Remediation of Pb-contaminated soil by magnetic micro-nano size composite MFH

文献类型： 外文期刊

第一作者： Li, Jie

作者： Li, Jie;Wang, Qiang;Luo, Meng;Sun, YuanPeng;Zhang, Lizhi;Li, Jie;Wang, Qiang;Sun, YuanPeng;Zhang, Lizhi;Luo, Meng

作者机构：

关键词： Magnetic composite materials; Soil remediation; Pb; Influential factors; Hydroxyapatite

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：2.8； 五年影响因子：3.3 ）

ISSN： 1439-0108

年卷期：

页码：

收录情况： SCI

摘要： Purpose In China, soil heavy metal pollution has become a major environmental problem, posing a serious threat to sustainable development. To remediate Pb-contaminated soil more efficiently, quickly, and inexpensively, a micro-nano-sized (2 mu m) magnetic composite (MFH) was prepared. Materials and methods The synthesized materials were characterized by using various techniques such as SEM, TEM, XRD, and VSM. In order to study the reaction mechanism of MFH with Pb(II) in soil, the adsorption of Pb(II) by MFH was investigated. Results and discussion The results showed that MFH had good treatment effects on soils with different levels of lead contamination. The smaller water-soil ratio makes MFH more efficient in treating Pb-contaminated soil. MFH has the best remediation effect on neutral soil with pH = 7, followed by acidic lead-contaminated soil. With the prolongation of treatment time, the removal rate of total lead increased rapidly and reached a relatively stable level in about 8 h, with a total lead removal of 101.05 mu g g(-1). In addition, the high temperature favored the removal of Pb. However, the increase of ionic strength inhibited the removal of total Pb from the soil by MFH. Conclusion The Pb(II) adsorbed by MFH material can be recovered by magnetic separation, and the recovery rate can reach more than 88% with good recovery and regeneration ability. In short, MFH is an efficient soil in situ remediation material.

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