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Applied Catalysis B: Environmental 2022年 301卷 120757-120757页

作者： Luo, Jun Fan, Changzheng Tang, Lin Liu, Yani Gong, Zhixuan Wu, Tangshan Zhen, Xinlan Feng, Chengyang Feng, Haopeng Wang, Lingling Xu, Liang Yan, Ming Hunan University Changsha410082 China Key Laboratory of Water Pollution Control Technology Hunan Research Academy of Environmental Sciences Changsha410004 China Key Laboratory for Micro-Nano Physics and Technology of Hunan Province School of Physics and Electronics Hunan University Changsha410082 China Energy Materials Computing Center Jiangxi University of Science and Technology Nanchang330013 China

The generation of H+ by active species attacking proton donor (PD) is a key step in photocatalytic H2O2 production (PHP). Deeply analyzing the involved mechanism may be a crucial factor to break through the bottleneck of H2O2 yield. Here, nitrogen-deficient and boron-doped g-C3N4 are synthesized for PHP and the interaction mechanisms between active species and PD are revealed. The prepared photocatalyst exhibits a high H2O2 production rate (455 μM h−1 g−1). The 1O2, •O2- and hole promoted by modification site dominate twelve different reaction mechanisms, respectively. For the oxidation pathways dominated by hole, H2O2 generation is limited by the dissociation of PD or desorption of H+ on catalyst surface. Interestingly, •O2- and 1O2 could directly attack PD, or diffuse into solution to react with PD to produce H2O2 with lower barriers. Moreover, there is a synergistic effect between doped-boron, 1O2 and water bridge, which further reduces the reaction barrier. © 2021 Elsevier B.V.

关键词： Oxygen

Coupling a titanium dioxide based heterostructure photoanode with electroless-deposited nickel-phosphorus alloy coating on magnesium alloy for enhanced corrosion protection

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Journal of Materials Science & technology 2022年第31期126卷 252-265页

作者： Yue Liu Feng Peng Guang-Ling Yang Zhi-Hui Xie Wenxin Dai Yuejun Ouyang Liang Wu Chuan-Jian Zhong Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China Medical Research Center Department of OrthopedicsGuangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol(PVA)Fiber Material Huaihua UniversityHuaihua 418000China College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Department of Chemistry State University of New York at BinghamtonBinghamtonNY13902United States

The utilization of photoelectrochemical cathodic protection(PECCP)enables an indirect corrosion pro-tection of metals with low self-corrosion potential by introducing a metallic nickel ***,the ability to enhance the PECCP efficiency remains challenging because of the inherent property of the ***,this ability is demonstrated by coupling a covalent organic framework(TpBD)dec-orated TiO 2 photoanode(TiO 2/TpBD)with nickel coating on magnesium alloy for an effective corrosion *** composite photoanode showed direct PECCP for the nickel interlayer and indirect corro-sion protection of the magnesium *** composite structure of the nanotube array and the covalent organic framework for the photoanode were confirmed by field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).The en-hanced photoelectrochemical conversion capability and PECCP performance of the nickel-coated Mg alloy were evidenced by the results from electrochemical and photoelectrochemical measurements including Mott-Schottky curves,photoinduced potential variations,and electrochemical impedance spectroscopy(EIS).Lastly,a corrosion protection mechanism is proposed,where the enhanced PECCP efficiency is at-tributed to the formation of a direct Z-scheme heterojunction,which is substantiated by the results from valence band(VB)XPS and electron spin resonance characterizations.

