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

    Author
    Ye, Xinxin
    Kang, Shenghong
    Wang, Huimin
    Li, Hongying
    Zhang, Yunxia
    Wang, Guozhong
    Zhao, Huijun
    Year published
    2015
    Metadata
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    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 cm3 g−1 and 76.9 m2 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 the immobilization of PTEs in contaminated soil and had great potential as green and low-cost amendments.
    Journal Title
    Journal of Hazardous Materials
    Volume
    289
    DOI
    https://doi.org/10.1016/j.jhazmat.2015.02.052
    Subject
    Engineering not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/100982
    Collection
    • Journal articles

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