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Graphene oxide co-modified by dopamine and nano-TiO 2 with enhanced corrosion resistance and thermal stability

Surfaces and Interfaces 2025年 70卷

作者： Yu Zou Fenghua Shen Kaisong Xiang Lele Liu Haiyang Chen Qu Yang Hui Liu School of Metallurgy and Environment Central South University Changsha 410083 China State Key Laboratory of Advanced Metallurgy for Non-ferrous Metals Changsha 410083 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Changsha 410083 China Hunan Aerospace Sanfeng Science & Industry Co. Ltd Changsha 410083 China

Graphene oxide (GO) is a widely utilized functional anticorrosive material, whereas the presence of numerous oxygen functional groups on its surface tends to cause agglomeration, leading to decrease in anticorrosive properties. In this study, we designed a modification method by using dopamine and nano-TiO 2 to simultaneously enhance the corrosion resistance and thermal stability of GO. The Tafel curves and EIS tests demonstrate that GO modified with dopamine and nano-TiO 2 exhibits superior corrosion resistance. This can be attributed to the adhesive polydopamine formed through the self-polymerization of dopamine, which wraps around the surface of GO, resulting in better dispersion and uniformity of nano-TiO 2 . Additionally, TiO 2 serving as a passivation film enhances the barrier properties of the material. Furthermore, dopamine and nano-TiO 2 effectively cover the C O groups on GO surface, significantly improving its corrosion resistance. Besides, the thermal stability of GO is enhanced due to nano-TiO 2 possessing excellent thermal stability. The enhancement in both corrosion resistance and thermal stability of GO through dopamine and nano-TiO 2 modification is closely related to the amount of added nano-TiO 2 . This work provides valuable insights for simultaneously enhancing both thermal stability and corrosion resistance of GO.

关键词： Corrosion resistance Dopamine Graphene oxide Nano-TiO2 Thermal stability

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Photogenerated-hole scavenger for enhancing photocatalytic chalcopyrite bioleaching

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Transactions of Nonferrous metals Society of China 2020年第1期30卷 200-211页

作者： Bao-jun YANG Wen LUO Qi LIAO Jian-yu ZHU Min GAN Xue-duan LIU Guan-zhou QIU School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Biohydrometallurgy of Ministry of Education Central South UniversityChangsha 410083China The Second Xiangya Hospital of Central South University Changsha 410011China Chinese National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution Central South UniversityChangsha 410083China

The effects of photogenerated-hole scavengers(ascorbic acid,oxalic acid,humic acid and citric acid)on chalcopyrite bioleaching in the presence of visible light were studied using Acidithiobacillus ferrooxidans(***).Four sets of bioleaching experiments were performed:(1)visible light+0 g/L scavenger,(2)visible light+0.1 g/L of different scavenger(ascorbic acid,oxalic acid,humic acid and citric acid),(3)dark+0.1 g/L of different scavenger(ascorbic acid,oxalic acid,humic acid and citric acid),and(4)dark+0 g/L scavenger(control group).The results showed that ascorbic acid and oxalic acid could act as photogenerated-hole scavengers and significantly enhance chalcopyrite bioleaching under visible *** dissolved copper in the light group without scavenger was only 18.7%higher than that of the control *** copper extraction rates of the light groups with oxalic acid and ascorbic acid were respectively 30.1%and 32.5%higher than those of the control *** electron microscopy(SEM),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR)analyses indicated that ascorbic acid and oxalic acid as photogenerated-hole scavenger could capture photo-generated holes and inhibit jarosite formation on the chalcopyrite surface,thereby enhancing bioleaching of chalcopyrite under visible light.

