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Outstanding Anti-Bacterial Thin-Film Composite Membrane Prepared by Incorporating Ag-Mof for Water Treatment

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SSRN 2022年

作者： Gong, Ji-Lai Tan, Zi-Kang Fang, Si-Yuan Li, Juan Cao, Wei-Cheng Chen, Zeng-Ping College of Environmental Science and Engineering Hunan University Changsha410082 China Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha410082 China State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants Changsha410082 China State Key Laboratory for Chemo/Biosensing and Chemometrics College of chemistry and Chemical Engineering Hunan University Changsha410082 China

Biofouling was a considerable issue in the water treatment by membrane technology. In this study, high anti-bacterial property Ag-MOF was synthesized followed by embedding into polyamide layer with vacuum-assisted interfacial polymerization process to prepare an Ag-MOF incorporated nanofiltration membrane. The successful preparation of Ag-MOF and membranes was verified by FT-IR, FESEM, XPS, XRD and contact angle test. On account to the strong hydrophility, porous structure, electronegativity and antibacterial property of Ag-MOF, modified membranes showed excellent performance to dyes solution and bacterial suspension. The water permeability of modified membranes was increased to 14.31 L m-2 h-1 bar-1 and the rejection rate of MO, MB and RB of the optimum membranes were 95.43%, 87.82% and 99.30%, respectively. The plate count method and inhibition zone experiment demonstrated the sterilization rate of modified membranes exceeded to 99%. The leaching test of Ag+ evaluated the potential mechanism of anti-bacterial property. Moreover, dynamic bio-fouling test were used to detect the actual status in the filtration process. Those results suggested that modified membranes showed a strong resistance to bio-foulants thus enlarged the scope of application of membranes for water treatment. © 2022, The Authors. All rights reserved.

关键词： Thin films

Sandwich-Structured Membrane Decorated with Amino-Functionalized Zr-Mofs: Toward Enhancement of Antibiotic Separation and Organic Solvent Resistance

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SSRN 2022年

作者： Fang, Si-Yuan Gong, Ji-Lai Tang, Lin Cao, Wei-Cheng Li, Juan Tan, Zi-Kang Wang, Yuwen Chen, Zeng-Ping Wang, Wenbo Key Laboratory of Environmental Biology and Pollution Control College of Environmental Science and Engineering Hunan University Changsha410082 China State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants Changsha410082 China Shenzhen Institute Hunan University Shenzhen518000 China State Key Laboratory for Chemo/Biosensing and Chemometrics College of chemistry and Chemical Engineering Hunan University Changsha410082 China

Zirconium-based metal-organic frameworks (Zr-MOFs) are of wide public concern in nanofiltration owing to their sizeable porosities and modulable functions. However, Zr-MOFs agglomeration or surface defects formation in thin-film nanocomposite (TFN) membrane restricted their further development. Herein, we designed a sandwich-structured membrane featuring amino-functionalized Zr-MOFs incorporated polyamide film formed on tannic acid/polyethyleneimine (TA-PEI) interlayer that constructed by Michael addition/Schiff base reaction in a porous substrate. As the TFN-2 membrane had higher stability and hydrophilicity, the water permeance is 187.23 ±7.43 L m -2 h -1 bar -1 that is more than double the TFC membrane (74.57±9.88 L m -2 h -1 bar -1 ). Its rejection against norfloxacin, ciprofloxacin, and levofloxacin is 92.9±1.60%, 94.6±1.29%, and 96.9±1.05%. Further organic solvent resistance tests confirmed the sandwich-structured membrane maintained stable solvent permeances and levofloxacin rejection in ethanol, acetone, isopropanol, and N, N-dimethylformamide. In addition, the nanofiltration mechanism was investigated combining characteristics and experiments, which was delivered by TA-PEI interlayer and UiO-66-NH 2 through constructed gutter layer, limited pore infiltration, elevated membrane electronegativity, and built accelerated water transportations. We believe this rational design strategy is expected to open a new prospective toward developing next-generation nanofiltration membranes for wastewater reclamation. © 2022, The Authors. All rights reserved.

