192 results on '"Ma, Hongrui"'
Search Results
152. Speciation and phytoavailability of heavy metals in sediments in Nanjing section of Changjiang River
- Author
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Ma, Hongrui, primary, Hua, Li, additional, and Ji, Junfeng, additional
- Published
- 2010
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153. Quantitative planar laser-induced fluorescence imaging of multi-component fuel/air mixing in a firing gasoline-direct-injection engine: Effects of residual exhaust gas on quantitative PLIF
- Author
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Williams, Ben, primary, Ewart, Paul, additional, Wang, Xiaowei, additional, Stone, Richard, additional, Ma, Hongrui, additional, Walmsley, Harold, additional, Cracknell, Roger, additional, Stevens, Robert, additional, Richardson, David, additional, Fu, Huiyu, additional, and Wallace, Stan, additional
- Published
- 2010
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154. Concentration and distribution characteristic of main toxic metals in suspended particle material in Nanjing reach, Changjiang River
- Author
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Hua, Li, primary, Ma, Hongrui, additional, and Ji, Junfeng, additional
- Published
- 2010
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155. Multi-Component Quantitative PLIF: Robust Engineering Measurements of Cyclic Variation in a Firing Spray-Guided Gasoline Direct Injection Engine
- Author
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Williams, Ben, primary, Ewart, Paul, additional, Stone, Richard, additional, Ma, Hongrui, additional, Walmsley, Harold, additional, Cracknell, Roger, additional, Stevens, Robert, additional, Richardson, David, additional, Qiao, Jun, additional, and Wallace, Stan, additional
- Published
- 2008
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156. Adsorptive removal of vinyl polymer/ZnO nanocomposite from aqueous solution by activated sludge biomass.
- Author
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Zhao, Xia, Ma, Hongrui, Ma, Jianzhong, Gao, Dangge, Hu, Lizhen, and Lv, Xiangfei
- Subjects
AQUEOUS solutions ,VINYL polymers ,ZINC oxide ,ACTIVATED sludge process ,ADSORPTION (Chemistry) - Abstract
In this study, the removal potential of vinyl polymer/ZnO nanocomposite (PDM/ZnO) by activated sludge (AS) biomass was investigated. PDM/ZnO was effectively removed by AS adsorption (90.3% of total PDM/ZnO removed). The effects of contact time, temperature, pH of the solution, PDM/ZnO production method, initial adsorbate concentration, and properties of the adsorbent were studied. The experimental results are fitted with the Langmuir and Freundlich equations. The adsorption kinetics closely followed the pseudo-second-order model. Thermodynamic parameters (ΔH°, ΔS°, ΔG°) indicate that the adsorption of PDM/ZnO onto AS was feasible, spontaneous, and endothermic. The effects of PDM/ZnO production method and pH value both indicate that electrostatic force may main mechanism in PDM/ZnO adsorption process. The decrease in the adsorption capacity of inactivated sludge suggests that the increase of adsorbent surface area also plays a significant role in the removal process. [ABSTRACT FROM PUBLISHER]
- Published
- 2015
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157. Effect of biochar on carbon dioxide release, organic carbon accumulation, and aggregation of soil.
- Author
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Hua, Li, Lu, Zhaoqing, Ma, Hongrui, and Jin, Susu
- Subjects
CARBON dioxide ,BIOCHAR ,CARBON sequestration ,CLUSTERING of particles ,ORGANIC compounds ,SOILS - Abstract
The potential carbon sequestration ability of biochar was investigated. The results indicated the amendment of biochar to soil could reduce the CO
2 emission and increase the organic matter of soil effectively. The influence extent enhanced as the increase of biochar and the influence extent on soil with lower organic matter content is much obvious than soil with higher organic matter content. After incubated 7 months, soil CO2 emission was suppressed significantly by the amendment of biochar. The CO2 release amount in soils with 8% biochar decreased 29%∼39% compared with control. Organic matter content in soils with 8% biochar increased 41%∼75%. In addition, biochar promoted the formation of soil aggregates. Mean weight diameter of micro-aggregates in soils with biochar increased obviously compared with the control, indicating that stability of soil aggregates improved as the increase of biochar. The research demonstrated that biochar had potential ability on soil carbon sequestration, which was realized by enhance organic matter content, suppressing CO2 release and improving micro-structure characteristic of soil. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 941-946, 2014 [ABSTRACT FROM AUTHOR]- Published
- 2014
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158. In-Cylinder Temperature Estimation from an Optical Spray-Guided DISI Engine with Color-Ratio Pyrometry (CRP)
- Author
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Ma, Hongrui, primary, Stevens, Robert, additional, and Stone, Richard, additional
- Published
- 2006
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159. Study on Characteristics of Cr(III) Removal by Fly Ash in Aqueous Solution.
- Author
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Fan Chunhui, Ma Hongrui, and Dang Nan
- Published
- 2011
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160. Cr(III) accumulation and phytoavailability in alkaline soils contaminated by tannery sludge
- Author
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Ma, Hongrui, primary, Wang, Xiaorong, additional, and Zhang, Chuanbo, additional
- Published
- 2003
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161. Synergistic immobilization of Cr from real tannery sludge by formation of spinel phases with TiO2and ZnO
- Author
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Yang, Yonglin, Zhu, Chao, Wang, Heyou, Hao, Yongyong, Yan, Long, Zhang, Zhifang, Yan, Haijun, Chen, Xiangping, and Ma, Hongrui
- Abstract
With the rapid development of tanning industry, a noticeable number of chromium-containing tannery sludge (Cr-ITS) has been produced, which poses an impending threat to ecosystem and human health, and needs special disposal ahead of landfilling. In this study, an alternative method for thermally stabilizing Cr-ITS via employing ZnO and TiO2as dopants was developed. Oxidation of Cr(III), competitive formation of Cr-spinel, immobilization of Cr, and leaching toxicity of sintered products were investigated during Cr-ITS thermal treatment at the temperature range of 800–1200 ℃. Cr in Cr-ITS could be immobilized effectively through transforming Cr into spinel structure, as demonstrated by XRD analysis. Thus, the toxic Cr-ITS would be remedied and detoxified. Co-doping of ZnO and TiO2not only noticeable inhibited oxidation of Cr(III), but also accelerated conversion of Cr(III) to spinel dominated by ZnCr2O4. Increasing temperature was conducive to the formation of spinel. Most of Cr were incorporated into spinel phase when thermal treatment temperature was over 1000 ℃, where Cr(VI) leached was not detected, and leaching concentrations of Cr and Zn after prolonged leaching time of 25 d were 13.32 mg/L and 23.07 mg/L respectively, which all meet regulatory limits. When increasing temperature to 1100 ℃, their leaching risk was further reduced to 4.39 mg/L and 5.24 mg/L respectively, successfully achieving simultaneous stabilization of heavy metals. The overall results indicate that Cr-ITS immobilized with ZnO and TiO2is a promising and feasible strategy by incorporating Cr into spinel phases using sintering temperature reached in ceramic industry.