关键词： bioleaching chalcopyrite photogenerated-hole scavenger visible light Acidithiobacillus ferrooxidans

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Bioleaching of low-grade copper sulfide ore by extremely thermoacidophilic consortia at 70℃in column reactors

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Journal of Central South University 2020年第5期27卷 1404-1415页

作者： AI Chen-bing LIANG Yu-ting QIU Guan-zhou ZENG Wei-min School of Metallurgy and Environment Central South UniversityChangsha 410083China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Central South UniversityChangsha 410083China Key Laboratory of Biohydrometallurgy of Ministry of Education Central South UniversityChangsha 410083China

The effects of introducing *** derivatives having different Cu^2+-resistance on bioleaching capacity of a defined consortium(consisting of *** DSM1651 and *** HO1-1)were studied in column reactors at 70℃.Introducing *** copA mutant,a copper sensitive derivative,only had negligible effects on *** introducing *** ARS50-2,a Cu^2+resistant strain,substantially consolidated bioleaching process,with 27.77%more copper recovered after 58 d of *** of *** ARS50-2 likely enhanced the sulfur oxidation capacity of consortium after the 24th day under the Cu^2+*** majority of extreme thermoacidophiles were attached on minerals surface as indicated by quantitative PCR(qPCR)*** of microbial community of extremely thermoacidophilic consortia that attached on surface of minerals were different from those in *** HO1-1 was the dominant species attached on minerals surface in each column reactor throughout bioleaching *** sessile *** ARS50-2 remained as a major species till the 34th *** DSM1651 was the most abundant planktonic species in leachate of each column *** results highlight that higher Cu^2+-resistance is a beneficial trait for extreme thermoacidophiles to process copper minerals.

关键词： extreme thermoacidophile bioleaching copper sulfide ore copper resistance microbial community

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Removal of Cd and Pb with biochar made from dairy manure at low temperature

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Journal of Integrative Agriculture 2019年第1期18卷 201-210页

作者： CHEN Zhi-liang ZHANG Jian-qiang HUANG Ling YUAN Zhi-hui LI Zhao-jun LIU Min-chao Guangdong Engineering Technology Research Center of Heavy Metal Pollution Control and Restoration in Farmland Soil South China Institute of Environmental Sciences School of Environment and Chemistry Wuyi UniversityJiangmen Key Laboratory of Plant Nutrition and Fertilizer Ministry of Agriculture/China-New Zealand Joint Laboratory for Soil Molecular EcologyInstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural Sciences

Biochar(BC) derived from waste products is a cost-effective sorbent for remediation of metal-contaminated *** studied the kinetics and adsorption mechanisms for removal of metal ions,such as lead(Pb^(2+)) and cadmium(Cd^(2+)) with *** adsorption capacities of BC for Pb^(2+) and Cd^(2+) increased after alkaline *** highest sorption capacities were 175.53 and 68.08 mg g^(–1),for Pb and Cd,*** Langmuir adsorption isotherm and pseudo second kinetic equation could well fit the adsorption processes,revealing that the sorption mechanisms of Pb^(2+) and Cd^(2+) by BC are complex and predominantly controlled by *** has a higher affinity for Pb than Cd,due to easy hydrolysis of Pb at low ***,precipitation as carbonate minerals(2PbCO_3·Pb(OH)_2 and CdCO_3) and complexation with functional groups(carboxyl and hydroxyl) were also important for adsorption of Pb and Cd by BC.

关键词： biochar kinetics isotherms Pb Cd

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Biological denitrification driven by hydrochar: Insight into the mechanism from intracellular and extracellular electron transfer

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Journal of Environmental Chemical Engineering 2025年第4期13卷

作者： Shengjie Chen Zequan Cao Zhu Wang Qing Yong Wei Peng Fubing Yao Kun Luo Bo Li Dongbo Wang Xiaoming Li Qi Yang College of Environmental Science and Engineering Hunan University Changsha 410082 PR China Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 PR China School of Metallurgy and Environment Central South University Changsha 410083 PR China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Changsha 410083 PR China Department of Materials and Environmental Engineering Changsha University Changsha 410003 PR China School of Environment and Energy South China University of Technology Guangzhou 510006 PR China

