word, this work has successfully developed an efficient, green and economic MG wastewater treatment technology. more...
- Published
- 2024
- Full Text
- View/download PDF
27. Enhanced sonophoto-catalytic and adsorption capabilities of Fe3O4@MC/MWCNT-CuO/Ag for petrochemical organic pollutants degradation from industrial process streams
- Author
-
Saeed Rajabi, Hassan Hashemi, Mohammad Reza Samaei, Alireza Nasiri, Abooalfazl Azhdarpoor, and Saeed Yousefinejad
- Subjects
Advanced oxidation process ,Catalytic degradation ,Hybrid nanostructure ,Persistent organic pollutant ,Water purification ,Chemistry ,QD1-999 - Abstract
To address the problem of petrochemical organic pollutants in water, specifically monoethylene glycol (MEG) present in industrial process streams, in this research, we synthesized and evaluated a multifunctional nanocomposite, Fe3O4@MC/MWCNT-CuO/Ag. The nanocomposite was produced by combining magnetic Fe3O4 nanoparticles, methylcellulose (MC), multi-walled carbon nanotubes (MWCNTs), and CuO/Ag nanoparticles by an integrated synthesis process. A consistent dispersion of nanoparticles, with diameters ranging from 30-40 nm, was discovered by FESEM analysis, showing effective integration without aggregation. Effective synthesis was demonstrated by well-doped and evenly dispersed CuO and Ag nanoparticles. Functional groups that improve electrostatic interactions with contaminants hence enhancing catalytic performance and adsorption efficiency, were validated by FTIR analysis. XRD indicated an unchanged crystal structure with an average crystallite size of 8.67 nm. The anticipated elemental composition was verified by EDS & mapping. A VSM study revealed magnetic characteristics (9.33 emu/g) that simplify nanocomposite separation and reuse. TGA proved thermal stability to be up to 600 °C. A BET study showed a highly specific surface area of 67.661 m2/g, enhancing adsorption. According to DRS and PL studies, the bandgap was lowered by 1.31 eV, which led to better optical absorption. The nanocomposite exhibited notable MEG removal efficiency, with 72 % in adsorption, 65 % in photocatalysis, and 56 % in sonocatalysis. This makes it a promising alternative for the remediation of organic pollutants in water treatment. more...
- Published
- 2024
- Full Text
- View/download PDF
28. Development of a flow reactor incorporating polydopamine-poly(ε-caprolactone) with gold particles.
- Author
-
Cao, Yu, Hsu, Yu-I, and Uyama, Hiroshi
- Abstract
[Display omitted] • A flow reactor was developed for dye wastewater degradation. • A continuous catalysis for degrading the dye-contaminated wastewater was achieved. • A high degradation efficiency was achieved compared to traditional batch method. • The flow reactor showed remarkable resuability. Addressing the significant challenge of dye wastewater pollution, this study introduces a novel solution employing a flow catalytic reactor loaded with gold (Au) particles. The reactor utilizes a porous monolithic material with a Poly(ε-caprolactone) (PCL) matrix as the carrier for Au particles, with polydopamine employed to immobilize the Au onto the surface of the PCL monolith. To assess the catalytic efficiency of the reactor, a model catalytic degradation experiment involving the reaction between methyl orange (MO) and sodium borohydride was conducted. The catalytic reaction was facilitated by a peristaltic pump. The reactor setup involved fixing the monolith within a heat shrinkable tube, and the peristaltic pump ensured the flow catalytic reaction. The protective effect of liquid nitrogen was utilized to confirm that the porous structure of the PCL monolith, with its low melting point, remained intact after being fixed in the heat shrink tube. Catalytic results revealed remarkable efficacy, with the decomposition efficiency of MO reaching 98.54%. This flow reactor enables continuous operation, making it more practical for real-world applications compared to traditional batch methods. Furthermore, even after 5 cycles, the sample maintained a catalytic efficiency exceeding 90%, demonstrating the excellent reusability of the reactor. [ABSTRACT FROM AUTHOR] more...
