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Effect of carbon material additives on hydrogen evolution at rechargeable alkaline iron battery electrodes

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Materials Science for Energy Technologies 2021年 4卷 236-241页

作者： Arunkumar, P.S. Maiyalagan, T. Kheawhom, Soorathep Mao, Shun Jiang, Zhongqing Department of Physics and Nanotechnology SRM Institute of Science and Technology KattankulathurTamilnadu 603203 India Electrochemical Energy Laboratory Department of Chemistry SRM Institute of Science and Technology KattankulathurTamilnadu 603203 India Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China

In recent years a renewed interest in developing iron electrode for iron based accumulators has risen, govern by the progress in nano-materials research that could bring iron based accumulators nearer to their theoretical energy density and capacity. In this aspect, Iron-Air battery chemistry is best suited for current energy crisis in combination with the cost effectiveness, eco-friendliness, recyclability, non-toxicity of the iron materials. The possibility of Iron-Air battery to function as a rechargeable battery makes this electrochemical systems for engaging development. However, some challenges related to the performance of iron electrode needs to be addressed such as the passivation of the iron electrode on discharge due to the accumulation of iron hydroxide and the low efficiency due to the parasitic hydrogen evolution that occurs during the charging. So the proper engineering and the formulation of iron electrodes are necessary to attain the maximum efficiency for Iron-Air battery. In this exertion, different Fe2O3/Carbon (Fe/C) composites are tested as electrodes for Iron air battery. In addition to this, the prepared materials were comprehensively characterized by X-ray diffraction (XRD). The electrochemical effectiveness of the prepared samples were tested in a three electrode ***2O3/MWCNT electrode show the best electrochemical performance exhibits a specific capacity of about 350 mAhg−1 at 10 mA cm−2 compared to the Fe2O3/Graphene of 300 mAhg−1, Fe2O3/Acetylene black of 225 mAhg−1 and Fe2O3/Vulcan carbon of 180 mAhg−1. © 2021

关键词： Cost effectiveness

Congener-Specificity, Dioxygenation Dependency and Association with Enzyme Binding for Biodegradation of Polybrominated Diphenyl Ethers by Typical Aerobic Bacteria

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SSRN 2022年

作者： Gu, Chenggang Wang, Lei Jin, Zhihua Fan, Xiuli Gao, Zhengyuan Yang, Xinglun Sun, Cheng Jiang, Xin CAS Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences Nanjing210008 China University of the Chinese Academy of Sciences Beijing100049 China Nanjing Audit University Jinshen College Nanjing210042 China State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China

Polybrominated diphenyl ethers (PBDEs) have attracted much concerns of scientific community due to the ubiquitous distribution and toxicological risks in the environment. Though a great number of aerobic bacteria were isolated anticipatorily for rapid removal of PBDEs, the knowledge about biodegradation characteristics and mechanism is less provided yet. In the study, the congener-specificity of aerobic biodegradation by B. xenovorans LB400 was shown since the biodegradation kinetics of PBDEs varied sensitively with bromination pattern. With increase of bromines, the biodegradation was identified with the clear thermodynamic constraint. The high correlativity between the Gibbs free energy changes of initial dioxygenation and apparent biodegradation rates implied the predominance and rate-limiting character of initial dioxygenation, while the regioselectivity at the ortho/meta-sites was also demonstrated for the more negative charge population. The molecular binding with the active domain of dioxygenase BphA1 in LB400 was firstly investigated by molecular docking. As illustrated with the positive relationship, the higher the binding affinity with BphA1 is, the faster the biodegradation occurs. Besides the edge-on π-π stacking with F227 or Y277 and π-cation formulation with histidines (H233, H239), the reticular hydrophobic contact appeared as the major force that account for the high binding affinity and rapid biodegradation of PBDEs. © 2022, The Authors. All rights reserved.

关键词： Biodegradation

Porous pillararene-based polymer as adsorbent and solid disinfectant for water treatment

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Chemosphere 2023年 341卷 140056页

作者： Xu, Guizhou Yang, Pingping Zhang, Yalan Sun, Lin Hu, Xuejiao Zhang, Wenrui Tu, Yizhou Tian, Yuansong Li, Aimin Xie, Xianchuan Gu, Xueyuan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education School of Resources and Environment Nanchang University Nanchang330031 China Jiangxi Nanxin Environmental Protection Technology Co. LTD Jiujiang City of Jiangxi Province 330300 China Nanjing University & Yancheng Academy of Environment Protection Technology and Engineering Nanjing210023 China