关键词： Magnesium alloy Corrosion Nickel coating Electroless Photoelectrochemical cathodic protection

Preparation of core-shell composite materials capable of slowly releasing phosphate and their remediation performance of uranium-contaminated groundwater

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Chemosphere 2023年 344卷 140160页

作者： Sheng, Liangbing Zhang, Hui Ma, Jianhong Ding, Dexin Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy University of South China Hengyang421001 China Hunan Engineering Research Center for Monitoring and Treatment of Heavy Metal Pollution in the Upper Reaches of Xiangjiang River Hengyang Normal University Hengyang421001 China Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources Hengyang421001 China

Acid in-situ leach uranium mining significantly alters the geochemistry of the ore zone, and leaves uranium, residual acid, as well as other potential contaminants in groundwater, which bring harm to human health and ecological environment. Many investigators have been trying to propose remediation strategies for the uranium-contaminated groundwater. Phosphate is an effective immobilization reagent of uranium in the groundwater. However, direct injection of phosphate tends to quickly form precipitates, resulting in fast blockage of the seepage passages in the ore zone around the injection holes and hindering its diffusion. In this paper, HAP@SiO2-600, HAP@SiO2-600@25SA, and HAP@SiO2-600@75SA with core-shell structures were prepared. Their slow-release of phosphate, the effects of pH, contact time, initial uranium concentration, and coexisting ions on their removal rate and efficiency of uranium, and their function of remediating uranium-contaminated groundwater were investigated. It was found that the increase of SA content in the outer layer of HAP@SiO2-600@25SA and HAP@SiO2-600@75SA resulted in the slow release rate of phosphate, decreasing the removal rate of uranium. The adsorption capacities of HAP@SiO2-600, HAP@SiO2-600@25SA, and HAP@SiO2-600@75SA from the aqueous solution at pH = 3.0 and 303 K were up to 582.6, 558.5, and 507.3 mg g−1, respectively. In addition, the materials showed excellent uranium removal performance in experiments where multiple ions coexisted. For actual acidic uranium-contaminated groundwater, HAP@SiO2-600, HAP@SiO2-600@25SA, and HAP@SiO2-600@75SA effectively increased the pH from 2.75 to 4.40, 3.87, and 3.72, respectively, and decreased the uranium concentration from 5.12 to 0.0062, 0.0065, and 0.0058 mg L−1, respectively. The FT-IR, XRD, TEM and XPS characterizations were performed to further clarify the uranium removal mechanism, and it was found that the elimination of U(VI) was ascribed to dissolution-precipitation, adsorption and

关键词： Silica

Cysteine and Dialysis Mediated Inhibition of Dynamic Changes in Glycosylated Egg White Protein During Storage

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SSRN 2025年

作者： Guo, Lulu Zhang, Wanqiu Zhang, Fan Hu, Shende Zhao, Qianwen Chang, Cuihua Li, Junhua Zhu, Min Gu, Luping Yang, Yanjun Su, Yujie Huang, Zijian State Key Laboratory of Food Science and Resources School of Food Science and Technology Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province Jiangnan University Jiangsu Wuxi214122 China College of Bioscience and Biotechnology Hunan Agricultural University Hunan Changsha410128 China Hunan Jiapin Jiawei Technology Development Group Co. LTD Hunan Engineering & Technology Research Center for Food Flavors and Flavorings Hunan Jinshi415400 China

Glycosylation is commonly used to improve the solubility and functionality of egg white protein (EWP), but glycosylated EWP is prone to quality deterioration during storage. To enhance its storage stability, cysteine (Cys) addition and dialysis desugar treatment were applied to xylo-oligosaccharide (XOS) glycosylated EWP (GEW) in accelerated storage examinations. Both Cys addition and dialysis minimized changes in soluble protein content, color difference, and particle size during storage. Further, they inhibited the Maillard reaction and the accumulation of its intermediate products. Cys addition effectively maintained protein structures and prevented protein crosslinking. However, dialysis lost the filling and protective effect of free sugars, lowering the denaturation temperature of ovalbumin. Cys and dialysis effectively maintained the stability of emulsifying properties, while cysteine better preserved gelation. Overall, both Cys addition and dialysis effectively enhanced the storage stability of GEW, with Cys proving to be more effective. © 2025, The Authors. All rights reserved.