- Published
- 2025
- Full Text
- View/download PDF
29. 2, 4-Dichlorophenol Degradation Mechanism over Co3O4@Carbon Fiber with Induced Electron-poor/rich Electronic Center by Activating PMS
- Author
-
ZHANG Yuxun, WEI Yuexing, JIAO Luchang, QIN Yuhong, SHEN Haonan, HE Chong, and CUI Liping
- Subjects
carbon fiber ,co3o4 ,poor/rich electronic center ,2, 4-dichlorophenol ,catalytic degradation ,Chemical engineering ,TP155-156 ,Materials of engineering and construction. Mechanics of materials ,TA401-492 ,Technology - Abstract
Purposes Rapid industrial development has led to increased levels of chlorophenolic pollutants in water bodies, which poses threats to ecosystems and human survival. Methods In order to efficiently degrade the refractory contaminant 2, 4-dichlorophenol (2, 4-DCP) in industrial wastewater, a Co3O4-coated carbon fiber catalyst (Co3O4@CF) with poor/rich electron-active centers was prepared by one-step impregnation method, and applied to the study of activated persulfate degradation of 2, 4-DCP. Findings The results show that Co3O4 is uniformly coated on the surface of carbon fibers with regular skeleton structure, and electron-rich cobalt centers and electron-poor carbon centers are formed under the Co(Ⅱ)-π interactions. Under the initial conditions of pH 3.0~7.8, 2, 4-DCP mass concentration of 50 mg/L, Co3O4@CF mass concentration of 0.1 g/L, and PMS concentration of 10 mmol/L, the complete degradation of 2, 4-DCP is achieved by Co3O4@CF within 20 min. During the process, Co3O4@CF can induce the transfer of electrons from electron-poor to electron-rich centers in the reaction system to achieve rapid reduction of Co3+ and rapid activation of PMS. The characterization results further demonstrate that carbon fibers can not only at as carriers, but also participate in the PMS activated chain radical reaction through their structural defects, thus promoting the conversion of SO4-· to 1O2 and O2-· for the efficient degradation of 2, 4-DCP. more...
- Published
- 2024
- Full Text
- View/download PDF
30. Garlic Cellulosic Powders with Immobilized AgO and CuO Nanoparticles: Preparation, Characterization of the Nanocomposites, and Application to the Catalytic Degradation of Azo Dyes.
- Author
-
Sebeia, Nouha, Jabli, Mahjoub, and Sonsudin, Faridah
- Subjects
- *
AZO dyes , *NANOPARTICLES , *NANOCOMPOSITE materials , *GARLIC , *COPPER oxide , *COPPER powder , *POWDERS - Abstract
Nanomaterials have attracted specific consideration due to their specific characteristics and uses in several promising fields. In the present study, Chondrilla juncea was employed as a biological extract to facilitate the reduction of copper and silver ions within garlic peel powders. The resulting garlic-CuO and garlic-AgO nanocomposites were characterized using several analytical methods including FTIR, TGA/DTG, SEM, TEM, and XRD analyses. The garlic peel exhibited a rough surface. The nanoparticles were evenly dispersed across its surface. The incorporation of CuO and AgO nanoparticles affected the crystal structure of garlic peel. The establishment of CuO and AgO nanoparticles was evidenced by the highest residual mass values observed for the prepared nanocomposites. The thermogravimetric analysis showed that the prepared nanocomposites had lower thermal stability compared with garlic peel powders. The prepared nanocomposites were used for catalytic degradation of naphthol blue black B and calmagite. The decolorization process depended on the quantity of H2O2, initial concentration of azo dyes, duration of contact, and temperature of the bath. The calculated activation energy (Ea) values for the garlic-CuO nanocomposites were found to be 18.44 kJ mol−1 and 23.28 kJ mol−1 for calmagite and naphthol solutions, respectively. However, those calculated for garlic-AgO nanocomposites were found to be 50.01 kJ mol−1 and 12.44 kJ mol−1 for calmagite and naphthol, respectively. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
31. Synthesis of silver nanoparticles using Alchemilla vulgaris and Helichrysum arenarium for methylene blue and 4-nitrophenol degradation and antibacterial applications.
- Author
-
Kahraman, Havva Tutar
- Abstract
This study aimed to evaluate the concept of green synthesis of metallic nanoparticles (silver nanoparticles, AgNPs) by plant extracts without using any toxic or hazardous materials. Alchemilla vulgaris (AV) and Helichrysum arenarium (HA) are used as capping and reducing agents to synthesize AgNPs (as coded AV-AgNPs and HA-AgNPs). Both synthesized AgNPs were characterized by UV–visible spectrophotometry, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and transmission electron microscope (TEM). The results of characterization exhibited that AgNPs were successfully synthesized. They are highly well-dispersed, mostly spherical shape with an average size 15–20 nm. Catalytic reduction of methylene blue (MB) and 4-nitrophenol (4-NP) was assessed using synthesized AgNPs as nano-catalysts in the presence of NaBH
4 . The catalytic activity of the synthesized AgNPs revealed significant results in terms of degradation of MB and 4-NP to 4-AP (4-aminophenol). The reduction reactions of MB and 4-NP happen within 6–7 min using synthesized AV-AgNPs and HA-AgNPs in the presence of NaBH4 . According to the reusability analysis, synthesized AgNPs demonstrated excellent degradation performances by the more than 94% removal efficiency maintained after five reuse cycles. In addition, antibacterial activities of AgNPs were investigated against Escherichia coli (E. coli; Gram-negative bacteria) and Staphylococcus aureus (S. aureus; Gram-positive bacteria) by using quantitative well-diffusion method and the inhibition zones were determined using Mueller–Hinton agar (MHA) media. AV-AgNPs and HA-AgNPs showed strong antibacterial activities against E. coli with in inhibition zone diameters 25.5 and 25 mm, respectively. AV-AgNPs and HA-AgNPs were also extremely effective on S. aureus with high inhibition zone values of 22 and 24 mm, respectively. Finally, the fabricated silver nanoparticles could be excellent candidates for the separation of hazardous materials. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