Hydrochar (HC), a typical biochar is found to enhance the biological denitrification, but its intrinsic mechanism, especially under carbon source limitation, remains understudied. In this study, the effects of HCs prepared from banana peel, rice straw and pine, as well as their HC-derived dissolved substance (HC-DS) and HC-DS-removed residual biochar (R-HC) on denitrification were investigated at low carbon-nitrogen ratio (C/N = 1). The results showed that the denitrification was promoted by all HCs with the efficiency ranking as HC>R-HC>HC-DS>Blank. Notably, the HC derived from banana peel (BP) exhibited superior performance. The addition of 1 g/L HC derived from BP and its R-HC enabled the complete reduction of 50 mg/L nitrate within 40 and 48 h, respectively. However, residual nitrate remained as high as 12.47 and 23.48 mg/L for its HC-DS and Blank experiments, even after 60 h. Mechanistic analysis revealed that HC could modulate the intracellular electron transfer (IET) during denitrification. Specifically, HC enhanced the supply and accelerated the transfer of electron, optimizing the Embden-Meyerhof pathway (EMP), the tricarboxylic acid (TCA) cycle and the pentose phosphate pathway (PPP), exerting a direct reinforcing effect on intracellular nitrogen metabolism. Simultaneously, HC also enhanced the extracellular electron transfer (EET) through increasing the production of electroactive substances including type IV pilus and cytochrome c. In such mechanism, R-HC played a pivotal role in IET and EET, whereas HC-DS played a comparatively less significant role. This study provides insights into HC's role in enhancing denitrification and offers a new strategy to control nitrogen pollution in aquatic ecosystems.

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Catalyst and gas diffusion electrode design toward C–N coupling for urea electrosynthesis

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eScience 2025年

作者： Jiping Sun Bichao Wu Guangchao Li Zhixing Wang Xinhai Li Huajun Guo Guochun Yan Hui Duan Wenchao Zhang Min Liu Jiexi Wang School of Metallurgy and Environment Central South University Changsha 410083 China National Energy Metal Resources and New Materials Key Laboratory Engineering Research Center of the Ministry of Education for Advanced Battery Materials Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy Central South University Changsha 410083 China National Engineering Research Centre of Advanced Energy Storage Materials Changsha 410205 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Central South University Changsha 410083 China Department of Physics Central South University Changsha 410083 China

The electrocatalytic C–N coupling reaction involving carbon dioxide (CO 2 ) and nitrogenous small molecules has recently emerged as a subject of considerable interest within the field of urea synthesis. This approach has the potential to facilitate the clean, sustainable production of urea, thereby contributing to the attainment of carbon neutrality and the advancement of artificial nitrogen cycling. Nevertheless, electrocatalytic urea synthesis still faces significant challenges due to the difficulty of balancing the co-activation of carbon and nitrogen sources and the subsequent catalytic C–N coupling of in situ-generated species, as well as competing reactions. To overcome these challenges, there is a growing emphasis on the research of gas diffusion electrodes (GDEs) and the design of electrode materials. This article provides a comprehensive review of the C–N coupling mechanisms, the classification of catalysts, the electrocatalyst design and optimization strategies, and the fundamental functions and importance of GDEs in electrocatalytic C–N coupling reactions. It also provides insights and perspectives on the major challenges and future research directions for GDEs and electrocatalysts in electrocatalytic urea synthesis.