- Published
- 2022
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162. Degradation process analysis of the azo dyes by catalytic wet air oxidation with catalyst CuO/γ-Al2O3
- Author
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Hua, Li, Ma, Hongrui, and Zhang, Lei
- Subjects
- *
AZO dyes , *COPPER oxide , *METAL catalysts , *ALUMINUM oxide , *OXIDATION , *BIODEGRADATION , *CHEMICAL processes , *CHEMICAL oxygen demand - Abstract
Abstract: Three azo dyes (Methyl Orange, Direct Brown and Direct Green) were treated by catalytic wet air oxidation (CWAO) with the catalysts CuO/γ-Al2O3 prepared by consecutive impregnation. The relationship of decolorization extent, chemical oxygen demand (COD) removal extent and total organic carbon (TOC) in dye solution were investigated. The results indicated that the CuO/γ-Al2O3 catalyst had excellent catalytic activity in treating azo dyes. Almost 99% of color and 70% of TOC were removed in 2h. The high removal extent of color and TOC indicated that the CWAO obtained perfect decomposition for pollutants. The degradation pathway of azo dyes was analyzed by UV–Vis, FTIR and MS. According to the examined results, the hydroxyl ( OH) radicals induced strong oxidizing effects in the target solution and destroyed the chromophoric groups of azo-benzene conjugated of the molecular structure. Considering characteristics of the dye structure, the azo bond (h name="dbnd" />Nirst be attacked by the hydroxyl radical and other free radicals. With the continuous oxidization and the long reaction time at high temperature, these intermediates could be oxidized to the final oxidation products, such as water and carbon dioxide. [Copyright &y& Elsevier]
- Published
- 2013
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163. Well-to-wake energy and greenhouse gas analysis of SO X abatement options for the marine industry
- Author
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Ma, Hongrui, Steernberg, Koen, Riera-Palou, Xavier, and Tait, Nigel
- Subjects
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SHIPPING companies , *GREENHOUSE gas mitigation , *ENERGY consumption , *MARITIME shipping , *HEAVY oil as fuel , *SULFUR content in petroleum fuel , *SENSITIVITY analysis , *PETROLEUM refineries - Abstract
Abstract: This paper investigates the well-to-wake energy consumption and greenhouse gas emissions of several key SO X abatement options in marine transportation, ranging from the manufacture of low sulfur fuels to equipping the vessel with suitable scrubber solutions. The findings suggest that a scrubber system, used with current heavy fuel oils, has the potential to reduce SO X emissions with lower well-to-wake energy consumption and greenhouse gas emissions than switching to production of low sulfur fuels at the refinery. A sensitivity analysis covering a series of system parameters shows that variations in the well-to-tank greenhouse gas emissions intensity and the energy efficiency of the main engine have the highest impacts in terms of well-to-wake emissions. [Copyright &y& Elsevier]
- Published
- 2012
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164. Speciation of Cd and its relationship with the bioaccumulation of Corbicula fluminea in the sediments of Lake Taihu
- Author
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Ren, Jinghua, Ma, Hongrui, Wang, Xiaorong, Geng, Jinju, and Xueyuan Gu
165. Electrochemical Treatment of Synthetic Wastewaters Contaminated by Organic Pollutants at Ti 4 O 7 Anode. Study of the Role of Operative Parameters by Experimental Results and Theoretical Modelling
- Author
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Yongyong Hao, Pengfei Ma, Hongrui Ma, Federica Proietto, Claudia Prestigiacomo, Alessandro Galia, Onofrio Scialdone, and Yongyong Hao, Pengfei Ma, Hongrui Ma, Federica Proietto, Claudia Prestigiacomo, Alessandro Galia, Onofrio Scialdone
- Subjects
Anodic Oxidation • BDD • Ti4O7 • Toxic organic compounds • wastewater treatment ,Electrochemistry ,Settore ING-IND/27 - Chimica Industriale E Tecnologica ,Catalysis - Abstract
In the last years, an increasing attention has been devoted to the utilization of anodic oxidation (AO) technologies for the treatment of wastewater polluted by recalcitrant organics. Recently, Ti4O7 was proposed as a promising anode for AO for the treatment of various organics. Here the potential utilization of commercial Ti4O7 anodes has been evaluated considering the electrochemical treatment of synthetic wastewater contaminated by three very different organic molecules (namely, oxalic acid, phenol and Acid Orange 7), all characterized by a very high resistance to AO. The performances of Ti4O7 were compared with that of two largely investigated anodes: Boron-doped diamond (BDD), which is probably the most effective electrode for AO, and an Ir-based anode which presents a relatively low cost. Moreover, the effect of various operative conditions (current density, mixing rate and initial concentration of the organic) was evaluated by both experimental studies and the adoption of a theoretical model previously developed for BDD anodes. It was shown that the performances of the process can be improved by a proper selection of operative conditions. Moreover, it was found that the proposed model can be effectively used to predict the effect of operative parameters at Ti4O7 anodes, thus helping the process optimization.
- Published
- 2022
166. Electrochemical treatment of real wastewater. Part 1: Effluents with low conductivity
- Author
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Hongrui Ma, Pengfei Ma, Simona Sabatino, Onofrio Scialdone, Alessandro Galia, Ma, Pengfei, Ma, Hongrui, Sabatino, Simona, Galia, Alessandro, and Scialdone, Onofrio
- Subjects
Materials science ,Supporting electrolyte ,General Chemical Engineering ,Sodium ,chemistry.chemical_element ,02 engineering and technology ,Wastewater treatment ,010501 environmental sciences ,Conductivity ,Electrochemistry ,01 natural sciences ,Industrial and Manufacturing Engineering ,Low conductivity ,Environmental Chemistry ,Chemical Engineering (all) ,Micro reactor ,Effluent ,0105 earth and related environmental sciences ,Boron doped diamond ,Waste management ,Anodic oxidation ,Chemistry (all) ,General Chemistry ,021001 nanoscience & nanotechnology ,Real wastewater ,Electrochemical oxidation ,Wastewater ,Chemical engineering ,chemistry ,0210 nano-technology - Abstract
The treatment of a real wastewater characterized by low conductivity was performed by anodic oxidation at boron doped diamond (BDD) in both conventional and microfluidic cells. The electrolyses carried out in conventional cells without supporting electrolyte were characterized by very high TOC removals but excessively high energetic consumptions and operating costs. The addition of sodium sulphate, as supporting electrolyte, allowed to strongly reduce the cell potentials and consequently the energetic consumptions and the operating costs. However, under various operating conditions, the addition of Na2SO4 caused a lower removal of the TOC. The best results in terms of both TOC removal, energetic consumptions and operating costs (about 1 €/m3) were obtained using a cell with a very low inter-electrode distance (50 µm) with no addition of a supporting electrolyte.
- Published
- 2018
167. Gradient and facile extraction of valuable metals from spent lithium ion batteries for new cathode materials re-fabrication.
- Author
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Chen, Xiangping, Kang, Duozhi, Li, Jiazhu, Zhou, Tao, and Ma, Hongrui
- Subjects
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STORAGE batteries , *LITHIUM-ion batteries , *METALS , *CATHODES , *TRANSITION metals , *METAL recycling , *MATERIALS , *TARTARIC acid - Abstract
• Stoichiometric ratios of acids are used for Li and transition metals leaching. • Dilute tartaric acid shows high selectivity towards Li. • Transition metals can be completely dissolved in dilute sulfuric acid. • NCM cathode materials can be re-fabricated from the obtained products. • A closed-loop process with high selectivity and efficiency is established. Sustainable recycling value-added metals from spent lithium-ion batteries (LIBs) has been supposed to be a promising alternative to alleviate the current environmental and resource issues. Reduced reagents consumption and closed-loop reutilization are still challenging in current prevailing recycling processes. This study proposed a novel recycling strategy involved with gradient extraction of valuable metals and closed-loop re-fabrication of cathode materials. Lithium was selectively recovered as lithium enriched lixivium in mild tartaric acidic medium with a high yield of 99.7 % and little co-extraction of transition metals (Ni, Co and Mn) under optimized leaching conditions. Then transition metals enriched residues can be completely dissolved in facile sulfuric acidic medium without the contamination of Li. Li 2 CO 3 and ternary precursors were recovered from Li enriched lixivium and transition metal enriched lixivium, respectively. Finally, cathode materials of LiNi 1/3 Co 1/3 Mn 1/3 O 2 are refabricated using obtained products to close the recycling loop. It can be concluded that it is possible for the gradient recycling of Li and transition metals based on their inherent properties with minimized consumption of acids under facile leaching conditions, which can also facilitate metals separation process for closed-looped re-fabrication of new cathode materials. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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168. Dabigatran etexilate versus warfarin in cerebral venous thrombosis in Chinese patients (CHOICE-CVT): An open-label, randomized controlled trial.