32. Green, Low‐carbon Silk‐based Materials in Water Treatment: Current State and Future Trends.
- Author
-
Sun, Yuxu, Ma, Lantian, Wei, Tiancheng, Zheng, Meidan, Mao, Chuanbin, Yang, Mingying, and Shuai, Yajun
- Subjects
WATER purification ,WATER currents ,WATER reuse ,WASTEWATER treatment ,CARBON emissions ,WATER treatment plants ,WATER disinfection - Abstract
The improper and inadequate treatment of industrial, agricultural, and household wastewater exerts substantial pressure on the existing ecosystem and poses a serious threat to the health of both humans and animals. To address these issues, different types of materials have been employed to eradicate detrimental pollutants from wastewater and facilitate the reuse of water resources. Nevertheless, owing to the challenges associated with the degradation of these traditional materials post‐use and their incompatibility with the environment, natural biopolymers have garnered considerable interest. Silk protein, as a biomacromolecule, exhibits advantageous characteristics including environmental friendliness, low carbon emissions, biodegradability, sustainability, and biocompatibility. Considering recent research findings, this comprehensive review outlines the structure and properties of silk proteins and offers a detailed overview of the manufacturing techniques employed in the production of silk‐based materials (SBMs) spanning different forms. Furthermore, it conducts an in‐depth analysis of the state‐of‐the‐art SBMs for water treatment purposes, encompassing adsorption, catalysis, water disinfection, desalination, and biosensing. The review highlights the potential of SBMs in addressing the challenges of wastewater treatment and provides valuable insights into prospective avenues for further research. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
33. Nickel-doped magnetic carbon aerogel derived from xanthan gum: a competent catalyst for the degradation of single and binary dye-based water pollutants.
- Author
-
Mudgal, Deeksha, Yadav, Nisha, and Mishra, Vivek
- Subjects
XANTHAN gum ,WATER pollution ,AEROGELS ,DYE-sensitized solar cells ,ORGANIC dyes ,CONGO red (Staining dye) ,CATALYSTS - Abstract
Toxic organic dyes (colorants) are one of the main causes of water pollution that releases destructive effluents in the environment. To overcome this issue, a fundamental need to produce a novel, efficient catalyst for the degradation and mineralization of dye mixtures has arisen. The objective of this research is to develop an eminent Ni-doped magnetic carbon aerogel (Ni-MCA) catalyst using graft co-polymerization method having xanthan gum as backbone doped with Ni-magnetic nanoparticles (Ni-MNPs), that do not show agglomeration and easy to separate. The examination revealed that Ni-MCA provided exceptional magnetic characteristics (Ms = 52.75 emu/g) and potent catalytic activity for the degradation of mono- as well as binary-dye solutions of Congo red (CR) and methyl green (MG) dyes. The formation was verified by various characterization techniques such as FTIR, VSM, XRD, XPS, SEM, TEM, and EDX mapping. Interestingly, Ni-MCA shows faster result on anionic dye CR up to 97% with degradation rate of 5.647 × 10
−1 min−1 , and MG dye shows degradation of 95.7% with the degradation rate of 2.169 × 10−1 min−1 , while dye mixture is showing 90% degradation with rate of 2.159 × 10−1 min−1 . [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
34. Advantages and Disadvantages of PROTACs
- Author
-
Pujari, Rohini, Bhatt, Shvetank, Soni, Urvashi, Sharma, Shreya, Patil, Shubham, Nandave, Mukesh, editor, and Jain, Priti, editor
- Published
- 2024
- Full Text
- View/download PDF
35. Facile synthesis of ZnO nanoparticles using Nigella Sativa extract and its role as catalyst in production of bio-oil and degradation of methylene blue dye
- Author
-
Huma Jamil and Muhammad Faizan
- Subjects
Green synthesis ,ZnO NPs ,Pyrolysis ,Bio-oil ,Methylene blue ,Catalytic degradation ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Zinc Oxide (ZnO) nanoparticles (NPs) were synthesized using an environmentally benign biogenic approach employing an extract of kernels of Nigella Sativa (kalonji). The presence of primary and secondary metabolites in Nigella Sativa extract acted as the capping and reducing agent. The as-synthesized ZnO NPs were characterized using various advanced techniques i.e., UV, SEM, XRD, EDS, TGA, DSC, and FTIR spectra. UV characterization of ZnO NPs revealed a peak within the 350-400 cm−1 range, confirming their successful formation. XRD spectra revealed that the particles possess a nano-rods and platelets structure, with an average size of 65 nm. XRD analysis revealed that the