关键词： Nanofiltration

Insights into Nano Zero Valent Iron (Nzvi) Activation of Sludge Derived Biochar for Removing Cr(Vi) from Aqueous Solution

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SSRN 2022年

作者： Huang, Xuyin Niu, Xiaojun Zhang, Dongqing Li, Xiaoqin Li, Haoshen Wang, Ziyuan Lin, Zhang Fu, Mingli School of Environment and Energy South China University of Technology Guangzhou510006 China Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control School of Environmental Science and Engineering Guangdong University of Petrochemical Technology Maoming525000 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution School of Metallurgy and Environment Central South University Changsha410083 China

In this study, the biochars (BCs) derived from activated sludge was synthesized by nano zero valent iron (nZVI) and employed as an efficient adsorbent for hexavalent chromium (Cr(VI)) removal from aqueous solution. Characterization of nZVI-BC was carried out using SEM, BET, XRD, FTIR, Raman and XPS analyses. The embedded nZVI contributed to enlarging the surface area of nZVI-BC (107.62 m2/g), compared to the unmodified biochar (25.17 m2/g). The maximum adsorption capacity of nZVI-BC on Cr(VI) was 172.41 mg/g, which was significantly higher than that of the pristine one (11.74 mg/g). The results of adsorption kinetics and isotherms showed that chemisorption was dominant by monolayer coverage as rate-limiting step of Cr(VI) the adsorption onto nZVI-BC. The electrostatic attraction between the positively charged BC and the oxygen-containing anion Cr(VI) plays a vital role in Cr(VI) adsorption. The Cr(VI) was reduced by the Fe(0) and Fe(II) on nZVI-BC surface, resulting in the production of Cr(III) and Fe(III). The formation of Fe3O4 and/or FeOOH accompanied by the morphology changes during Cr(VI) removal was essential to the fate and geochemical cycle of iron elements. Additionally, the interaction between nZVI-BC and Cr(VI) was also enhanced by the complexation of surface functional groups. This manuscript demonstrated that nZVI-BC had a promising application prospect in the treatment of Cr(VI)-contaminated wastewater. © 2022, The Authors. All rights reserved.

关键词： Adsorption

Development Potential of Green Gold metallurgy in China

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Strategic Study of CAE 2025年第2期27卷 205-215页

作者： Liyuan, Chai Xu, Yan Hongying, Yang Yunyan, Wang Linlin, Tong Haiying, Wang Meiqing, Shi Wenwen, Han School of Metallurgy and Environment Central South University Changsha410083 China State Key Laboratory of Advanced Metallurgy for Non-ferrous Metals Changsha410083 China Chinese National Engineering Research Centre for Control & Treatment of Heavy Metal Pollution Changsha410083 China School of Metallurgy Northeastern University Shenyang110819 China

Gold is a scarce type of global strategic resources. The gold industry needs to follow the trend of green, low-carbon, and intelligent development, and promote its high-quality development through green metallurgy. The development of green metallurgical technologies and the innovation in cyanide tailing treatment technologies are closely related and complementary, together constituting the core content for the green transformation of the gold industry. From the perspectives of resource constraints, environmental challenges, and scientific and technological application, this study analyzes the demand and industry overview of China’s gold industry, sorts out the research and application progress of green technologies regarding gold metallurgy from both international and domestic perspectives, and further discusses the current status and technical application of cyanide tailing treatment in the gold industry. Considering the current status of the gold industry, the study identifies the development potentials of green gold metallurgy. Specifically, non-ferrous-associated gold smelting and secondary resource recycling are two important directions to break the limitations of traditional gold resources;high-end new materials are key for industrial upgrading under the manifestation of gold’s scientific and technological attributes;intelligent transformation is a strategic path for the production mode innovation and efficiency improvement of the gold industry;and industrial integration and clustering is the preferred solution for ecological reconstruction and collaborative innovation of the industry. Furthermore, it is recommended to enhance the safe utilization and ecological consumption of gold cyanide tailings, strengthen the development of gold’s scientific and technological attributes and high-end utilization, and promote the integrated development of non-ferrous metals and the gold industry, thereby ensuring the sustainable development of China’s gold industry. © 2025

关键词： Gold

Novel Strategy for Efficient Recovery of Cuo-Based Multiple-metals from Copper Smelter Dust Toward Co2 Electrocatalytic Reduction

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SSRN 2024年

作者： Li, Ken Li, Qingzhu Zhao, Feiping Chen, Qin Fu, Junwei Xiang, Kaisong Wang, Qingwei Shi, Meiqing Yan, Xu Chai, Liyuan School of Metallurgy and Environment Central South University Changsha410083 China State Key Laboratory of Advanced Metallurgy for Nonferrous Metals Changsha410083 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Changsha410083 China Hunan Joint International Research Center for Carbon Dioxide Resource Utilization School of Physics Central South University Changsha410083 China Zhejiang Normal University China Institute of Environmental Science and Engineering China