- Author
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Ma H, Gu Y, Bian T, Song H, Liu Z, Ji X, and Duan J
- Subjects
- Humans, Male, Female, Middle Aged, Adult, Aged, China epidemiology, Hemorrhage chemically induced, Antithrombins therapeutic use, Antithrombins adverse effects, Young Adult, Adolescent, Treatment Outcome, Aged, 80 and over, East Asian People, Dabigatran therapeutic use, Dabigatran adverse effects, Warfarin therapeutic use, Warfarin adverse effects, Venous Thrombosis drug therapy, Anticoagulants therapeutic use, Anticoagulants adverse effects, Intracranial Thrombosis drug therapy
- Abstract
Background: The efficacy and safety of dabigatran etexilate for Chinese patients with cerebral venous thrombosis (CVT) has not been well established., Methods: CHOICE-CVT was an exploratory, single-center, randomized, open-label study in the National Center for Neurological Disorders involving Chinese patients with CVT aged 18 to 80 years who were randomly assigned (1:1) to either dabigatran etexilate or warfarin. Oral anticoagulants were initiated after 10-15 days of LMWH. The primary efficacy and safety endpoints included the number of patients with recurrent CVT and/or deep venous thrombosis (DVT) and major clinical bleeding within 180 days. Secondary efficacy endpoints included venous recanalization and change in papilledema at day 180. Secondary safety outcomes comprised death, clinical nonmajor bleeding, and any bleeding. The study was registered with ClinicalTrials.gov under NCT03930940., Results: Between October 2017 and February 2023, a total of 89 patients were enrolled and randomly assigned to receive either dabigatran etexilate (n = 44) or warfarin (n = 45). At day 180, the dabigatran etexilate group showed a statistically nonsignificant but likely clinically significant number of patients with recurrent CVT and/or DVT (8 (18.2%; 95% CI, 6.3-30.0) vs 3 (6.7%; 95% CI, 0.0-14.2), p = 0.099, with a power (1-β) of 38.401%) compared with the warfarin group. The dabigatran etexilate group showed a comparable number of patients with clinical major bleeding (0 (0) vs 0 (0) p = 1.000), and clinical nonmajor bleeding (1 (2.3%; 95% CI, 0.0-6.9) vs 1 (2.2%; 95% CI, 0.0-6.7)) but demonstrated a lower risk of any bleeding (1 (2.3%; 95% CI, 0.0-6.9) vs 9 (20.0%; 95% CI, 7.8-32.2)) compared with the warfarin group. Most patients in both groups achieved venous recanalization according to the Modified Qureshi scale (27 (75%; 95% CI, 60.1-89.9) in the dabigatran etexilate group vs 34 (82.9%; 95% CI, 70.9-95.0) in the warfarin group) and exhibited improvement in papilledema as per the Frisén classification (35 (97.2%; 95% CI, 91.6-100.0) in the dabigatran etexilate group vs 37 (88.1%, 95% CI, 77.9-98.3) in the warfarin group)., Conclusions: These findings regarding efficacy and safety support the consideration of dabigatran etexilate therapy as a viable treatment option for Chinese patients with CVT., Competing Interests: Declaration of conflicting interestsThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
- Published
- 2024
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169. Unraveling the toxicity response and metabolic compensation mechanism of tannic acid-Cr(III) complex on alga Raphidocelis subcapitata.
- Author
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Kong D, Ma H, Zhu C, Hao Y, and Li C
- Subjects
- Chromium toxicity, Photosynthesis drug effects, Water Pollutants, Chemical toxicity, Polyphenols, Tannins
- Abstract
Due to their assembly properties and variable molecular weights, the potential biological toxicity effects of macromolecular organic ligand heavy metal complexes are more difficult to predict and their mechanisms are more complex. This study unraveled the toxicity response and metabolic compensation mechanism of tannic acid-Cr(III) (TA-Cr(III)) complex on alga Raphidocelis subcapitata using multi-omics approaches. Results showed TA-Cr(III) complex caused oxidative damage and photosystem disruption, destroying the cell morphology and inhibiting algal growth by >80 % at high exposure levels. TA-Cr(III) complex stress down-regulated proteins linked to proliferation, photosynthesis and antioxidation while upregulating carbon fixation, TCA cycle and amino acid metabolism. The increase of fumarate, citrate, isocitrate and semialdehyde succinate was validated by metabolomics analysis, which improved the TCA cycle, amino acid metabolism and carbon fixation. Activation of the above cellular processes somewhat compensated for the inhibition of algal photosynthesis by TA-Cr(III) complex exposure. In conclusion, physiological toxicity coupled with downstream metabolic compensation in response to Cr(III) complex of macromolecular was characterized in Raphidocelis subcapitata, unveiling the adaptive mechanism of algae under the stress of heavy metal complexes with macromolecular organic ligands., Competing Interests: Declaration of competing interest The authors declare that we 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
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170. Innovative wearable solutions: Semi-releasing ion-conductive lignin hydrogel sensors for enhanced practicability.
- Author
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Ma H, Yang Y, Xu Z, Liu X, Wang F, Qiao Y, and Song Y
- Subjects
- Humans, Electric Conductivity, Tensile Strength, Aluminum Chloride chemistry, Ions chemistry, Lignin chemistry, Wearable Electronic Devices, Hydrogels chemistry
- Abstract
The severe negative effects of impurities adhering to the external surface of wearable devices can significantly influence the signal transmission, performance, and lifespan of hydrogel sensors. Herein, we developed an ion-conducting hydrogel sensor with a strong adhesive side and a non-adhesive side, similar to a "semi-releasing material." This hydrogel, formulated using deep eutectic solvents obtained from choline chloride and acrylic acid, contained lignin. This versatile material, exhibiting properties similar to semi-releasing materials, was treated with an AlCl
3 solution on one side. Additionally, the hydrogel was successfully used as a highly adhesive strain sensor for real-time monitoring of various human activity signals. Moreover, the hydrogel demonstrated excellent environmental tolerance and conductivity. Lignin extracted from wood flour endowed the hydrogel sensor with excellent adhesion energy (up to 427.1 J/m2 ) and UV resistance. Treatment of hydrogels with AlCl3 completely eliminated their adhesiveness, thereby enhancing fracture elongation and tensile strength. This improvement can be attributed to the absence of carboxyl groups and the formation of a metal-phenolic network. The implementation of this convenient and efficient strategy provides a more feasible approach to address challenges related to impurity adhesion and signal transmission in flexible wearable devices., 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. Published by Elsevier B.V.)- Published
- 2024
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171. Efficient and Selective Electrochemical Nitrate Reduction to N 2 Using a Flow-Through Zero-Gap Electrochemical Reactor with a Reconstructed Cu(OH) 2 Cathode: Insights into the Importance of Inter-Electrode Distance.