关键词： Reaction intermediates

Nonstationary Regional Extreme Flood Events Spatio-Temporal Evolution Informed by Climate-Based Clustering Using Hierarchical Bayesian Modeling

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SSRN 2024年

作者： Zeng, Hang Zhou, Yang Liu, Pei Huang, Jiaqi Zhou, Hui Yu, Weihou School of Hydraulic and Environmental Engineering Changsha University of Science & Technology Changsha410114 China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha410114 China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha410114 China Power China Zhongnan Engineering Corporation Limited Changsha410014 China Yueyang Institute of Water Resources and Hydropower Survey Planning and Design Corporation Limited Yueyang414000 China Hydrology and Water Resources Survey Center of Hunan Province Changsha410008 China

There exists increasing evidence that large-scale climate indices are being linked to extreme flood risk in many regions. It is widely recognized that identifying the response of flood to temporal variabilities of climate factors is investigated by nonstationary local hydrological frequency (NLFFA) analysis. However, high uncertainty by using NLFFA usually cannot achieve the accuracy for engineering design, creating need for nonstationary regional flood frequency analysis (NRFFA) for reducing uncertainty. This study presents a NRFFA of flood extremes in Xiangjiang river basin in South-Central, China that is conditioned on the large-scale climate index. The nonstationary regional analysis is developed in a hierarchical Bayesian framework to support partial and full pooling, which can enhance climate-based regionalization skill as well as retain site-specific characteristics. Simultaneously, the modeling structure is designed to consider the spatial dependence across the region and utilized for extreme flood risk estimation. Results from regional models for whole basin and climatically homogeneous sub-region respectively, and local models are compared: the regional models exhibits a great benefit with the estimates uncertainty reduction and allows a better quantification of large-scale climate effect on annual maximum flood peak. Moreover, the regional partial pooling model for homogeneous sub-region with the smallest Deviance Information Criterion value indicate that the regional model can be further improved by considering a prior pooling stations formed by similar significant climate response. © 2024, The Authors. All rights reserved.

关键词： Floods

Regulating iron center by defective MoS2 for superior Fenton-like catalysis in water purification: The key role of surface interaction and superoxide radical in accelerating metal redox-cycling

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Chemosphere 2024年 364卷 143173页

作者： Zhang, Ai-Yong Lin, Zhi-Xian Zhang, Jing-Yu Zhang, Ming-He Zhang, Chi Zhao, Lu Liu, Liang Da, Wei Ye, Lyumeng Anhui Engineering Laboratory for Rural Water Environment and Resources School of Civil Engineering Hefei University of Technology Hefei230009 China Key Laboratory of Water Conservancy and Water Resources in Anhui Province Anhui and Huaihe River Institute of Hydraulic Research Hefei230088 China Hefei Design Institute of China National Tobacco Corporation Hefei230051 China Guangdong Province Engineering Laboratory for Air Pollution Control South China Institute of Environmental Sciences the Ministry of Ecology and Environment of PRC Guangzhou510655 China

Transition metals exhibit high reactivity for Fenton-like catalysis in environmental remediation, but how to save consumption and reduce pollution is of great interest. In this study, rationally designed defect-engineered Fe@MoS2 (Fe@D-MoS2) was prepared by incorporating reactive iron onto structural defects generated from the chemical acid-etching, aiming to improve the energetic consumption of the catalyst in Fenton-like applications. Morphological and structural properties were elucidated in details, the Fenton-like reactivity was evaluated with five phenolic contaminants for oxidant activation, radical generation and environmental remediation. Compared to Fe@MoS2, Fe@D-MoS2 exhibited a 18.9-fold increase in phenol degradation (0.09 versus 1.79 min−1). Quenching experiments, electron paramagnetic resonance tests and electrochemical measurements revealed the dominant sulfate and superoxide radicals. Rendered by strong metal-substrate surface and electronic interactions from regulated chemical environment and coordination structure, the inert ≡ Fe(III) was reduced to the reactive ≡ Fe(II) accompanied by the ≡ Mo(IV) oxidation to ≡ Mo(V) in MoS2 lattice, with adjacent sulfur serving as the key electron transfer bridge. Therefore, this work shows that the incorporation of reactive centers is able to boost two-dimensional sulfide materials for environmental catalysis applications. © 2024 Elsevier Ltd

