Modified natural diatomite and its enhanced immobilization of lead, copper and cadmium in simulated contaminated soils

Journal of Hazardous Materials
Xinxin YeHuijun Zhao

Abstract

Natural diatomite was modified through facile acid treatment and ultrasonication, which increased its electronegativity, and the pore volume and surface area achieved to 0.211 cm(3) g(-1) and 76.9 m(2) g(-1), respectively. Modified diatomite was investigated to immobilize the potential toxic elements (PTEs) of Pb, Cu and Cd in simulated contaminated soil comparing to natural diatomite. When incubated with contaminated soils at rates of 2.5% and 5.0% by weight for 90 days, modified diatomite was more effective in immobilizing Pb, Cu and Cd than natural diatomite. After treated with 5.0% modified diatomite for 90 days, the contaminated soils showed 69.7%, 49.7% and 23.7% reductions in Pb, Cu and Cd concentrations after 0.01 M CaCl2 extraction, respectively. The concentrations of Pb, Cu and Cd were reduced by 66.7%, 47.2% and 33.1% in the leaching procedure, respectively. The surface complexation played an important role in the immobilization of PTEs in soils. The decreased extractable metal content of soil was accompanied by improved microbial activity which significantly increased (P<0.05) in 5.0% modified diatomite-amended soils. These results suggested that modified diatomite with micro/nanostructured characteristics increased...Continue Reading

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Citations

Nov 8, 2015·Journal of Hazardous Materials·Hongying LiGuozhong Wang
Aug 26, 2017·International Journal of Environmental Research and Public Health·Maja RadziemskaAnna Baryła
Jan 4, 2018·International Journal of Environmental Research and Public Health·Maja RadziemskaMgdalena D Vaverková
Jan 14, 2020·Environmental Science and Pollution Research International·Jingjie ChangQiang Xue
Aug 23, 2020·International Journal of Environmental Research and Public Health·Maja RadziemskaZbigniew Mazur
Nov 19, 2020·Royal Society Open Science·Zheng WangQin Deng
Feb 20, 2021·Journal of Environmental Management·Shiv PrasadJaved Alam
Dec 12, 2018·Ecotoxicology and Environmental Safety·Xinxin YeHongjian Gao

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