- Author
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Zhou J, Zhu Y, Wen K, Pan F, Ma H, Niu J, Wang C, and Zhao J
- Subjects
- Electrodes, Nitrogen analysis, Nitrogen chemistry, Kinetics, Nitrates chemistry, Wastewater
- Abstract
Electrochemically converting nitrate, a widely distributed nitrogen contaminant, into harmless N
2 is a feasible and environmentally friendly route to close the anthropogenic nitrogen-based cycle. However, it is currently hindered by sluggish kinetics and low N2 selectivity, as well as scarce attention to reactor configuration. Here, we report a flow-through zero-gap electrochemical reactor that shows a high performance of nitrate reduction with 100% conversion and 80.36% selectivity of desired N2 in the chlorine-free system at 100 mg-N·L-1 NO3 - . More importantly, the mass transport and current utilization efficiency are significantly improved by shortening the inter-electrode distance, especially in the zero-gap electrocatalytic system where the current efficiency reached 50.15% at 5 mA·cm-1 . More importantly, the mass transport and current utilization efficiency are significantly improved by shortening the inter-electrode distance, especially in the zero-gap electrocatalytic system where the current efficiency reached 50.15% at 5 mA·cm-2 . Detailed characterizations demonstrated that during the electroreduction process, partial Cu(OH)2 on the cathode surface was reconstructed into stable Cu/Cu2 O as the active phase for efficient nitrate reduction. In situ characterizations revealed that the highly selective *NO to *N conversion and the N-N coupling step played crucial roles during the selective reduction of NO3 - to N2 in the zero-gap electrochemical system. In addition, theoretical calculations demonstrated that improving the key intermediate *N coverage could effectively facilitate the N-N coupling step, thereby promoting N2 selectivity. Moreover, the environmental and economic benefits and long-term stability shown by the treatment of real nitrate-containing wastewater make our proposed electrocatalytic system more attractive for practical applications.- Published
- 2024
- Full Text
- View/download PDF
172. Remote ischemic conditioning improves cerebral hemodynamics in symptomatic intracranial atherosclerosis: A PET/CT-guided randomized controlled study.
- Author
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An H, Ma H, Wu C, Cui C, Wu L, Zhao W, Cui B, Li S, Wu D, Hu W, and Ji X
- Subjects
- Adult, Humans, Positron Emission Tomography Computed Tomography, Ischemia, Hemodynamics, Glucose, Ischemic Stroke, Intracranial Arteriosclerosis diagnostic imaging, Intracranial Arteriosclerosis therapy
- Abstract
Patients with symptomatic intracranial arterial stenosis (sICAS) suffer embarrassed hemodynamic status and acute ischemic stroke (AIS) recurrence. We aimed to assess the efficacy of remote ischemic conditioning (RIC) on improving this status by evaluating cerebral blood flow (CBF) and cerebral glucose metabolism (CGM) via PET/CT. Adult patients with unilateral sICAS in middle cerebral artery and/or intracranial segment of internal carotid artery-related AIS or transient ischemic attack within 6 months prior to randomization were enrolled. Individuals who received intravenous thrombolysis or endovascular treatment, or sICAS caused by cardiac embolism, small vessel occlusion, or other determined causes were excluded. Twenty-three eligible patients were randomly assigned to standard medical treatment (SMT) (n = 10) or RIC group (n = 13). The RIC protocol consisted of 5 cycles, each for 5-min bilateral upper limb ischemia and 5-min reperfusion period, twice a day, with a total duration of 3 months. Ten healthy volunteers were enrolled as healthy control group. We tested CBF and CGM at the rest stage and the methazolamide-induced stress stage. All patients received PET/CT at baseline and three-month followup. Both CBF and CGM in ipsilateral hemisphere of sICAS patients were significantly decreased at the rest stage and the stress stage (p < .05), which were improved by three-month RIC (p < .05). The lesions decreased notably in RIC group compared to SMT group (p < .05). RIC ameliorated the hemodynamic status and glucose metabolism in regions at high risk of infarction, which might improve the resistance capacity towards ischemic load in sICAS patients., (© 2024 Wiley Periodicals LLC.)
- Published
- 2024
- Full Text
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173. Immobilization of chromium in real tannery sludge via heat treatment with coal fly ash.
- Author
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Yang Y, Shi S, Zhu C, Chen X, Hao Y, Yan L, Li J, Chen X, Chen B, Ma X, and Ma H
- Subjects
- Humans, Coal Ash, Hot Temperature, Coal, Ecosystem, Incineration, Chromium chemistry, Sewage
- Abstract
The secure and harmless disposal for Cr-bearing tannery sludge (Cr-TS) has attracted an increasing concern, due to potentially adverse effect on ecosystem and human health. A greener alternative method about "waste treatment with waste" for thermally stabilizing real Cr-TS was developed via employing coal fly ash (CA) as dopants in this research. The co-heat treatment of Cr-TS and CA was carried out at the temperature range of 600-1200 °C to investigate the oxidation of Cr(III), immobilization of chromium and leaching risk of the sintered products, and the mechanism of chromium immobilization was further explored. The results indicate that the doping of CA can significantly inhibit the oxidation of Cr(III) and immobilize chromium by incorporating chromium into spinel and uvarovite microcrystal. At the temperature higher than 1000 °C, most of chromium can be converted into stable crystalline phases. Furthermore, a prolonged leaching test was conducted to study the leaching toxicity of chromium in sintered products, indicating that leaching content of chromium is much less than the regulatory limit. This process is a feasible and promising alternative for immobilization of chromium in Cr-TS. The research findings are supposed to offer a theoretical foundation and strategy choice for thermal stabilization of chromium, as well as safety and harmless disposal of Cr-containing hazardous waste., 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
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174. Organophosphate esters in the seawater of the Bohai Sea: Environmental occurrence, sources and ecological risks.
- Author
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Xing R, Zhang P, Zheng N, Ji H, Shi R, Ge L, and Ma H
- Subjects
- Environmental Monitoring, Esters analysis, Organophosphates analysis, Seawater, Water analysis, China, Flame Retardants analysis, Water Pollutants, Chemical analysis
- Abstract
Organophosphate esters (OPEs) are widely distributed in surface water systems, but limited information was available on the spatial occurrence and ecological risks of OPEs in the Bohai Sea. In this study, 89 water samples in the Bohai Sea and the five surrounding rivers were investigated for the determination of 15 OPEs. The concentration of ∑
15 OPEs ranged from 373.20 to 2931.27 ng·L-1 in the river water and 137.81 to 2641.30 ng·L-1 in the seawater, with high levels of OPEs in Liaodong Bay. Tris(2-chloroethyl) phosphate (TCEP, 10- 92 %) and triethyl phosphate (TEP, 5- 64 %) were dominant for OPEs. The correlation analysis, principal component analysis and hierarchical cluster analysis suggested the conjunction of municipal wastewater via river input and maritime shipping was the main source of OPEs in the Bohai Sea. The ecological risk assessment indicated that the individual OPEs arise low ecological risks in the Bohai Sea, while medium ecological risks of ∑15 OPEs are in minority river samples., 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
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175. Revealing the activity origin of ultrathin nickel metal-organic framework nanosheet catalysts for selective electrochemical nitrate reduction to ammonia: Experimental and density functional theory investigations.
