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Arsenic and cadmium removal from water by a calcium-modified and starch-stabilized ferromanganese binary oxide

Journal of Environmental Sciences 2020年第10期32卷 186-193页

作者： Huxing Chen Fangnan Xu Zhengzheng Chen ouyuan jiang Williamson Gustave Xianjin Tang School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Institute of Soil and Water Resources and Enuironmental Science Zhejiang Prouincial Key Laboratory of Agricultural Resources and EnuironmentZhejiang UniuersityHangzhou 310058China School of Chemistry Enuironmental&Life SciencesUniuersity of The BahamasNew ProuidenceNassauThe Bahamas

A new calcium-modified and starch-stabilized ferromanganese binary oxide (Ca-SFMBO)sorbent was fabricated with different Ca concentrations for the adsorption of arsenic (As)and cadmium (Cd) in *** maximum As(Ⅲ) and Cd(Ⅱ) adsorption capacities of 1%CaSFMBO were 156.25 mg/g and 107.53 mg/g respectively in single-adsorption *** adsorption of As and Cd by the Ca-SFMBO sorbent was pH-dependent at values from 1 to 7,with an optimal adsorption pH of *** the dual-adsorbate system,the presence of Cd(Ⅱ) at low concentrations enhanced As(Ⅲ) adsorption by 33.3%,while the adsorption of As(Ⅲ) was inhibited with the increase of Cd(Ⅱ) ***,the addition of As(Ⅲ) increased the adsorption capacity for Cd(Ⅱ) up to *** analysis by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR),it was inferred that the mechanism for the co-adsorption of Cd(Ⅱ) and As(Ⅲ) included both competitive and synergistic effects,which resulted from the formation of ternary *** results indicate that the Ca-SFMBO material developed here could be used for the simultaneous removal of As(Ⅲ) and Cd(Ⅱ) from contaminated water.

关键词： Arsenic Cadmium Calcium Fe–Mn binary oxide Complexation Adsorption

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Root exudates increased arsenic mobility and altered microbial community in paddy soils

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Journal of Environmental Sciences 2023年第5期127卷 410-420页

作者： ouyuan jiang Lvyao Li Guilan Duan Williamson Gustave Weiwei Zhai Lina Zou Xia An Xianjin Tang Jianming Xu Institute of Soil and Water Resources and Environmental Science Zhejiang Provincial Key Laboratory of Agricultural Resources and EnvironmentZhejiang UniversityHangzhou 310058China Zhejiang Xiaoshan Institute of Cotton&Bast Fiber Crops Research Flower Research and Development CentreZhejiang Academy of Agricultural SciencesHangzhou 311202China University of Chinese Academy of Sciences Beijing 100049China School of Chemistry Environmental&Life SciencesUniversity of The BahamasNew ProvidenceNassauBahamas

Root exudates are crucial for plants returning organic matter to soils,which is assumed to be a major source of carbon for the soil microbial *** study investigated the influence of root exudates on the fate of arsenic(As)with a lab simulation *** findings suggested that root exudates had a dose effect on the soil physicochemical properties,As speciation transformation and the microbial community structure at different *** addition of root exudates increased the soil pH while decreased the soil redox potential(Eh).These changes in the soil pH and Eh increased As and ferrous(Fe(Ⅱ))concentrations in soil *** showed that 40 mg/L exudates addition significantly increased arsenite(As(Ⅲ))and arsenate(As(Ⅴ))by 541 and 10 times respectively within 30 days in soil *** relative abundance of Fe(Ⅲ)-reducing bacteria Geobacter and Anaeromyxobacter increased with the addition of root exudates,which enhanced microbial Fe *** these results suggest that investigating how root exudates affect the mobility and transformation of As in paddy soils is helpful to systematically understand the biogeochemical cycle of As in soil-rice system,which is of great significance for reducing the health risk of soil As contamination.

关键词： Arsenic Root exudates Paddy soils Speciation Microbial community

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