Roles of nanoparticles in arsenic mobility and microbial community composition in arsenic-enriched soils  

作　　者：Ting Luo Qining Zheng Jie Yu Weihao Liang Yan Sun Guixiang Quan Feng Zhou 

机构地区：[1]School of Environmental Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China [2]Jiangsu Provincial Key Laboratory of Coastal Ecology and Pollution Control,Yancheng 224051,China [3]School ofEnvironment and Civil Engineering,Jiangnan University,Wuxi 214122,China

出　　处：《Journal of Environmental Sciences》2024年第4期301-311,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.41977283);the Qing Lan Project of Jiangsu Province of China。

摘　　要：Environmental effects of nano remediation engineering of arsenic(As)pollution need to be considered.In this study,the roles of Fe_(2)O_(3)and TiO_(2)nanoparticles(NPs)on the microbial mediated As mobilization from As contaminated soil were investigated.The addition of Fe_(2)O_(3)and TiO_(2)NPs restrained As(V)release,and stimulated As(Ⅲ)release.As(V)concentration decreased by 94% and 93% after Fe_(2)O_(3)addition,and decreased by 89% and 45% after Ti O_(2)addition compared to the Biotic and Biotic+Acetate(amended with sodium acetate)controls,respectively.The maximum values of As(Ⅲ)were 20.5 and 27.1μg/L at 48 d after Fe_(2)O_(3)and TiO_(2)NPs addition,respectively,and were higher than that in Biotic+Acetate control(12.9μg/L).The released As co-precipitated with Fe in soils in the presence of Fe_(2)O_(3)NPs,but adsorbed on TiO_(2)NPs in the presence of TiO_(2)NPs.Moreover,the addition of NPs amended with sodium acetate as the electron donor clearly promoted As(V)reduction induced by microbes.The NPs addition changed the relative abundance of soil bacterial community,while Proteobacteria(42.8%-70.4%),Planctomycetes(2.6%-14.3%),and Firmicutes(3.5%-25.4%)were the dominant microorganisms in soils.Several potential As/Fe reducing bacteria were related to Pseudomonas,Geobacter,Desulfuromonas,and Thiobacillus.The addition of Fe_(2)O_(3)and TiO_(2)NPs induced to the decrease of arr A gene.The results indicated that the addition of NPs had a negative impact on soil microbial population in a long term.The findings offer a relatively comprehensive assessment of Fe_(2)O_(3)and TiO_(2)NPs effects on As mobilization and soil bacterial communities.

关 键 词：Fe_(2)O_(3)and TiO_(2)nanoparticles Arsenic reduction MOBILIZATION Functional gene Microbial community 

分 类 号：X53[环境科学与工程—环境工程]