- Author
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Pan F, Zhou J, Wang T, Zhu Y, Ma H, Niu J, and Wang C
- Subjects
- Ammonia, Nickel, Density Functional Theory, Nitrates, Metal-Organic Frameworks
- Abstract
The electrochemical nitrate reduction reaction (NitRR) affords a sustainable way for nitrate mitigation and ammonia synthesis, but there are still some problems such as poor nitrate conversion, low ammonia selectivity, and slow reaction kinetics. A clear structure-performance relationship is essential for designing efficient catalysts and understanding the reaction mechanisms. Herein, ultrathin nickel metal-organic framework (Ni-MOF) nanosheets supported on Ni foam featuring a well-defined stable structure, large electrochemically active surface area, and low electron transport resistance were prepared by a one-step solvothermal process. At -1.4 V, the nitrate reduction, rate constant, ammonia selectivity, and yield reached 96.4%, 0.448 h
-1 , 80%, and 110.13 ug·h-1 ·cm-2 , respectively. Experimental and theoretical studies demonstrated that the hydroxyl-ligated Ni atoms exhibited higher nitrate adsorption properties and lower activation energy towards NitRR compared to carboxylic acid-ligated Ni atoms. Mechanism investigations revealed a nitrate-to-ammonia reaction pathway involving multiple intermediate species on Ni-MOF nanosheet catalysts. This work offers a new avenue to construct highly efficient electrocatalysts for the selective transformation of nitrate to valuable ammonia., 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
- 2023
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176. The optimum anticoagulation time after endovascular thrombectomy for atrial fibrillation-related large vessel occlusion stroke: a real-world study.
- Author
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Ma H, Che R, Zhang Q, Yu W, Wu L, Zhao W, Li M, Wu D, Wu C, and Ji X
- Subjects
- Humans, Anticoagulants adverse effects, Hemorrhage, Intracranial Hemorrhages etiology, Thrombectomy adverse effects, Treatment Outcome, Atrial Fibrillation complications, Atrial Fibrillation surgery, Brain Ischemia complications, Brain Ischemia surgery, Endovascular Procedures adverse effects, Ischemic Stroke complications, Stroke etiology, Stroke surgery
- Abstract
Objectives: To investigate the relationship between the initiation time of anticoagulation after endovascular treatment (EVT) and the outcomes in atrial fibrillation (AF)-related acute ischemic stroke (AIS) patients., Methods: In this prospective registry study, from March 2013 to June 2022, patients with anterior circulation territories AF-related AIS who underwent EVT within 24 h were included. The primary outcome was favorable [modified Rankin Scale (mRS) 0-1) at ninety days and the secondary outcome was hemorrhage events after anticoagulants. Factors affecting the outcomes were pooled into multivariate regression and ROC curve analysis., Results: Of 234 eligible patients, there were 63 (26.9%) patients achieved a favorable outcome. The symptomatic intracranial hemorrhage (sICH), ICH, and systemic hemorrhage events after anticoagulants occurred in 8 (3.4%), 28 (12.0%), and 39 (16.7%) patients, severally. A longer EVT to anticoagulation time (p = 0.033) was associated with an unfavorable outcome (mRS 3-6). An earlier EVT to anticoagulation time was the independent risk factor of sICH (p = 0.043), ICH (p = 0.005), and systemic hemorrhage (p = 0.005). There was no significant difference in recurrent AIS/ transient ischemic attack (TIA) or mortality among patients who started anticoagulation at ≤ 4 days, ≥ 15 days, or 4 to 15 days. The optimum cut-off for initiating anticoagulants to predict a favorable outcome and hemorrhage events was 4.5 days and 3.5 days after EVT, respectively., Conclusions: In AF-related AIS, the time of EVT to anticoagulation is an independent factor of the functional outcome and hemorrhage events after anticoagulation. The optimal initiate time of anticoagulant after EVT is 4.5 days., Clinicaltrialregister: NCT03754738., (© 2023. The Author(s).)
- Published
- 2023
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177. Argatroban Resistance and Successful Adjunctive Anticoagulation for Cerebral Venous Sinus Thrombosis With SERPINC1 Mutation: A Case Report.
- Author
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Ma H, Zhang Q, Gu Y, Ji X, and Duan J
- Abstract
Objectives: Anticoagulation therapy for cerebral venous sinus thrombosis (CVST) with antithrombin (AT) deficiency due to SERPINC1 mutation does not often yield the expected outcomes. Argatroban may be effective for thrombophilia caused by SERPINC1 mutation. However, argatroban resistance deserves attention., Methods: We report a case of a 19-year-old man who was admitted to the hospital with sudden headache, nausea, vomiting, and eye swelling for 3 days. Brain MRI on admission showed multifocal CVST., Results: SERPINC1 mutation (exon1, c.40delA: [p.R14Gfs*17]) combined with hereditary AT deficiency (AT activity was 50% [reference range: 80%-120%]) was detected in this patient. A high dose of anticoagulation treatment with argatroban did not improve the activated partial thromboplastin time (APTT) level to the target range (1.5-3 times over the initial baseline level) for this case. We chose adjunctive anticoagulation (argatroban-combined low-molecular-weight heparin), and the APTT gradually reached the target level. At 3-month follow-up, no recurrence of headache or any systemic hemorrhage was found and the ultrasonography of the optic nerve sheath showed normal. Magnetic resonance black blood thrombosis imaging suggested thrombus absorption., Discussion: Argatroban resistance may be associated with thrombin receptor saturation and deserves attention. The use of adjunctive anticoagulants may be the optimum strategy during acute and subacute phases of CVST with AT deficiency due to SERPINC1 mutation., Competing Interests: The authors report no relevant disclosures. Full disclosure form information provided by the authors is available with the full text of this article at Neurology.org/cp., (Copyright © 2023 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.)
- Published
- 2023
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178. Factors affecting the outcomes of tirofiban after endovascular treatment in acute ischemic stroke: Experience from a single center.
- Author
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Wang Y, Ma H, Zhang Q, Jin F, Xu Y, Ma Q, and Ji X
- Subjects
- Humans, Tirofiban therapeutic use, Retrospective Studies, Treatment Outcome, Stroke drug therapy, Ischemic Stroke drug therapy, Ischemic Stroke surgery, Brain Ischemia drug therapy, Endovascular Procedures
- Abstract
Aims: To investigate the predicted factors influencing the outcomes in acute ischemic stroke (AIS) patients who received tirofiban after endovascular treatment (EVT) and the optimal administration of tirofiban., Methods: In this retrospective study, AIS patients who received EVT followed by tirofiban between January 2017 and October 2021 were enrolled. The dose and duration of tirofiban were adjusted by trained clinicians according to the patient's clinical status. A reduction of at least four points on the National Institutes of Health Stroke Scale (NIHSS) after tirofiban compared with that before tirofiban was defined as an effective response. A modified ranking scale (mRS) of 0-2 was defined as a favorable outcome at a 90-day follow-up., Results: A total of 260 consecutive patients were enrolled, and 36.5% of patients achieved a favorable outcome. The modified thrombolysis in cerebral infarction (mTICI) 2b-3 occurred in 93.5% of patients. Symptomatic intracerebral hemorrhage (sICH) occurred in 6.2% of patients, and the mortality at 90-day follow-up was 16.9%. Duration of tirofiban >24 h (adjusted OR: 2.545; 95% CI: 1.008-6.423; p = 0.048) and effective response to tirofiban (adjusted OR: 25.562; 95% CI: 9.794-66.715; p < 0.001) were related to the favorable outcome (mRS 0-2). Higher NIHSS (adjusted OR: 0.855; 95% CI: 0.809-0.904; p < 0.001) and glucose level on admission (adjusted OR: 0.843; 95% CI: 0.731-0.971; p = 0.018) were predictive for the unfavorable outcome (mRS 3-6)., Conclusions: An effective response to tirofiban is an independent factor in predicting the long-term efficacy outcome, and extending the duration of tirofiban is beneficial for neurological improvement., (© 2023 The Authors. CNS Neuroscience & Therapeutics published by John Wiley & Sons Ltd.)