关键词： Sulfur compounds

An Approach of Pmf Model Coupled with Stable Isotope technology to Track Heavy Metals Accumulated in Farmland Soil

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SSRN 2024年

作者： Zhang, Xufeng Feng, Shaohua Gao, Yun-Ze Liu, Jin-Song Shang, Tingting Zhu, Ningzheng Meng, Xiang-Zhou Modern Agriculture Branch Jiaxing Vocational and Technical College 547 Tongxiang Road Zhejiang Province Jiaxing314036 China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China College of Advanced Materials Engineering Jiaxing Nanhu University 572 Yuexiu Road Zhejiang Province Jiaxing314001 China Jiaxing-Tongji Environmental Research Institute 1994 Linggongtang Road Zhejiang Province Jiaxing314051 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Source apportionment and precise control of heavy metals in farmland soils are helpful to realize the safe use of agricultural soils and ensure the quality and safety of agricultural products. This study analyzed the concentration and distribution of heavy metals in farmland soils from a typical plain river network area, by collecting cultivated layer, subsoil layer and substratum soil samples. Irrigation water, atmospheric deposition and fertilizers were also collected to explore the input of heavy metals from potential sources. The concentrations of Hg exceeded the standard value, with an exceeding rate of 12.5%. Positive matrix factorization (PMF) and stable isotope technology were used to identify the sources of heavy metals in farmland soils, indicating that heavy metals in farmland soils originated from industrial production (32.0%), natural source (28.2%), agricultural activity (25.8%) and vehicle emission (14.0%). Agricultural activity contributed the most to Hg (51.6%), followed by natural source (20.9%), industrial production (15.4%) and vehicle emission (12.1%). Approximately 79.1% of Hg was affected by external inputs, with agricultural activity contributing 65.2%. These results indicated that the combination of PMF and stable isotope technology is a reliable and promising tool for source apportionment of heavy metals in farmland soils. © 2024, The Authors. All rights reserved.

关键词： Heavy metals

Removal of Radioactive Iodine by Cu2o Prepared with Pvp as an Active Agent: Role of Crystal Facets and Oxygen Vacancy in Adsorption Mechanisms

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SSRN 2024年

作者： Dai, Xiao-Jun Chen, Kai-Wei He, Man-Li Chen, Kai Zhou, Xin-Yu Chen, Yi-Ting Gong, Chun-Hui Wang, Peng Mao, Ping Yang, Yi Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China Department of General Education Army Engineering University of PLA Nanjing211101 China Nanjing University of Information Science & Technology Nanjing210044 China National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province School of Chemical Engineering Huaiyin Institute of Technology Huaian223003 China

Radioactive iodine removal continues to pose significant challenges. This study synthesizes six types of Cu2O nanocrystals with varying exposures of crystal facets and edges and an abundance of oxygen vacancies (OVs), leveraging the benefits of facet and defect engineering. Compared to pure {100} and {111} exposed Cu2O, {100}+{111} co-exposed Cu2O exhibited superior adsorption capacity and rate for iodide ions (I-), achieving a removal efficiency of 96% for trace I- (0.1 mg/L). Moreover, OVs significantly contribute to iodide ion (I-) adsorption. Experimental and DFT analyses confirmed that the active sites on {100}/{111} crystal edges possess the highest affinity for I-. The introduction of OVs disrupts the charge balance of the Cu2O surface and reveals unsaturated coordination sites of Cu, significantly increasing the affinity for I-. This research offers insights into the design of effective iodide ion (I-) adsorption materials using crystal facet and defect engineering strategies. © 2024, The Authors. All rights reserved.