关键词： C–N coupling Urea synthesis Gas diffusion electrode Catalyst design

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Deep insight of the efficiency and fouling mechanisms in reciprocating and biogas sparging anaerobic membrane bioreactor for food waste digestion

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Chemical Engineering Journal 2025年 518卷

作者： Muxiang Liang Jing Chen Qian Li Xiaohui Wu Min Zheng Feixiang Zan Guanghao Chen School of Environmental Science and Engineering Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin Huazhong University of Science and Technology Wuhan 430074 China Key Lab of Northwest Water Resource Environment and Ecology MOE Xi'an University of Architecture and Technology Xi'an 710055 China Water Research Centre School of Civil and Environmental Engineering University of New South Wales Sydney New South Wales 2052 Australia School of Civil and Environmental Engineering Water Technology Center Hong Kong Branch of Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution The Hong Kong University of Science & Technology Hong Kong China

Anaerobic membrane bioreactors (AnMBRs) offer a promising solution for high-solid organic waste digestion, but their widespread application is limited by severe membrane fouling. This study investigates the fouling mechanisms in a novel reciprocating AnMBR (rAnMBR) compared to a conventional biogas sparging AnMBR (sAnMBR) under increasing organic loading rates (OLR) from 2 to 6 g COD/L/d, with a corresponding reduction in hydraulic retention time to 11.7 days. Both systems exhibited similar methanogenic performance; however, the rAnMBR demonstrated significantly better fouling resistance, maintaining filtration for 33 and 20 days at low and high OLRs, respectively, whereas the sAnMBR fouled within 11 and 4 days. Sludge characterization revealed that the rAnMBR retained a higher fraction of microparticles (1.5–10 μm), which reduced sludge filterability. Particle image velocimetry showed improved hydrodynamics in the rAnMBR, leading to slower and more uniform cake layer formation. Microbial analysis indicated distinct communities between the systems, with the rAnMBR favouring filamentous and helix-shaped bacteria, potentially contributing to its observed fouling behaviour. These findings suggest that reciprocation, as a self-antifouling strategy, is a viable alternative for mitigating membrane fouling in high-solid food waste digestion, offering improved operational stability and lower maintenance costs. This study provides valuable insights for optimizing AnMBR design and advancing sustainable waste-to-energy technologies.

关键词： Sludge digestion

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Polyaniline-modified cathode interface for enhanced mercury electroreduction recovery

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Separation and Purification Technology 2025年 371卷

作者： Chen, Hao Bao, Ding Shen, Fenghua Wu, Jun He, Dejun Shen, Zongxi Lu, Zhanqing Xiang, Kaisong Liu, Hui 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 Center for Control & Treatment of Heavy Metal Pollution Changsha410083 China Yunnan Keli Environmental Protection Co. Ltd. Kunming650031 China Yunnan Chihong Zinc & Germanium Co. Ltd. Qujing655011 China

Electroreduction is a critical process for the clean utilization of mercury-containing waste through hydrometallurgical methods. However, insufficient mercury supply at the cathode-electrolyte interface in chlorine-containing solution limits the reduction rate. Here, we propose a strategy to enhance mercury ion enrichment and reduction rates by modifying the cathode with the conductive polymer polyaniline (PANI). In a flow cell, the PANI-modified carbon paper (PANI@CP) electrode achieved an average mercury yield of 16.8 mg·h−1·cm−2, a Faradaic efficiency of 84.1 %, and a recovery of 84.2 % over five electrolysis cycles, with improvements of 55.6 %, 11.9 %, and 30.1 %, respectively, compared to the bare electrode. Mechanism study revealed that the protonated amine groups in PANI facilitated the adsorption and dissociation of mercury chloride complexes, such as [HgCl4]2−. Additionally, the imine groups in quinoid units and the amine groups in benzenoid units acted as strong binding sites for Hg2+. The synergistic action of various nitrogen-containing functional groups increased the mercury concentration at the cathode interface, reduced the apparent activation energy of the reduction process, and enhanced mercury recovery. This study not only provides a novel approach for efficient electrochemical mercury recovery but also offers a deep insight into the interface modification for enhancing metal electrodeposition. © 2025 Elsevier B.V.