Pillararene polymers have been widely used as excellent adsorbents for water treatment, but pillararene polymers with ultra-high specific surface area and versatility are still rarely reported. Herein, a quaternary ammonium salt modified pillar [5] arene polymer, QPBP [5], with specific surface area of 1844 m2 g−1 was successfully synthesized. Since QPBP [5] has abundant different adsorption sites, it exhibits excellent performance for the simultaneously removal of organic pollutants with different charges from water. The selected three model pollutants, Rhodamine B (RhB, positively charged), Sulfamethazine (SMT, electrically neutral) and Fulvic acid (FA, negatively charged), could be rapidly and efficiently removed from water by QPBP [5] within 10 min, which are much faster than them by most of the reported adsorbents. RhB and SMT are mainly adsorbed through hydrophobic interactions with the QPBP [5] surface, while FA is mainly removed through ion exchange. In addition, QPBP [5] also showed excellent reusability and adsorption performance for the environmentally relevant concentration of pollutants. Furthermore, the quaternary ammonium groups on QPBP [5] makes it a solid disinfectant with excellent antibacterial properties. In conclusion, QPBP [5] is a promising multifunctional adsorbent for the treatment of complex pollutants in water. © 2023 Elsevier Ltd

关键词： Adsorption

Cufe2o4@Ncnts-Functionalized Ceramic Microfiltration Membrane for Antibiotic Oxidation and Fouling control Via Heterogeneous Electro-Fenton Reaction

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SSRN 2024年

作者： Zhang, Zixin Huang, Guohe Li, Yongping Yao, Yao Zhang, Peng Chen, Xiujuan Ren, Shaojie Luo, Yifei Zhang, Yuanzheng State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China State Key Joint Laboratory of Environmental Simulation and Pollution Control China-Canada Center for Energy Environment and Ecology Research UR-BNU School of Environment Beijing Normal University Beijing100875 China Environmental Systems Engineering Program University of Regina ReginaSKS4S 0A2 Canada Institute for Energy Environment and Sustainable Communities University of Regina ReginaS4S 0A2 Canada Department of Civil Engineering The University of Texas at Arlington ArlingtonTX United States Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao266237 China College of Environmental Science and Engineering North China Electric Power University Beijing102206 China

Herein, we reported an electrocatalytic ceramic microfiltration membrane functionalized with CuFe2O4 nanoparticles supported by nitrogen-doped carbon nanotubes (NCNTs). The synergistic catalysis between Fe and Cu induced a continuous ·OH generation. The active Fe(II) and Cu(I) sites decomposed the in-situ generated H2O2 into ·OH. The electron transfer from the external circuit and Cu(I) to Fe(III) drove the regeneration of Fe(II). The interfacial electron transfer from CuFe2O4 to NCNTs decreased the electron density of Fe and Cu, thus facilitating the redox cycles of Fe(III)/Fe(II) and Cu(II)/Cu(I). Furthermore, the Fe and Cu sites at the interface of CuFe2O4 and NCNTs displayed a superior ability to non-interface sites in producing ·OH. At near-neutral pH, the electrocatalytic membrane delivered excellent tetracycline removal kinetics (0.0134 min-1) and significantly alleviated the organic fouling occurring on the membrane. These findings shed new light on the development of new-generation membranes with catalytic oxidation capabilities for water treatment. © 2024, The Authors. All rights reserved.

关键词： Antibiotics

Heterogeneous Fe(Iv)=O Mediated Fenton-Like Process on Fe-Zr Heterojunction for Selective Oxidation of Organic Pollutants at Near Neutral Ph

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SSRN 2022年

作者： Yin, Yue Li, Mingyang Li, Xiaoyang Zhang, Weiming Lv, Lu Junfeng, Wan Wang, Yan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China School of Ecology and Environment Zhengzhou University Zhengzhou450001 China Nanjing University Nanjing210023 China State Environmental Protection Engineering Center for Organic Chemical Wastewater Treatment and Resource Reuse Nanjing210046 China

Hydroxyl radicals (HO), singlet oxygen (1O2) or free high-valent iron oxo species (i.e., Fe(IV)=O) were consider to be the reactive oxide species (ROS) formed in iron-based Fenton-like process, while only sporadic evidence to support the formation of heterogeneous Fe(IV)=O (≡Fe(IV)=O). Herein, we report a remarkable ≡Fe(IV)=O mediated Fenton-like process on (1 1 0)-(1 0 0) heterojunction of Fe-Zr bimetallic oxide under near-neutral conditions. The formation of heterojunction shortened the Fe-O bond length by 0.14 Å and increased the binding energy of Fe 2p3/2 orbital by 0.8 eV on Fe-Zr (1 1 0)-(1 0 0) interface, compared with that on Fe2O3 (1 1 0) facet. This will promote the cyclic complexes of Fe(II)-[OOH]+ formation on Fe-Zr (1 1 0)-(1 0 0) interface. Besides, energy barrier of Fe(II)-[OOH]+ on (1 1 0)-(1 0 0) heterojunction was 10.6 kJ mol-1 lower than that on Fe2O3 (1 1 0) facet. And it will facilitate the inner two-electron transfer process, thereby generating ≡Fe(IV)=O with high-efficiency selective oxidation ability. This work represents a breakthrough toward the structure-performance relationship between heterojunction structure and ≡Fe(IV)=O formation, and it will enlighten the selective oxidation of pollutants in wastewater treatment. © 2022, The Authors. All rights reserved.