particles possess a size of 65 nm with a nano-rods and platelets structure. FTIR spectra of the ZnO NPs exhibited a peak at a wavenumber range of 500–600 cm−1. The newly fabricated ZnO NPs were utilized in a pyrolysis reaction for the production of high-yield bio-oil, resulting in a maximum yield of 65.6 % at 350 °C. The spectra of the bio-oil display distinct peaks at 1340 cm−1, 2923.6 cm−1, and 1617 cm−1, which suggest the existence of phenolic and carbonyl chemicals. After incubating for 24 h under UV light, they also demonstrated significant catalytic degradation of methylene blue dye. The highest degradation was recorded to be an average of 71 % in 60 min of UV exposure. Taken together, ZnO NPs developed by eco-benign methods have the potential to be implemented as a novel catalytic system in the production of bio-oil as well as the remediation of dye-harboring industrial wastewater. more...
- Published
- 2024
- Full Text
- View/download PDF
36. Highly efficient catalytic degradation of organic dyes using iron nanoparticles synthesized with Vernonia Amygdalina leaf extract
- Author
-
Yohannes Shuka Jara, Tilahun Tumiso Mekiso, and Alemayhu Pawulos Washe
- Subjects
Catalytic degradation ,Characterization ,Iron nanoparticle ,Degradation efficiency ,Green synthesis ,Vernonia amygdalina ,Medicine ,Science - Abstract
Abstract Today, nanoscience explores the potential of nanoparticles due to their extraordinary properties compared to bulk materials. The synthesis of metal nanoparticles using plant extracts is a very promising method for environmental remediation, which gets global attention due to pollution-led global warming. In the present study, iron nanoparticles (FeNPs) were successfully synthesized by the green method using Vernonia amygdalina plant leaf extract as a natural reducing and capping agent. Biosynthesized FeNPs were characterized with different analytical techniques such as UV–visible, FT-IR, XRD, and SEM. The analysis revealed the formation of amorphous FeNPs with an irregular morphology and non-uniform distribution in size and shape. The average particle size was approximately 2.31 µm. According to the catalytic degradation investigation, the FeNPs produced via the green approach are highly effective in breaking down both CV and MB into non-toxic products, with a maximum degradation efficiency of 97.47% and 94.22%, respectively, when the right conditions are met. The kinetics study exhibited a high correlation coefficient close to unity (0.999) and (0.995) for the degradation of MB and CV, respectively, for the zero-order pseudo-kinetics model, which describes the model as highly suitable for the degradation of both dyes by FeNPs compared to other models. The reusability and stability of biosynthesized nano-catalysts were studied and successfully used as efficient catalysts with a slight decrease in the degradation rate more than four times. The results from this study illustrate that green synthesized FeNPs offer a cost-effective, environmentally friendly, and efficient means for the catalytic degradation of organic dyes. more...
- Published
- 2024
- Full Text
- View/download PDF
37. Strengthening mechanism of electrocatalytic properties of high activity Fe-based amorphous alloys by low escape work nanocrystals
- Author
-
Yaming Zhao, Qingjun Chen, Li Ji, Kan Wang, and Guosheng Huang
- Subjects
Amorphous alloy ,Nanocrystalline ,Electron work function ,Catalytic degradation ,Dye ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Amorphous alloy is a popular choice for wastewater treatment because of its high active sites and high catalytic performance. It is different from the previous situation that the degradation performance of amorphous materials decreases first and then increases after crystallization. The degradation efficiency of Direct Yellow GR dye (DYGR) by Electro-Fenton (E-F) is gradually increases as the amorphous content of Fe41Co7Cr15Mo14C15B6Y2 amorphous alloy powder (MGs) is reduced in this work. The in-situ precipitation of (Fe, Cr)23(C, B)6 and Fe7C3 nanocrystals was discovered to decrease the electron work function (EWF) of the alloy powder, thus decreasing the amount of work needed to escape electrons and enhancing the electrocatalytic performance of the material. At the same time, the precipitation of (Fe, Cr)23(C, B)6 nanocrystals changed the chemical composition of the surface of MGs. After annealing, the Fe2+ concentration was higher than before regression, and the chemical potential energy between Fe2+ and Fe3+ was greater, thus facilitating the formation of ∙OH. This research offers novel perspectives on the utilization of nanocrystals in the management of amorphous alloy wastewater. more...