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- 2023
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179. Photodegradation of hydroxyfluorenes in ice and water: A comparison of kinetics, effects of water constituents, and phototransformation by-products.
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Ge L, Cao S, Halsall C, Niu J, Bai D, He G, Zhang P, and Ma H
- Subjects
- Ferric Compounds, Fluorenes analysis, Humic Substances analysis, Ice analysis, Kinetics, Photolysis, Water chemistry, Polycyclic Aromatic Hydrocarbons analysis, Water Pollutants, Chemical analysis
- Abstract
The photochemical behavior of organic pollutants in ice is poorly studied in comparison to aqueous photochemistry. Here we report a detailed comparison of ice and aqueous photodegradation of two representative OH-PAHs, 2-hydroxyfluorene (2-OHFL) and 9-hydroxyfluorene (9-OHFL), which are newly recognized contaminants in the wider environment including colder regions. Interestingly, their photodegradation kinetics were clearly influenced by whether they reside in ice or water. Under the same simulated solar irradiation (λ > 290 nm), OHFLs photodegraded faster in ice than in equivalent aqueous solutions and this was attributed to the specific concentration effect caused by freezing. Furthermore, the presence of dissolved constituents in ice also influenced photodegradation with 2-OHFL phototransforming the fastest in 'seawater' ice (k = (11.4 ± 1.0) × 10
-2 min-1 ) followed by 'pure-water' ice ((8.7 ± 0.4) × 10-2 min-1 ) and 'freshwater' ice ((8.0 ± 0.7) × 10-2 min-1 ). The presence of dissolved constituents (specifically Cl- , NO3 - , Fe(III) and humic acid) influences the phototransformation kinetics, either enhancing or suppressing phototransformation, but this is based on the quantity of the constituent present in the matrixes, the specific OHFL isomer and the matrix type (e.g., ice or aqueous solution). Careful derivation of key photointermediates was undertaken in both ice and water samples using tandem mass spectrometry. Ice phototransformation exhibited fewer by-products and 'simpler' pathways giving rise to a range of hydroxylated fluorenes and hydroxylated fluorenones in ice. These results are of importance when considering the fate of PAHs and OH-PAHs in cold regions and their persistence in sunlit ice., (Copyright © 2021. Published by Elsevier B.V.)- Published
- 2023
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180. An Optimized Ni-catalyzed Chan-Lam Type Coupling: Enantioretentive Access to Chiral N-Aryl Sulfinamides.
- Author
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Li C, Zhang K, Ma H, Wu S, Huang Y, Duan Y, Luo Y, Yan J, and Yang G
- Subjects
- Chemistry Techniques, Synthetic, Ligands, Catalysis
- Abstract
C-N bond formation takes on a critical significance in reactions of organic synthesis, material production and pharmaceutical manufactory. Chan-Lam has proposed a useful methodology to furnish secondary arylamides under mild conditions. However, when chiral sulfinamides serve as the coupling precursors, the Cu-catalyzed coupling reaction is found with low efficacy. Complex side-products are generated under classic conditions. Moreover, it led to the racemization of the coupling product. In this study, an optimized Ni-catalyzed Chan-Lam type coupling conditions were proposed, which resulted in clean conversion from chiral sulfinamides and arylboronic acids to offer N-aryl sulfinamides efficiently and enantioretentively. The trans-N
1 ,N2 -dimethylcyclohexane-1,2-diamine was proven as the most efficient ligand. Under the optimized conditions, a series of chiral N-aryl sulfinamides was prepared with high chemical yield without racemization. Furthermore, a plausible and novel mechanism was proposed. Interestingly, the method could efficiently furnish a wide variety of C-X bonds by coupling arylboronic acids with different nucleophiles., (© 2022 Wiley-VCH GmbH.)- Published
- 2022
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181. Complexation behaviour and removal of organic-Cr(III) complexes from the environment: A review.
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Hao Y, Ma H, Wang Q, Zhu C, and He A
- Subjects
- Hydroxyl Radical, Organic Chemicals, Oxidation-Reduction, Chromium chemistry, Industrial Waste
- Abstract
Chromium (Cr) is mainly found in the form of organic-Cr(III) complexes in the natural environment and industrial waste. The widespread existence of composite contaminants composed of organic matter (OM) and Cr pose a serious ecological threat, and its potential interaction and removal need to be further summarised. Organic ligands, such as carbohydrates, nitrogen compounds, phenolic compounds, humus substances (HS), and low molecular weight organic acids (LMWOAs), play an important role in governing the speciation, mobility, and absorption and desorption of Cr in the environment. Moreover, growing evidence indicates that oxygen-containing functional groups (e.g., carboxyl, hydroxyl, and phosphate) are closely related to the complexation of Cr(III). Advanced oxidation processes (AOPs) are efficient and widely applicable technologies. However, the re-complexation of oxidation intermediates with Cr(III) and the formation and accumulation of much more toxic Cr(VI) species hinder the possible utilisation of AOPs. In this paper, the sources and harmful effects of organic-Cr(III) complexes are reported in detail. The complexation behaviour and structure of the organic-Cr(III) complexes are also described. Subsequently, the application of AOPs in the decomplexation and degradation of organic-Cr(III) complexes is summarised. This review can be helpful for developing technologies that are more efficient for organic-Cr(III) complex removal and establishing the scientific background for reducing Cr discharge Cr into the environment., (Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.)
- Published
- 2022
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182. Occurrence, spatial distributions, and ecological risk of pyrethroids in coastal regions of South Yellow and East China Seas.
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Cao S, Zhang P, Cai M, Yang Y, Liu Y, Ge L, and Ma H
- Subjects
- China, Environmental Monitoring, Oceans and Seas, Seawater, Pyrethrins analysis, Water Pollutants, Chemical analysis
- Abstract
Pyrethroids are increasingly receiving attention as aqueous micropollutants, but their presence has been reported only in a few small coastal areas. In this study, we investigated the distribution, sources, and risks of nine pyrethroids in large marine zones. The 40 seawater samples were collected from the South Yellow Sea (SYS) and East China Sea (ECS) in China, during the spring of 2020, using a high-volume, solid-phase extraction method. The total pyrethroid concentrations ranged from 0.72 to 1.82 ng L
-1 in the SYS and from 0.02 to 11.0 ng L-1 in the ECS. We used cluster analysis to classify pollutant sources into five categories, and discussed the influence of sources on the transport and distribution of pyrethroids in each group. Ecological risk assessment indicated that pyrethroids pose a high risk to crustaceans and a negligible risk to others. These results are important for understanding the behavior of pyrethroids in marine environments., (Copyright © 2022 Elsevier Ltd. All rights reserved.)- Published
- 2022
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183. Investigation on Water Transformation and Pore Structure of Cement-Stabilized Dredged Sediment Based on NMR Technology.