关键词： Heterojunctions

Emission, Distribution and Formation Characteristics of Polybrominated Dibenzo-P-Dioxins and Dibenzofurans (Pbdd/Fs) During Co-Disposal of Hexabromocyclododecane (Hbcd)-Containing Waste in Cement Kiln

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SSRN 2024年

作者： Wang, Jian Lin, Bingcheng Wang, Xiao Liu, Guorui Jin, Rong Xiong, Jukun Guo, Jianping Li, Yinming Zheng, Minghui School of Environment Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and Engineering Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou510006 China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China College of Resource and Environment University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Solid Waste Reuse for Building Materials Beijing Building Materials Academy of Science Research Beijing100041 China

Hexabromocyclododecane (HBCD)-containing waste was co-disposed in a cement kiln to evaluate its destruction removal efficiency (DRE) and its impact on polybrominated dibenzo-p-dioxins and dibenzofurans (PBDD/Fs) formation. The DRE of HBCD exceeded 99.9999%, with β-HBCD as the main residual isomer, suggesting its potential as a source tracer for HBCD in the environment. Stack gas at kiln head and tail exhibited average PBDD/Fs emission levels of 364.5 and 423.0 pg Nm-3, respectively, with octa-BDD predominating. However, in the kiln tail bag filter, hexa-BDF and hepta-BDF were secondarily generated through de novo synthesis, leading to an increase in PBDD/Fs concentration. Notably, most HBCD underwent debromination and ring-opening in the calciner, with released bromine absorbed and removed by CaO before entering the rotary kiln. Decomposition products such as polycyclic aromatic hydrocarbons, biphenyls and their derivatives served as carbon sources for PBDD/Fs synthesis. Emission factors of HBCD and PBDD/Fs were the highest in the clinker at 1.31×106 and 1.11×105 ng t-1, respectively. Therefore, attention is needed for the potential secondary release of pollutants during the transportation and utilization of clinker. These findings enhance understanding of the distribution and formation pathways of PBDD/Fs during cement kiln co-processing, providing insights for the source control of PBDD/Fs. © 2024, The Authors. All rights reserved.

关键词： Polycyclic aromatic hydrocarbons

Chronic exposure to 3,6-dichlorocarbazole exacerbates non-alcoholic fatty liver disease in zebrafish by disrupting lipid metabolism and inducing special lipid biomarker accumulation

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Chemosphere 2024年 352卷 141442页

作者： Hou, Cunchuang Huang, Mengyao Wang, Pingping Zhang, Qiaoyun Wang, Guowei Gao, Shixiang School of Environmental Ecology and Biological Engineering Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of Technology Wuhan 430205 China Department of Human Microbiome & Implantology & Orthodontics School and Hospital of Stomatology Cheeloo College of Medicine Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration Jinan 250012 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China

Most previous studies have focused primarily on the adverse effects of environmental chemicals on organisms of good healthy. Although global prevalence of non-alcoholic fatty liver disease (NAFLD) has reached approximately 25%, the impact of environmentally persistent organic chemicals on organisms with NAFLD is substantially unknown. Polyhalogenated carbazoles (PHCZs) as emerging contaminants have been frequently detected in the environment and organisms. In this study, we investigated the impact of the most frequently detected PHCZs, 3,6-dichlorocarbazole (36-CCZ), on zebrafish with high-fat diet (HFD)-induced NAFLD. After 4 weeks exposure to environmentally relevant concentrations of 36-CCZ (0.16–0.45 μg/L), the accumulation of lipid in zebrafish liver dramatically increased, and the transcription of genes involved in lipid synthesis, transport and oxidation was significantly upregulated, demonstrating that 36-CCZ had exacerbated the NAFLD in zebrafish. Lipidomic analysis indicated that 36-CCZ had significantly affected liver lipid metabolic pathways, mainly including glycerolipids and glycerophospholipids. Additionally, fifteen lipids were identified as potential lipid biomarkers for 36-CCZ exacerbation of NAFLD, including diacylglycerols (DGs), triglycerides (TGs), phosphatidylcholines (PCs), phosphatidylethanolamines (PEs), phosphatidic acid (PA), and phosphatidylinositol (PI). These findings demonstrate that long-term exposure to 36-CCZ can promote the progression of NAFLD, which will contribute to raising awareness of the health risks of PHCZs. © 2024 Elsevier Ltd

