Details

Autor(en) / Beteiligte

• Ye, Xinxin
• Kang, Shenghong
• Wang, Huimin
• Li, Hongying
• Zhang, Yunxia
• Wang, Guozhong
• Zhao, Huijun

Titel

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

Ist Teil von

• Journal of hazardous materials, 2015-05, Vol.289, p.210-218

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2015

Quelle

MEDLINE

Beschreibungen/Notizen

• •We modify natural diatomite using the facile acid treatment and ultrasonication.•Modification add pore volume, surface area and electronegativity of natural diatomite.•Modified diatomite is superior to natural diatomite in soil heavy metal remediation.•Modified diatomite can be promising for in-situ immobilization of heavy metal in soil. Natural diatomite was modified through facile acid treatment and ultrasonication, which increased its electronegativity, and the pore volume and surface area achieved to 0.211cm3g−1 and 76.9m2g−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 0.01M 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.