- Author
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Wang S, He X, Cai G, Lang L, Ma H, Gong S, and Niu Z
- Abstract
Cement-stabilized dredged sediment (CDS) when used as a new road construction material cannot only solve the problem of abandoned sediment disposal, but also effectively save natural soil resources. This study aimed to evaluate the strength and permeability of CDS and establish corresponding prediction models from the perspective of a stabilization mechanism. The soil-water composition and pore size distribution were investigated by the nuclear magnetic resonance (NMR) technique. The results demonstrated that more liquid pore water inside the CDS specimen transformed into combined water with cement hydration. The amount of combined water, which essentially characterized the hydration process of cement, presented a linear relationship with log ( t ). The cementation and filling action of hydrates resulted in the transformation of large pores into smaller ones, hence the optimal pore size decreased with an increasing curing period and cement content. The stress-strain curves and hydraulic conductivity were determined based on unconfined compression and flexible wall penetration tests, respectively. The unconfined compressive strength increased exponentially with the amount of combined water, and the functional correlations of hydraulic conductivity and micropore parameters were established. The reliability of the NMR technique as a new method to study the microscopic evolution mechanism of the strength and permeability of CDS was further verified by scanning electron microscopy and mercury intrusion porosimetry tests.
- Published
- 2022
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184. Ultralong-lifetime Ti/RuO 2 -IrO 2 @Pt anodes with a strong metal-support interaction for efficient electrochemical mineralization of perfluorooctanoic acid.
- Author
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Zhou J, Wang T, Cheng C, Pan F, Zhu Y, Ma H, and Niu J
- Abstract
Electrocatalytic oxidation is regarded as an effective technique for decomposing refractory organic compounds like perfluorooctanoic acid (PFOA). However, achieving highly efficient and long-life electrodes is still a great challenge. Herein, Ti/RuO
2 -IrO2 @Pt anodes consisting of Pt4+ and Pt0 species were fabricated by combining modified microemulsion technology with a calcination process, in which Pt nanoparticles were highly dispersed and encapsulated in Ru-Ir composite oxides to form a strong metal-support interaction (SMSI) structure. The as-constructed SMSI layer on the Ti/RuO2 -IrO2 @Pt anode resulted in the improvement of the charge transfer capability and also increased the degradation (99.30%) and mineralization (91.32%) of PFOA during the electrochemical oxidation process. Notably, the service lifetime of Ti/RuO2 -IrO2 @Pt anodes was remarkably improved from 24 to 42.3 h compared to commercial Ti/RuO2 -IrO2 anodes. Moreover, the possible degradation mechanism of PFOA was also speculated through the detection of short-chain perfluorocarboxylic acids and reactive radicals. These results not only revealed that the concept and methodology of SMSI could be an effective way for constructing highly efficient and stable electrocatalysts but also greatly advanced fundamental understanding.- Published
- 2022
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185. Tanning process promotes abiotic humification: separation and characterization of humic acid-like polymers complex.
- Author
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Zhu C, Wang H, Ma H, Yang Y, and Li F
- Subjects
- Catalysis, Oxides, Polymers, Soil, Humic Substances analysis, Manganese Compounds
- Abstract
Humic-like substances are essential components of soluble organic matter in tannery wastewater. However, the tannery process can promote the abiotic humification in wastewater. Therefore, it is of great significance to clarify the pathway and degree of abiotic humification and the properties of the as-derived humic acid-like (HAL) complex polymers in the tannery process in order to control the refractory organic compounds. In the present study, considering the catechol-Maillard system and commercial humic acid (HA) as control, the polyphenol-Maillard humification in the tannery process was simulated under the catalysis of MnO
2 . Moreover, physicochemical and spectroscopic techniques were used to characterize the separated fractions of HAL further. As a result, it was found that the catechol-Maillard system with small molecule organic matter as precursor had higher humification degree. Furthermore, the ultraviolet-visible (UV-Vis), Fourier transform infrared (FTIR), and excitation-emission matrix (EEM) fluorescence spectrum of humic acid-like 0 (HAL0) derived from it was different from those of humic acid-like 1 and 2 (HAL1 and HAL2) of polyphenol-Maillard system, indicating the differences of polymer structure between them. In the polyphenol-Maillard system, tannin was the skeleton of polymerization or polycondensation reaction, and the high content of N and the H/C value of HAL2 indicated that in adding to amino acids, proteins promoted the humification, forming industry-specific HAL polymers with a high degree of aliphatic nature. Therefore, it can be concluded that controlling the raw materials in the tannery process (especially tannins), in order to reduce the occurrence of abiotic humification may be the key to improve the efficiency of wastewater treatment.- Published
- 2020
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186. Letter by Wu et al Regarding Article, "Intravenous Tissue-Type Plasminogen Activator in Acute Ischemic Stroke Patients With History of Stroke Plus Diabetes Mellitus".
- Author
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Wu C, Ma H, and Ji X
- Subjects
- Fibrinolytic Agents, Humans, Tissue Plasminogen Activator, Brain Ischemia, Diabetes Mellitus, Stroke
- Published
- 2019
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187. Recovery of valuable metals from mixed types of spent lithium ion batteries. Part II: Selective extraction of lithium.
- Author
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Chen X, Cao L, Kang D, Li J, Zhou T, and Ma H
- Subjects
- Metals, Recycling, Spectroscopy, Fourier Transform Infrared, Electric Power Supplies, Lithium
- Abstract
Extensive usage of different kinds of lithium ion batteries (LIBs) may result in a huge amount of complicated waste batteries stream, while insufficient attention has been paid on the selective recovery of lithium from these already complicated wastes. Herein, a novel approach was developed for the selective extraction of Li from mixed types of LIBs (LiCoO
2 , LiMn2 O4 , LiFePO4 and LiCo1/3 Mn1/3 Ni1/3 O2 ) using mild phosphoric acid as efficient leaching agent. It can be concluded from leaching results that 100%, 92.86%, 97.57% and 98.94% Li can be selectively extracted from waste cathode materials of LiCoO2 , LiMn2 O4 , LiFePO4 and LiCo1/3 Mn1/3 Ni1/3 O2 , respectively, while transition metals (Co, Mn, Fe and Ni) can be hardly leached in mild acidic media under optimized leaching conditions. In addition, high selectivity coefficients (βLi/Me ) can be obtained during the extraction of Li from other metals. It can be also discovered from characterization results (SEM, XRD, FT-IR and Raman spectra) that leaching residues are phosphate precipitates, which might be used for the recycling of other metals and preparation of cathode materials. Results from leaching kinetics indicate that the leaching of Li is chemical and internal diffusion controlled reaction, with apparent activation energy (Ea) of 37.74, 21.16, 27.47 and 21.86 kJ/mol for LiCoO2 , LiMn2 O4 , LiFePO4 and LiCo1/3 Mn1/3 Ni1/3 O2 , respectively. Finally, lithium phosphate with a purity of 98.4% can be obtained and the whole process can be efficient candidate for Li recovery with minor environmental impact and little waste produced., (Copyright © 2018 Elsevier Ltd. All rights reserved.)- Published
- 2018
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188. Organic reductants based leaching: A sustainable process for the recovery of valuable metals from spent lithium ion batteries.
- Author
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Chen X, Guo C, Ma H, Li J, Zhou T, Cao L, and Kang D
- Subjects
- Electric Power Supplies, Lithium, Metals, Spectroscopy, Fourier Transform Infrared, Electronic Waste, Recycling, Reducing Agents
- Abstract
It is significant to recover metal values from spent lithium ion batteries (LIBs) for the alleviation or prevention of potential risks towards environmental pollution and public health, as well as for the conservation of valuable metals. Herein a hydrometallurgical process was proposed to explore the possibility for the leaching of different metals from waste cathodic materials (LiCoO
2 ) of spent LIBs using organics as reductant in sulfuric acid medium. According to the leaching results, about 98% Co and 96% Li can be leached under the optimal experimental conditions of reaction temperature - 95 °C, reaction time - 120 min, reductive agent dosage - 0.4 g/g, slurry density - 25 g/L, concentration of sulfuric acid-3 mol/L in H2 SO4 + glucose leaching system. Similar results (96% Co and 100% Li) can be obtained in H2 SO4 + sucrose leaching system under optimized leaching conditions. Despite a complete leaching of Li (∼100%), only 54% Co can be dissolved in the H2 SO4 + cellulose leaching system under optimized leaching conditions. Finally, different characterization methods, including UV-Vis, FT-IR, SEM and XRD, were employed for the tentative exploration of reductive leaching reactions using organic as reductant in sulfuric acid medium. All the leaching and characterization results confirm that both glucose and sucrose are effective reductants during leaching, while cellulose should be further degraded to organics with low molecular weights to achieve a satisfactory leaching performance., (Copyright © 2018 Elsevier Ltd. All rights reserved.)- Published
- 2018
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189. Elevated plasma levels of Mac-2 binding protein predict poor cardiovascular outcomes in patients with acute coronary syndrome.