关键词： Adverse effects Histological analysis Lipidomic analysis Persistent organic pollutants Polyhalogenated carbazoles

A green sulfidated micro zero-valent iron based-hydrogel for the synergistic removal of heavy metal cations and anions in groundwater

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Science of the Total Environment 2025年 972卷 179096页

作者： Wang, Tingting Wang, Zhewen Shi, Junxiang Yin, Ying Du, Wenchao Wu, Jichun Guo, Hongyan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China School of Environment Nanjing Normal University Nanjing210036 China School of Earth Sciences and Engineering Nanjing University Nanjing210023 China Quanzhou Institute for Environment Protection lndustry Nanjing University Quanzhou362000 China Joint International Research Centre for Critical Zone Science-University of Leeds and Nanjing University Nanjing University Nanjing210023 China

Heavy metal cations and anions contaminated groundwater was a big challenge to water resource safety. Herein, a green sulfidated micro zero-valent iron-based hydrogel (SA-S-mZVI) was synthesized using sodium alginate biomass for the simultaneous removal of heavy metal cations (Cu(II), Pb(II), Cd(II)) and anions (Cr(VI)). The sulfur modification and incorporation of sodium alginate hydrogel facilitated the efficient and sustainable removal of both single and multi-heavy metals. The co-existing heavy metal cations benefited the removal of Cr(VI), and heavy metals were mostly transformed into stable precipitates. The presence of organic substance and ions slightly affected the removal of heavy metals. Long-term column experiments (240 days) showed that SA-S-mZVI maintained over 99.9 % removal efficiency for heavy metal cations and anions, without adverse impacts on the groundwater environment. This study provided new insights into the development of eco-friendly, long-lasting zero-valent iron-based hydrogels for in-situ remediation of heavy metals-contaminated groundwater. © 2025

关键词： Groundwater pollution

Effects of disturbance modes and carbon sources on the physiological traits and nutrient removal performance of microalgae (S. obliquus) for treating low C/N ratio wastewater

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Chemosphere 2024年 347卷 140672页

作者： Zhao, Xin Lu, Shaoyong Guo, Xiaochun Wang, Ruigang Li, Ming Fan, Chunzhen Wu, Haiming State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China College of Water Sciences Beijing Normal University Beijing100875 China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science & Engineering Shandong University Qingdao266237 China Shanxi Laboratory for Yellow River College of Environmental and Resource Sciences Shanxi University Taiyuan030006 China College of Resources and Environment Northwest A&F University Shaanxi Yangling712100 China National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution Key Laboratory of Zhejiang Province for Water Environment and Marine Biological Resources Protection College of Life and Environmental Science Wenzhou University Wenzhou325000 China

Wastewater treatment with microalgae is an ecologically sustainable process. In this study, the growth characteristics, nutrient removal, and spectral changes of dissolved organic matter (DOM) in microalgae bioreactors were investigated for treating low C/N ratio wastewater under different disturbance modes (agitation and aeration) and carbon sources (sucrose and humic acid). The results showed that the biomass and chlorophyll-a contents of Scenedesmus obliquus in the aeration condition (725.32–811.16 × 104 cells mL−1, 1.58–1.69 mg L−1) were higher than those in the agitation condition (426.06–465.14 × 104 cells mL−1, 1.48–1.61 mg L−1). The better removal of nutrients (TN, 29.62–36.39 mg L−1, TP, 1.84–2.30 mg L−1) by microalgae in sucrose-containing wastewater under agitation conditions occurred on the second day, with removal efficiencies of 21.33–30.67% and 44.84–58.51%, respectively;while it was on the fifth day both in sucrose and humic acid-containing wastewater under aeration conditions (TN, 19.56–31.20 mg L−1, TP, 0.26–0.30 mg L−1), with removal efficiencies of 13.92–46.75% and 88.36–90.50%, respectively. The wastewater DOM primarily consisted of humic-like substances under agitation and aeration conditions characterized by high levels of aromaticity, molecular weight and humification. Furthermore, the aromatization and humification properties of DOM in humic acid wastewater were higher than those in sucrose wastewater, which was corresponding with the lower removal and availability of pollutants by algae. Microalgae showed good biomass accumulation and nutrients removal at incubation time of 2 days (agitation condition) and 5 days (aeration condition), respectively. Consequently, a technical reference is provided for the microalgae coupled with other treatment processes. © 2023 Elsevier Ltd

关键词： Microalgae