- Published
- 2024
- Full Text
- View/download PDF
38. Effect of Nickel Impurities in Pyrite on Catalytic Degradation of Thiosulfate
- Author
-
Xuecong Qin, Tao Zhang, Wenhua Qin, and Hongbo Zhang
- Subjects
gold extraction ,thiosulfate ,nickel-bearing pyrite ,catalytic degradation ,Mining engineering. Metallurgy ,TN1-997 - Abstract
The effects of nickel content in nickel-bearing pyrite on photocatalytic properties, light absorption properties, and oxidative decomposition of thiosulfate were studied. The leaching experiments show that the consumption of thiosulfate in the Cu2+-ethylenediamine (en)-S2O32− system increases with an increase in nickel content in nickel-bearing pyrite. The consumption of Cu(en)22+ initially increases and then decreases with an increase in leaching time. There is a clear correlation between the change trend in its consumption and the doping amount of nickel in pyrite. The XPS results show that in the Cu2+-ethylenediamine (en)-S2O32− leaching gold system (temperature 25 °C, time 35 h, solution: 0.1 mol/L S2O32−, 5 mmol/L Cu(en)22+, 200 mL solution), the nickel of pyrite-containing nickel can be transferred to the leaching solution and becomes nickel ion. In this leaching system, Cu(II), which was originally complexed with en, is reduced to Cu(I) in a short time. The consumption of Cu(en)22+ increased rapidly in the 5 h period and then decreased gradually after 5 h. The results showed that the presence of free Ni2+ in the solution facilitated the conversion of bivalent copper ions to monovalent copper ions. Free Ni2+ ions can compete with Cu2+ ions for en ligands. When ethylenediamine complexes with Ni2+, the decomposition of Cu(en)22+ into Cu(en)+ and en occurs more rapidly. And the en, which was originally to be oxidized with Cu(en)+ to form Cu(en)22+, forms Ni(en)22+. As a result, the concentration of Cu(en)22+ continues to decrease in a short period of time. more...
- Published
- 2024
- Full Text
- View/download PDF
39. Singlet oxygen-dominated non-radical oxidation pathway for 2,4-Dichlorophenol degradation over CeO2 coated carbon fibers
- Author
-
Wei, Yuexing, Li, Linyu, Fang, Bin, He, Ziyue, Zhang, Jiansheng, Zhang, Yuxun, Qin, Yuhong, and He, Chong
- Published
- 2024
- Full Text
- View/download PDF
40. Highly efficient catalytic degradation of organic dyes using iron nanoparticles synthesized with Vernonia Amygdalina leaf extract
- Author
-
Jara, Yohannes Shuka, Mekiso, Tilahun Tumiso, and Washe, Alemayhu Pawulos
- Published
- 2024
- Full Text
- View/download PDF
41. Amorphous-nanocrystalline dual-phase structured Fe78Si13B9 alloy ribbons and their efficiency for degradation of direct yellow dye.
- Author
-
Zhao, Yaming, Chen, Qingjun, Ji, Li, Wang, Kan, and Huang, Guosheng
- Abstract
In this study, the amorphous-nanocrystalline dual-phase structure Fe
78 Si13 B9 alloy ribbons (FeSiB) were prepared by single roll stripping method. The degradation efficiency of FeSiB for direct yellow dyes (DYGR) was 83% at a water bath temperature of 35 °C, pH = 7, and without any oxidizer addition. The characterization results show that the galvanic cell structure is formed between the nanocrystals and amorphous matrix, which makes it easier for Fe0 to lose electrons and accelerate electron transfer, thus promoting the degradation reaction. Ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS) was employed to identify the intermediates. The specific degradation pathway of DYGR by FeSiB ribbons is proposed for the first time based on these 18 intermediates. The mechanism studies show that [H] produced by FeSiB plays a special role in the degradation pathway of DYGR, and is more likely to react with electron-withdrawing group. This work provides a new idea for understanding the degradation mechanism of azo dyes by Fe-based alloys. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
42. Bimetallic Mn-Ce loaded on different zeolite carriers applied in the toluene abatement in air by non-thermal plasma DDBD reactor.