Copper smelter dust, a hazardous waste rich in valuable heavy metals, could be considered as a promising resource. This study introduces a new approach that integrates chlorination roasting and cascade condensation to efficiently recover heavy metals from copper smelter dust. The findings demonstrate the successful separation of heavy metals (Cu, Pb, and Zn) as chlorides at nearly 100% efficiency, while also effectively converting trivalent arsenic (As(III)) into pentavalent arsenic (As(V)) and immobilizing it in the roasting residues, thereby reducing environmental risk. Through the utilization of thermogravimetric-mass spectrum analysis and thermodynamic equilibrium calculations, the chlorination process for heavy metals was investigated, revealing both direct and indirect chlorination processes. Additionally, the study resulted in the development of a CuO-based multiple-metals electrocatalyst from the oxidized roasting-recovered heavy metal chlorides, exhibiting significantly enhanced catalytic activity and faradaic efficiency for the electroreduction of CO2 into CO and CH4 compared to pure CuO electrocatalyst under similar electrocatalytic conditions. Overall, this work presents a sustainable and scalable method and new insights for addressing environmental risk while repurposing copper smelter dust. © 2024, The Authors. All rights reserved.

关键词： heavy metals

Enhanced Cr(VI) removal by nanoscale zerovalent iron through biogenic sulfidation:Comparison against corresponding chemical sulfidation

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Cleaner Chemical Engineering 2025年 11卷

作者： Yanni Xi Zheng Peng Zhuang Zhang Zhu Su Yicai Huang Xin Li Xingzhong Yuan Hunan Provincial Key Laboratory of Water Pollution Control Technology Hunan Research Academy of Environmental Sciences Changsha 410002 PR China State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants Changsha 410014 PR China Key Laboratory of Environmental Biology and Pollution Control Ministry of Education College of Environmental Science and Engineering Hunan University Changsha 410082 PR China

This study examines the effects of biogenic sulfidation and chemical sulfidation on the reactivity of nanoscale zerovalent iron (nZVI) for the removal of carcinogenic hexavalent chromium (Cr(VI)). Biogenic sulfidated nanoscale zerovalent iron (BS-nZVI) was synthesised by culturing nZVI with sulphate-reducing bacteria (SRB), while chemically synthesised sulfidated nanoscale zerovalent iron (CS-nZVI) was produced using a Na 2 S solution. Characterisation results indicated that both BS-nZVI and CS-nZVI were coated with FeS x , with BS-nZVI additionally covered by extracellular polymeric substances (EPS) secreted by the SRB. Both BS-nZVI and CS-nZVI exhibited significantly higher Cr(VI) removal efficiencies compared to nZVI, with values of 18.91 mg/g and 18.80 mg/g, respectively, versus 0.095 mg/g for nZVI. These improvements are attributed to the enhanced electron transfer properties of FeS x . In cyclic “sulfidation-Cr(VI) removal” experiments, biogenic sulfidation was found to be more effective than chemical sulfidation in enhancing and reactivating the Cr(VI) removal capacity of nZVI. The EPS associated with S-nZVI provided additional binding sites for co-precipitation of Cr(III)-Fe(III) during Cr(VI) removal, resulting in the formation of a loosely structured Cr(III)-Fe(III)-EPS co-precipitate. This co-precipitate mitigated the hindering caused by dense Cr(III)-Fe(III) passivation layers on electron transfer during Cr(VI) removal and cyclic sulfidation, in contrast to CS-nZVI. This study elucidates the synergistic effects of the coupled SRB-ZVI system for Cr(VI) remediation.

关键词： Biogenic sulfidation Sulphate-reducing bacteria Zerovalent ion Extracellular polymeric substances Chromium

A Mof-Based Trap with Strong Affinity Toward Low-Concentration heavy metal Ions

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SSRN 2022年

作者： Sun, Zhumei Tian, Chen Yang, Tingting Fu, Jie Xu, Huan Wang, Yunyan Lin, Zhang School of Metallurgy and Environment Central South University Changsha410083 China School of Environmental and Safety Engineering North University of China Shanxi030051 China School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling South China University of Technology Guangdong Guangzhou510006 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Changsha410083 China