关键词： Adsorption

Structure–Performance Correlation Guided Cerium-Based Metal–Organic Frameworks: Superior Adsorbents for Fluoride Removal in Water

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SSRN 2022年

作者： Tang, Xiaofeng Xia, Wu Qu, Xiaolin Liang, Yuntao Zeng, Yuxi Xiong, Weiping Cheng, Min Song, Biao Wang, Chaohai Zhou, Chengyun Zhao, Xiaoying Ministry of Education Changsha410082 China College of Biology Hunan University Changsha410082 China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China

Fluoride in the hydrosphere exceeds the standard, which could be critically hazardous to human health and the natural environment. The adsorption method is a mature and effective way to remove pollutants in water, including fluoride. In this study, we synthesized three kinds of cerium-based metal–organic frameworks (Ce-MOFs) with different structures and properties by modulating the organic ligands (i.e., trimesic acid (BTC), 1,2,4,5-benzenetetracarboxylic acid (PMA), and terephthalic acid (BDC)) via the solvothermal method. The adsorption kinetics of Ce-MOFs on fluoride well fitted the pseudo second order model, and their adsorption isotherms also conform to Langmuir isothermal model. The thermodynamic study reveals that the adsorption process is a spontaneous endothermic reaction. The maximum saturated adsorption capacities of Ce-BTC, Ce-PMA, and Ce-BDC are 70.7, 159.6, and 139.5 mg g−1, respectively. Ce-MOFs have stable and excellent adsorption capacity at pH = 3−9. Coexisting anions (Cl−, SO42−, and NO3−) do not affect the performance of Ce-MOFs for fluoride removal. Moreover, Ce-MOFs also show their broad prospect as superior fluoride adsorbents because of their excellent performance and reusability in real water samples. Organic ligands have a remarkable influence on the defluoridation performance of Ce-MOFs. This work will provide a guiding significance for designing of MOFs as superiors adsorbents for defluoridation. © 2022, The Authors. All rights reserved.

关键词： Adsorption

Interactions of biomass constituents and the effect on the hydrogen storage molecules during fast pyrolysis

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Energy 2025年 328卷

作者： Xie, Wensheng Ullah, Fahim Lu, Yongming Yao, Yuhang Zhang, Ye Shui Zhang, Yutao Ji, Guozhao Li, Aimin Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and Technology Dalian University of Technology Dalian116000 China School of Environment Henan Normal University Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control Ministry of Education Henan Xinxiang453007 China School of Engineering University of Aberdeen AberdeenAB24 3UE United Kingdom Zhejiang Province Key Laboratory of Soil Contamination Bioremediation School of Environment and Resources Zhejiang Agriculture and Forestry University Hangzhou311300 China

Biomass pyrolysis oils are anticipated to serve as a source of bio-based platform chemicals and hydrogen storage molecules, primarily from the decomposition of holocellulose (cellulose and hemicellulose). This study examined the influence of component interactions among the thermal behavior, product distribution, and gas composition of the samples. The results show that in the cellulose and hemicellulose mixtures, the increase in hemicellulose promotes gas and solid production while inhibiting oil yield. However, the increasing hemicellulose reduced the production of aldehydes, acids, and ketones (a result corroborated by infrared characterization), including hydrogen storage molecules, with the most pronounced promotion occurring only in samples with cellulose to hemicellulose equivalence ratio of 2:1. Furthermore, lignin was added to samples with a cellulose-to-hemicellulose ratio of 1:1. The results demonstrated that the increasing lignin also promoted gas and solid production while inhibiting oil yield. Notably, even small amounts of lignin significantly increase the formation of small and hydrogen storage molecules by activating holocellulose through lignin side chain groups. However, a further increase in lignin also reduced the generation of hydrogen storage molecules. This study offers valuable insights for selecting proper raw materials for the generation of platform chemicals and hydrogen storage molecules. © 2025 Elsevier Ltd

关键词： Cracking (chemical)