- Author
-
Liu, Su, Zhou, Jiabin, Liu, Dan, Liu, Xianjie, and Liu, Wenbo
- Subjects
NON-thermal plasmas ,ZEOLITES ,TOLUENE ,CATALYST supports ,PLASMA potentials ,METALS - Abstract
A sequence of zeolite carriers (Carrier = ZSM-5, Small crystal ZSM-5, MCM-41, SBA-15) were used to support active metals Mn-Ce, which have presented an enormous potential for plasma oxidation of toluene in air. The prepared samples were detected by means of N
2 adsorption–desorption, SEM, XPS, H2 -TPR, etc. Through the activity evaluation in the Non-thermal Plasma Reactor, we found that the catalysts with different carriers showed distinct degradation activities. The performance of mesoporous supported catalysts was better than that of microporous catalysts, of which MCM-41 performed best. 96.3% of toluene can be decomposed, and 97.3% of degraded toluene converted into final products CO2 completely at the initial concentration of 1000 ppm and SIE of 9 kJ/L. From the results, we can see that the appropriate carrier is conducive to maximizing the efficiency of the active metal, and Mn-Ce/MCM-41 got the best performance in the plasma catalysis for toluene abatement. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
43. Immobilizing palladium nanoparticles in beta-cyclodextrin-grafted graphene oxide modified polyvinylidene fluoride mixed matrix membranes for the removal of anionic azo dyes.
- Author
-
Ndlovu, Lloyd N., Ndlwana, Lwazi, Mishra, Ajay K., Nxumalo, Edward N., and Mishra, Shivani B.
- Subjects
- *
AZO dyes , *POLYVINYLIDENE fluoride , *GRAPHENE oxide , *CONGO red (Staining dye) , *PALLADIUM , *NANOPARTICLES , *MEMBRANE separation - Abstract
Herein, we report on a facile synthetic method for the fabrication of novel sets of polyvinylidene fluoride (PVDF) mixed matrix membranes (MMMs) modified with beta cyclodextrin (β –CD) grafted graphene oxide (GO) and palladium (Pd) for degradation, adsorption, and filtration of anionic azo dyes (Congo red and methyl orange). The fabricated membranes were designated PVDF/ β –CD-g-GO and PVDF/ β –CD-g-GO-Pd which were then characterized using several analytical instrumentation. The results indicated that the new PVDF-based membranes were successfully modified. However, the chosen modification did not greatly change membrane properties. The in-situ synthesized Pd nanoparticles (NPs) presented uniform size averaging at 8.31 nm. The leaching of these NPs was also interrogated at different pH values, showing a leaching rates of as low as 0.66 μg m−2 h−1 at pH 7. Scanning electron and Raman microscopies also indicated a good dispersion of the modifiers within the membrane. Additionally, the MMMs indicated a dense microstructure as compared to the spongy structure of the pristine. The adsorption capacity and separation of the dyes by the membranes were both enhanced by up to 100%. The recyclability of the MMMs was improved where the degradation was maintained at 94.6% and 97.2% for Congo red and methyl orange, respectively. As such, the novel membranes present great potential for the application in textile wastewater treatment. [Display omitted] • PVDF/ β –CD- g -GO-Pd catalytic mixed matrix membranes were successfully fabricated. • Pd nanoparticles were in-situ generated in membrane matrix. • The catalytic membranes efficiently degraded azo dyes. • The catalytic membrane was highly reusable towards degradation of azo dyes. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
44. Iron–doped bismuth oxybromides as visible−light−responsive Fenton catalysts for the degradation of atrazine in aqueous phases.
- Author
-
Cai, Yong-Li, Xu, Yu-Hang, Xiang, Ji-Zun, Zhang, Zhi-Qiang, He, Qiu-Xiang, Li, Ya-Feng, and Lü, Jian
- Subjects
- *
ATRAZINE , *ORGANIC water pollutants , *BISMUTH , *EMERGING contaminants , *DOPING agents (Chemistry) , *CATALYSTS , *POLLUTANTS - Abstract
• A photo–Fenton system was constructed with iron–doped bismuth oxybromides (Fe–BiOBr). • Fe–BiOBr displayed superior photo–Fenton activity towards atrazine degradation. • Atrazine degradation intermediates and pathways were revealed. Pesticides and its degradation products, being well–known residues in soil, have recently been detected in many water bodies as pollutants of emerging concerns, and thus there is a contemporary demand to develop viable and cost–effective techniques for the removal of related organic pollutants in aqueous phases. Herein, a visible−light−responsive Fenton system was constructed with iron–doped bismuth oxybromides (Fe–BiOBr) as the catalysts. Taking the advantage of sustainable Fe(III)/Fe(II) conversion and optimized H 2 O 2 utilization, the optimal Fe–BiOBr–2 catalyst showed an excellent atrazine removal efficiency of 97.61% in 120 min, which is superior than the traditional homogeneous Fenton and the majority of heterogeneous processes documented in the literature. In this photo–Fenton system, hydroxyl (·OH) and superoxide (·O 2 –) radicals were dominant active species contributed to the oxidative degradation of atrazine. Due to the production of various active radicals, five degradation pathways were proposed based on the identification of intermediates and degradation products. Overall, this work not only demonstrates a fundamental insight into creating highly efficient and atom economic photo−Fenton systems, but also provides a complementary strategy for the treatment of organic pollutants in water. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
