文献类型：期刊文献

英文题名：Immobilization of Ni (Ⅱ) at three levels of contaminated soil by rhamnolipids modified nano zero valent iron (RL@nZVI): Effects and mechanisms

作者：Sang, Li[1]; Wang, Gehui[1]; Liu, Lin[1]; Bian, Hao[1]; Jiang, Lingling[1]; Wang, Huadong[1]; Zhang, Yinjie[1]; Zhang, Wei[1,2]; Peng, Cheng[1]; Wang, Xuedong[3]

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] State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, Shanghai, 200237, China

年份：2021

卷号：276

外文期刊名：Chemosphere

收录：EI(收录号：20211010038692)

语种：英文

外文关键词：Iron oxides - Surface active agents - Hydrogen bonds - Synthesis (chemical) - Remediation - Soil pollution - Soils - Carboxylation - Binary alloys

摘要：A kind of biosurfactant rhamnolipid modified zero-valent iron nanoparticles have been synthesized and applied to evaluate the immobilization efficiency of Ni (Ⅱ) contaminated soil at three concentration levels (200Ni, 600Ni and 1800Ni). The results of SEM and XRD were clearly indicative of the well-attached phenomenon of rhamnolipid on the nZVI, featuring better stability and dispersity, and FTIR analysis proposed the interactions between rhamnolipid and nZVI through monodentate chelating between carboxylate groups and nZVI or hydrogen bonding with Fe-O groups on the surface. Sequential extraction procedures (SEP) analysis illustrated that the majority of labile fractions had been transformed into less accessible fractions (Fe-Mn oxide-bound fractions and residual fractions) after 28 days of incubation. And for low-concentrations polluted soil, soil self-remediation played a dominant role, while RL@nZVI exhibited a more significant stabilizing effect for medium and high-concentrations pollution. Furthermore, XPS and XRD analyses of Ni-adsorbed RL@nZVI identified the formation of NiO, Ni(OH)2 and revealed the possible interaction mechanisms including reduction, adsorption and precipitation/co-precipitation. These results confirmed that RL@nZVI presented a promising prospect for the immobilization of Ni polluted soil. ? 2021 Elsevier Ltd