关键词： Polyaniline

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Accelerated Degradation of Microplastics at the Liquid Interface of Ice Crystals in Frozen Aqueous Solutions

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Angewandte Chemie 2022年第31期134卷

作者： Dr. Chen Tian Jiaxin Lv Prof. Wenchao Zhang Dr. Han Wang Jin Chao Prof. Liyuan Chai Prof. Zhang Lin School of Metallurgy and Environment Central South University Changsha 410083 China School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling South China University of Technology Guangzhou Guangdong 510006 China Chinese National Engineering Research Centre for Control & Treatment of Heavy Metal Pollution Changsha 410083 P. R. China

Microplastics (MPs) are one of the emerging contaminants in environmental media, and they have raised great concern because they are resistant to degradation and persist in ecosystems. Although numerous advanced technologies have been developed, suitable technologies are still lacking for degradation of widespread MPs in the natural environment. We have discovered that MPs can be degraded exceptionally rapidly in frozen environments. Taking polystyrene (PS) as an example, its degradation rate in ice (−20 °C) is surprisingly competitive to most artificial technologies. PS particles are trapped and squeezed to achieve excited state ( 3 PS*) in the narrow space of the liquid layer between ice crystals, which further react with the highly concentrated dioxygen to selectively produce singlet oxygen ( 1 O 2 ). The 1 O 2 boosts PS oxidation in the liquid layer thus further causing accelerated degradation at freezing temperature. This finding offers a highly efficient pathway for degradation of MPs and it sheds light on an unusual MPs disposal mechanisms in nature.

关键词： Accelerated Degradation Freezing Microplastics Reactive Oxygen Species

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Advances in Z-scheme and S-scheme heterojunctions for photocatalytic and photoelectrocatalytic H 2 O 2 production

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Chinese Chemical Letters 2025年

作者： Xibao Li Yiyang Wan Fang Deng Yingtang Zhou Pinghua Chen Fan Dong Jizhou Jiang National-Local Joint Engineering Research Center of Heavy Metal Pollutants Control and Resource Utilization Nanchang Hangkong University Nanchang 330063 China Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine Aquaculture Marine Science and Technology College Zhejiang Ocean University Zhoushan 316004 China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China School of Materials Science and Engineering State Key Laboratory of Green and Efficient Development of Phosphorus Resources Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Key Laboratory of Green Chemical Engineering Process of Ministry of Education Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Novel Catalytic Materials of Hubei Engineering Research Center Wuhan Institute of Technology Wuhan 430205 China

Photocatalytic and photoelectrocatalytic H 2 O 2 production has been identified as a significant pathway within environmental pollution control, green energy, medical treatment, sterilization and disinfection. However, conventional single-material photocatalysts struggle to fulfill the stringent criteria of high efficiency, stability, cost-effectiveness, and responsiveness to visible light. The elevated recombination rates of photogenerated charge carriers, coupled with the suboptimal utilization of visible light, have collectively constrained the photocatalytic and photoelectrocatalytic H 2 O 2 production. Heterojunction catalysts for the production of H 2 O 2 has become a focal point of research. This review commences by elucidating the fundaments underlying the photocatalytic and photoelectrocatalytic H 2 O 2 production. Subsequently, it delineates the distinctive electron transfer mechanisms of Z-scheme and S-scheme heterojunctions, which exhibit enhanced efficiency in the photocatalytic and photoelectrocatalytic H 2 O 2 production, along with a summary of strategies for the improvement of photocatalyst and photoelectrocatalyst performance. Furthermore, this review also outlines the latest fabrication strategies, state-of-the-art in-situ characterization techniques, machine learning and density functional theory (DFT) simulations for Z-scheme or S-scheme catalysts for the photocatalytic and photoelectrocatalytic H 2 O 2 production, and briefly describes the multifunctional applications in H 2 O 2 production. Ultimately, the review contemplates the prospective developmental trajectories and application potential of these heterojunction configurations for the photocatalytic and photoelectrocatalytic H 2 O 2 production.

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