45. MOF复合材料催化氧化降解水中污染物迸展.
- Author
-
丁开, 尹理亚, 刘美淇, 芦天亮, 王剑峰, and 韩丽
- Abstract
The application of metal-organic frameworks(MOFs) composites in water pollution treatment in recent years was reviewed, and the research progress of MOF composites combined with different advanced oxidation technologies (photocatalytic oxidation, ozonation, Fenton and Fenton-like processes, activated persulfate) was systematically introduced・ The advantages of MOF composites compared with single MOF materials in water pollution treatment are summarized, and the challenges still facing the future application of MOF composites are put forward. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
46. Recent Advances in Synthesis of AgNPs and Their Role in Degradation of Organic Dyes.
- Author
-
Rani, Gita, Bala, Anu, Ahlawat, Rachna, Nunach, Amit, and Chahar, Suman
- Abstract
Green technology is gaining importance nowadays, it has become very important to synthesize various nanoparticles. This review mainly focuses on the phytosynthesis of silver nanoparticles (AgNPs) and shows their catalytic applications in the field of wastewater treatment. Plant-assisted synthesis of AgNPs has been documented by numerous studies. Plant-mediated synthesis has many advantages over conventional methods and is discussed comprehensively in this review. This critical review aims to help researchers to better understand and follow this rapid, cost-effective, and eco-friendly research area. Dye effluents in water bodies become a major environmental issue worldwide. This paper also offers a thorough understanding of the synthetic dyes such as Rhodamine B, Methylene Blue, Crystal violet, Methyl Orange, and Amido black 10B used in the textile industry, with a focus on the popular methods to degrade them from industrial wastewater, especially, chemical degradation, and photocatalytic dye degradation using silver nanoparticles and other Ag-systems. Additionally, the plausible mechanism involved in chemical and photocatalytic degradation was also provided. There are several review articles on all these topics, but such an in-depth study has not been investigated so far in the concerned research literature. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
47. Biogenic synthesis of Bi2O3 nanoparticles using Cassia fistula plant pod extract for the effective degradation of organic dyes in aqueous medium.
- Author
-
Meena, Parmeshwar Lal, Surela, Ajay Kumar, Poswal, Krishna, Saini, Jitendra Kumar, and Chhachhia, Lata Kumari
- Abstract
In the current study Bi
2 O3 nanoparticles (NPs) were prepared using Cassia fistula plant pod extract and the photocatalytic potential of the as-prepared Bi2 O3 NPs was investigated against the degradation of Alizarin Red S (ARS) under visible light irradiation, while the catalytic efficiency was evaluated for the reduction of methylene blue (MB) and rhodamine B (RhB) dyes. The as-prepared nanoparticles were characterized by XRD, FESEM-EDS, HRTEM, UV–Vis, FTIR, and Raman spectroscopic techniques. The XRD and Raman analysis revealed the presence of γ- phase of Bi2 O3 predominantly along with α-phase. The average particle size was calculated to be 63.16 nm from the XRD analysis and further confirmed by the FESEM and HRTEM analysis. Moreover, the bandgap was calculated to be 2.25 eV. The highest 99.25% degradation of the ARS dye was observed at pH = 2, while it was 98% at pH = 10 under visible light irradiation. Similarly, UV–Vis absorption measurements proved that MB and RhB dyes were almost completely reduced by NaBH4 in the presence of Bi2 O3 NPs. The photostability of the catalyst was accessed by its successive use in five runs of cycles for the degradation of ARS dye. Even after four runs of use, the photocatalyst was found to be efficient with 92% degradation performance in the fifth cycle. The radical scavenger experiments reveal that electrons (e− ) and superoxide radicals (•O2 − ) are the key active species involved in the photocatalytic degradation of ARS dye over Bi2 O3 NP. Moreover, the kinetic aspects of the photocatalytic degradation process have also been discussed in the present study. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
48. Manganese dioxide-coated biocarbon for integrated adsorption-photocatalytic degradation of formaldehyde in indoor conditions
- Author
-
Mariem Zouari, Silvo Hribernik, Laetitia Marrot, Marian Tzolov, and David B. DeVallance
- Subjects
Biocarbon ,Manganese dioxide ,Catalytic degradation ,Functional coating ,Built environment ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Formaldehyde is a common indoor air pollutant with hazardous effects on human health. This study investigated the efficiency of biocarbon (BC) functionalized with variable contents of MnO2 for formaldehyde removal in ambient conditions via integrated adsorption-photocatalytic degradation technology. The sample with the highest formaldehyde removal potential was used to prepare a functional coating made of acrylic binder mixed with 20 wt% of the particles and applied on beech (Fagus sylvatica L) substrate. SEM images showed that MnO2 was deposited around and inside the pores of the BC. EDX spectra indicated the presence of Mn peaks and increased content of oxygen in the doped BC compared to pure BC, which indicated the successful formation of MnO2. Raman spectra revealed that the disorder in the BC's structure increased with increasing MnO2 loadings. FTIR spectra of BC–MnO2 samples displayed additional peaks compared to the BC spectrum, which were attributed to MnO vibrations. Moreover, the deposition of increased MnO2 loadings decreased the porosity of the BC due to pores blockage. The BC sample containing 8 % Mn exhibited the highest formaldehyde removal efficiency in 8 h, which was 91 %. A synergetic effect between BC and MnO2 was observed. The formaldehyde removal efficiency and capacity of the coating reached 43 % and 6.1 mg/m2, respectively, suggesting that the developed coating can be potentially used to improve air quality in the built environment. more...
