Screening hydroxyapatite for cadmium and lead immobilization in aqueous solution and contaminated soil: The role of surface area

文献类型： 外文期刊

第一作者： Li, Hongying

作者： Li, Hongying;Guo, Xisheng;Ye, Xinxin;Ye, Xinxin

作者机构：

关键词： Hydroxyapatite;Cadmium;Lead;Remediation;Structure and morphology

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

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年卷期：

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收录情况： SCI

摘要： Hydroxyapatite (HAP) has been widely used to immobilize many cationic metals in water and soils. The specific reason why an increase in the surface area of HAP enhances cadmium (Cd) uptake, but has no effect on lead (Pb) uptake, is not clear. The aim of this study was to determine the factors causing the differences in sorption behavior between Cd and Pb by evaluating HAPs with different surface areas. We synthesized HAPs with two different surface areas, which were characterized by X-ray diffraction, N-2 adsorption, and scanning electron microscopy, and then evaluated them as sorbents for Cd and Pb removal by testing in single and binary systems. The sorption capacity of large surface area HAP (1.85 mmol/g) for Cd in the single-metal system was higher than that of small surface area HAP (0.64 mmol/g), but there were no differences between single-and binary-metal solutions containing Pb. After the Cd experiments, the HAP retained a stable structure and intact morphology, which promotes the accessibility of reactive sites for Cd. However, a newly formed precipitate covered the surface and blocked the channels in the presence of Pb, which reduced the number of potential adsorption sites on HAP for Cd and Pb. Remediation experiments using Cd-and Pb-contaminated soil produced similar results to the solution tests. These results indicate that alterations of the structure and morphology during the reaction is an important factor influencing metal sorption to HAP. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

分类号： X5

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