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| 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 |
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Abstract 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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Received: 30 September 2015
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