- Published
- 2024
- Full Text
- View/download PDF
49. Two-dimensional MXenes for toxin management: Advanced electrocatalytic detection, degradation, and adsorption dynamics
- Author
-
Sakthivel Kogularasu, Yung-Lung Chen, Yen-Yi Lee, Bo-Wun Huang, Perumal Murugesan, Guo-Ping Chang-Chien, and Mani Govindasamy
- Subjects
MXenes ,Toxin control ,Electrochemical sensors ,Catalytic degradation ,Membrane adsorption ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
Environmental toxins threaten human health and ecosystem integrity, necessitating advanced detection, degradation, and removal methodologies. In recent years, the scientific community has increasingly focused on MXenes, a novel class of two-dimensional (2D) transition metal carbides, nitrides, and carbonitrides, due to their exceptional potential in toxin management. This comprehensive review thoroughly examines MXenes, including synthesis methods, structural and chemical properties, and functionalization strategies. Unique to this review is the integrated discussion of MXenes in the context of environmental toxin management, encompassing detection, degradation, and removal within a single study. The enhancement of sensor technologies using MXenes for rapid and precise toxin detection is thoroughly analyzed. It focuses on MXene-mediated degradation pathways, especially photocatalytic and electrocatalytic mechanisms, considering their redox potential and light-harvesting capabilities. Additionally, the adsorption dynamics of MXene-based adsorbents are scrutinized, covering adsorption capacity, kinetics, and regeneration/recyclability. The review offers a comparative evaluation of MXenes with other 2D materials, positioning MXenes within the broader context of toxin management solutions. This article stands out for its novel and comprehensive approach, being the first to concurrently address the detection, degradation, and removal of environmental toxins using MXenes. The review concludes by underscoring the vast potential of MXenes in addressing environmental toxins. It emphasizes the urgent need for continued research to optimize their performance, scale up production, and enable practical implementation. This detailed reference aims to serve researchers and practitioners in environmental management, guiding future innovations and applications of MXenes in toxin control. more...
- Published
- 2024
- Full Text
- View/download PDF
50. Catalytic degradation of diverse azo dyes using Eucommia ulmoides bark-mediated gold nanocatalyst
- Author
-
Hong Wan, Sania Habib, Huihong Liu, and Sakil Mahmud
- Subjects
Gold nanoparticles ,Eucommia ulmoides ,Azo dyes ,Catalytic degradation ,Competitive analysis ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
In the absence of any hazardous substances, colloidal gold nanoparticles (AuNPs) were synthesized through the reduction and stabilization of corresponding metal cations by a simple Eucommia ulmoides bark extract (EUBE). Employing these AuNPs as catalysts, at least ten distinct azo compounds were catalyzed and analyzed. The findings reveal outstanding catalytic performance across a diverse range of azo dyes, regardless of structural complexity, the count of azo bonds, the presence of various functional groups in the side chains, differences in molecular weight, degrees of water solubility, ionic characteristics of the dyes, and the particular class of dyes, whether reactive or acidic. Regardless of these varieties, azo dyes achieved over 90% degradation within 16 min, following a first-order pseudo-kinetic reaction. This report systematically explains the mechanics of AuNPs synthesis using EUBE and the step-by-step azo dye degradation. It signifies an advancement in azo-contaminated wastewater treatment, transcending the varied types and structural complexities of azo compounds. more...
- Published
- 2024
- Full Text
- View/download PDF
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.