Stabilization of V contaminated soils with adsorption materials
ZHANG Wen-jie1, JIANG Jian-guo1,2,3, LI De-an1, LI Tian-ran1, LI Kai-min1, WANG Jia-ming1
1. School of Environment, Tsinghua University, Beijing 100084, China;
2. Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education, Tsinghua University, Beijing 100084, China;
3. Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University, Beijing 100084, China
Chitosan and activated carbon, with different quality ratio, was added into the tested soil, then toxicity leaching experiments were conducted to study the stabilizing effect of adsorption materials on V and Cr from the tested soil. Besides, FTIR (Fourier Transform infrared spectroscopy) and XPS (X-ray photoelectron spectroscopy) were performed to explore the stabilization mechanism of the adsorption materials. Chitosan could significantly reduce the leaching concentration of V and Cr from the contaminated soil. The stabilizing effect of activated carbon on Cr was better than that on V from the tested soil, while the stabilizing effect was not affected significantly by the dosage of adsorption materials. The stabilization rate of V and Cr from the tested soil was 74.04% and 46.77%, respectively, by chitosan with the dosage of 0.5% after 30d stabilization; while 1.86% of V and 87.75% of Cr could be stabilized, respectively, when 0.5% of active carbon was used. FTIR and XPS results on the adsorption materials showed that there were numerous of amino and hydroxyl groups in the chitosan, while amino and oxygen-containing groups were limited in activated carbon. Thus, chitosan and activated carbon were promising stabilizers available to remediate the contaminated soil.
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ZHANG Wen-jie, JIANG Jian-guo, LI De-an, LI Tian-ran, LI Kai-min, WANG Jia-ming. Stabilization of V contaminated soils with adsorption materials. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(5): 1500-1505.
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