- Author
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Xie H, Zhang Z, Chen L, Zhang P, Cui Y, Liu H, Ma H, Jiang Y, Wang Y, Yang L, Wu H, and Cui L
- Subjects
- Acute Coronary Syndrome diagnostic imaging, Acute Coronary Syndrome mortality, Acute Coronary Syndrome therapy, Aged, Angina, Unstable diagnostic imaging, Angina, Unstable mortality, Angina, Unstable therapy, Biomarkers blood, Case-Control Studies, Chi-Square Distribution, Coronary Angiography, Female, Follow-Up Studies, Humans, Kaplan-Meier Estimate, Male, Middle Aged, Multivariate Analysis, Non-ST Elevated Myocardial Infarction diagnostic imaging, Non-ST Elevated Myocardial Infarction mortality, Non-ST Elevated Myocardial Infarction therapy, Plaque, Atherosclerotic, Prognosis, Proportional Hazards Models, Prospective Studies, Risk Factors, Rupture, Spontaneous, ST Elevation Myocardial Infarction diagnostic imaging, ST Elevation Myocardial Infarction mortality, ST Elevation Myocardial Infarction therapy, Time Factors, Up-Regulation, Acute Coronary Syndrome blood, Angina, Unstable blood, Antigens, Neoplasm blood, Membrane Glycoproteins blood, Non-ST Elevated Myocardial Infarction blood, ST Elevation Myocardial Infarction blood
- Abstract
Background: Mac-2 binding protein (M2BP) is an inflammatory glycoprotein associated with carotid atherosclerosis and all-cause mortality in patients with suspected coronary artery diseases. We aimed to explore the potential association of plasma M2BP levels with unstable plaque morphology and cardiovascular outcomes in patients with acute coronary syndrome (ACS)., Patients and Methods: We compared plasma M2BP levels among three groups: 216 patients with ACS, 82 patients with stable angina pectoris, and 50 controls. Angiographic analyses of complex lesions were carried out in patients with ACS and they were followed up prospectively for 12 months for the occurrence of major adverse cardiovascular outcomes (MACEs)., Results: Patients with ACS showed significantly higher plasma levels of M2BP than patients with stable angina pectoris (P<0.001) and controls (P<0.001). M2BP levels correlated positively with the presence (P<0.001) and extent (P=0.005) of complex lesions. During follow-up, 45 (20.8%) cases of MACEs occurred. Survival analysis indicated that high M2BP levels were associated with a poor prognosis (log-rank P=0.008). After Cox multivariate adjustment, plasma M2BP levels remained an independent predictor of MACEs either as a continuous variable (hazard ratio: 1.178, 95% confidence interval: 1.093-1.270, P<0.001) or as a categorical variable (hazard ratio: 2.783, 95% confidence interval: 1.433-5.404, P=0.002)., Conclusion: Plasma M2BP levels might be predictive of unstable plaque and were associated independently with poor cardiovascular outcomes in patients with ACS.
- Published
- 2017
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190. Chromium speciation in tannery effluent after alkaline precipitation: Isolation and characterization.
- Author
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Wang D, He S, Shan C, Ye Y, Ma H, Zhang X, Zhang W, and Pan B
- Abstract
It is difficult to completely remove Cr(III) from tannery effluent by alkaline precipitation due to the abundance of strong organic ligands. Thereby, the speciation of the residual Cr after alkaline precipitation is of crucial significance to guide the selection and design of further treatment process. For the first time, we revealed the speciation of the residual Cr with the aid of comprehensive analytical techniques. Results showed that the residual Cr(III) mostly located in two size ranges, i.e. the 13-100nm fraction and the <4nm fraction. Combined spectral analyses demonstrated Cr(III) was coordinated by carboxyl groups or hydroxyl groups in both fractions, while the complexation by nitrogen-containing groups was excluded by the total nitrogen and UPLC-MS analysis in the two fractions, respectively. Based on the comprehensive analyses, the structures of Cr(III) complexes in both fractions were proposed. Cr(III) cross-linked the carboxyl groups from polyacrylic acid chains to form the network gel structure in the 13-100nm fraction, while the complex structure of Cr(III) in the <4nm fraction was formed through hydroxyl-carboxyl chelation by masking agents such as tartrate and citrate. Although polyoxyethylene ether was abundantly present, it was responsible for the complexation of Cr(III) in neither fraction., (Copyright © 2016 Elsevier B.V. All rights reserved.)
- Published
- 2016
- Full Text
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191. Comment on "Fossil Fuel Combustion-Related Emissions Dominate Atmospheric Ammonia Sources during Severe Haze Episodes: Evidence from 15 N-Stable Isotope in Size-Resolved Aerosol Ammonium".
- Author
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Chang Y and Ma H
- Published
- 2016
- Full Text
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192. Removal of humic acid from aqueous solution by magnetically separable polyaniline: adsorption behavior and mechanism.
- Author
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Wang J, Bi L, Ji Y, Ma H, and Yin X
- Subjects
- Adsorption, Calcium chemistry, Aniline Compounds chemistry, Ferric Compounds chemistry, Humic Substances, Magnetic Fields, Models, Chemical, Silicon Dioxide chemistry
- Abstract
Magnetically separable polyaniline (Fe3O4@SiO2-PANI) was prepared by in situ chemical polymerization of aniline on the surface of silica-coated Fe3O4 nanoparticles, and characterized by FTIR spectroscopy, powder X-ray diffraction, elemental analysis, transmission electron microscopy, vibrating sample magnetometry and X-ray photoelectron spectroscopy. Characterization results showed that Fe3O4@SiO2-PANI with amino groups of 1.78 mmol/g and the average diameter of 21.6 nm are superparamagnetic. Adsorption behavior of Fe3O4@SiO2-PANI nanoparticles for humic acid (HA) was investigated by batch experiments and adsorption kinetic tests. HA adsorption amount on the adsorbent decreased with increasing solution pH and the presence of Ca(2+) resulted in the enhanced HA adsorption. HA adsorption on Fe3O4@SiO2-PANI could be well described by Langmuir model and the maximum adsorption amount of the adsorbent for HA at 25°C was 36.36 mg/g. HA adsorption process on the adsorbent obey pseudo-second-order kinetics and the adsorption rates decrease with increasing initial HA concentration. The XPS analysis verified that HA adsorption over the adsorbent could be attributed to the surface complexation between the disassociated HA molecules and the protonated nitrogen of polyaniline on the adsorbent. HA loaded adsorbent could be magnetically separated and easily desorbed in 0.01 mol/L NaOH solution. Regeneration tests indicated that Fe3O4@SiO2-PANI could be used repeatedly., (Copyright © 2014 Elsevier Inc. All rights reserved.)
- Published
- 2014
- Full Text
- View/download PDF
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