The low affinity between the target material and low-concentration heavy metal ions makes it difficult to achieve efficient removal and capture. In this study, azine and carboxyl groups were incorporated into a robust metal–organic framework to prepare a novel adsorbent (TMU-4-COOH). These two specific functional groups are analogous to two types of flexible and functional "claw" moieties fixed in TMU-4-COOH, which synergistically enable the simultaneous and efficient removal of both hard and borderline Lewis metal ions. Five types of heavy metal ions were selected for the capture experiments, covering hard (La 3+ , Ce 3+ , Nd 3+ , and UO 2 2+ ) and borderline (Pb 2+ ) Lewis metal ions. Results show that TMU-4-COOH is very effective, with removal efficiencies of >82% for all of heavy metal ions. Mechanism studies show that the synergistic chelation effect of carboxyl and azine groups to heavy metal ions acted as the dominant adsorption force. The highest affinities are 4.35 and 3.35 times that of the adsorbent 2D-N and 2D-COOH with only one functional group. This work develops a broad-spectrum heavy metal ion trap with a strong affinity that may find applications in the field of water pollution control. © 2022, The Authors. All rights reserved.

关键词： metal ions

Roles and Mechanisms of Nzvi@Pbc For Enhanced Anaerobic Digestion of Liquor Brewing Wastewater

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SSRN 2023年

作者： Su, Qingmuke Song, Yunjie Shen, Honghai Du, Yaguang Du, Dongyun Zhang, Tian C. Ma, Mengyu Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution College of Resources and Environmental Science South-Central Minzu University Wuhan430074 China Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education Wuhan430074 China South-Central Minzu University China Civil and Environmental Engineering Department College of Engineering University of Nebraska-Lincoln OmahaNE68182 United States

Recently, biochar derived from various biomass sources has been used successfully as a conductive material to boost methane generation in anaerobic digestion (AD). However, sufficient information is not available on how nano zero-valent iron (nZVI) loaded on pinecone biochar (PBC) (nZVI@PBC) would improve the performance of anaerobic treatment of liquor brewing wastewater (LBW). In this study, innovative nZVI@PBC composites were developed successfully and then used to enhance the AD of LBW in batch reactors. Adding nZVI@PBC in the AD flasks shortened the lag period, sped up the LBW’s hydrolysis, and improved methane production. The nZVI loaded on PBC dissolved during the AD process, and alkaline functional groups were detached from precipitation, leading to reduction of VFA accumulation, enhanced organic waste degradation and adsorption of ammonia and nitrogen. Adding nZVI@PBC in the AD flasks enriched the key microflora in the hydrolysis and methanogenic processes (e.g., Chloroflexi, Acidobacteriota, Caldiserica, and Methanosaeta) and increased the system’s electron transfer system (ETS) activity by 6.6%and 16.5% as well as the conductivity by 10.6% and 40.4% as compared to the reactors added with PBC or the control reactors (without adding additional materials). Overall, this study offers important new insights into how nZVI@PBC addition affects AD performance. © 2023, The Authors. All rights reserved.

关键词： Hydrolysis

metal organic framework‐ionic liquid hybrid catalysts for the selective electrochemical reduction of CO_(2) to CH4

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Chinese Journal of Catalysis 2022年第7期43卷 1687-1696页

作者： Ernest Pahuyo Delmo Yian Wang Jing Wang Shangqian Zhu Tiehuai Li Xueping Qin Yibo Tian Qinglan Zhao Juhee Jang Yinuo Wang Meng Gu Lili Zhang Minhua Shao Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina Jiangsu Key Laboratory for Chemistry of Low‐Dimension Materials Huaiyin Normal UniversityHuaian 223300JiangsuChina Energy Institute and Chinese National Engineering Research Center for Control&Treatment of Heavy Metal PollutionThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

The electrochemical reduction of CO_(2) towards hydrocarbons is a promising technology that can utilize CO_(2) and prevent its atmospheric accumulation while simultaneously storing renewable en‐***,current CO_(2) electrolyzers remain impractical on a large scale due to the low current densities and faradaic efficiencies(FE)on various *** this study,hybrid HKUST‐1 metal‐organic framework‒fluorinated imidazolium‐based room temperature ionic liquid(RTIL)electrocatalysts are designed to selectively reduce CO_(2) to CH_(4).An impressive FE of 65.5%towards CH_(4) at-1.13 V is achieved for the HKUST‐1/[BMIM][PF_(6)]hybrid,with a stable FE greater than 50%maintained for at least 9 h in an H‐*** observed improvements are attributed to the increased local CO_(2) concentration and the improved CO_(2)‐to‐CH_(4) thermodynamics in the presence of the RTIL molecules adsorbed on the HKUST‐1‐derived Cu *** findings offer a novel approach of immobilizing RTIL co‐catalysts within porous frameworks for CO_(2) electroreduction applications.

关键词： CO_(2)electroreduction Methane Room temperature ionic liquid metal organic framework Catalyst design DFT calculation