文献类型：期刊文献

英文题名：Stabilization of Ni by rhamnolipid modified nano zero-valent iron in soil: Effect of simulated acid rain and microbial response

作者：Zhao, Xuan[1]; Sang, Li[1,3]; Song, Huihui[1]; Liang, Weiyu[1]; Gong, Kailin[1]; Peng, Cheng[1,2]; Zhang, Wei[1]

机构：[1] State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China; [3] Ningbo Yonghuanyuan Environmental Engineering and Technology Co., Ltd, China

年份：2023

卷号：341

外文期刊名：Chemosphere

收录：EI(收录号：20233614689307)

语种：英文

外文关键词：Bacteria - Iron - Lipids - Organic carbon - Soil conservation - Soils - Stabilization - Surface active agents - Toxicity

摘要：Nickel (Ni), as one of the essential micronutrients, exists widely in nature, but high concentration of Ni in soil can pose certain biological toxicity. Nano zero-valent iron (nZVI) and rhamnolipid modified nZVI (RL@nZVI) can effectively stabilize Ni in soil. In this study, the stabilization effect of nZVI and RL@nZVI on the Ni-polluted soil under simulated acid rain and the microbial community response during the soil remediation under different Ni levels (200, 600, and 1800 mg/kg) were investigated. The results show that the addition of nZVI and RL@nZVI increased the pH of leachate to neutral and decreased the amount of Ni in leachate (23.33%–47.06% by nZVI and 50.01%–70.47% by RL@nZVI), indicating that nZVI and RL@nZVI could reduce the potential radial migration risk of Ni in soil under simulated acid rain. The addition of RL@nZVI was beneficial to recover the soil bacterial community diversity, which was inhibited by Ni pollution, and rhamnolipid coating could reduce the toxicity of nZVI. The dominant bacteria in RL@nZVI-treated soil with low, medium, and high Ni pollution were Firmicutes, Proteobacteria and Actinobacteria, respectively. Soil potential, total organic carbon, and pH were the main driving factors affecting the bacterial community structure, while Ni stress only caused changes in the relative abundance of some tolerant bacteria. ? 2023 Elsevier Ltd