Layered Double Hydroxides Reduce the Availability of Cadmium and Lead in Soil and the Content of Cadmium and Lead in Grain

文献类型： 外文期刊

第一作者： Yu, Peng

作者： Yu, Peng;Li, Shun;Zhang, Chun;Huang, Wei;Qin, Yilin;Wang, Zhiguo;Liao, Yulin;Li, Jianglin;Wang, Zhiguo

作者机构：

关键词： Layered double hydroxides; synergistic remediation; cadmium(cd) and lead(pb); soil remediation; practical application

期刊名称：SOIL & SEDIMENT CONTAMINATION （ 影响因子：2.0； 五年影响因子：2.3 ）

ISSN： 1532-0383

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Layered double hydroxides (LDHs) have excellent immobilization effects on heavy metals (HMs) in water and soil. For the first time in Hunan province, the immobilization effect of Ca-Al LDH (SR-02-02) and Mg-Al LDH (SR-02-03) for the remediation of Cd and Pb was examined in contaminated soils. With treatments of SR-02-02 at 3000 kg/ha(L2-3), the immobilization effect of available Cd and Pb was 54.74% and 20.85%; with treatments of SR-02-03 at 3000 kg/ha(L3-3), the immobilization effect of available Cd and Pb was 68.02% and 26.70%, which showed that Cd, and Pb were gradually solidified into stable oxidizable and residual state. Less HMs were absorbed by rice as a result of the immobilization effect of SR-02-02 and SR-02-03, and the concentration of Cd and Pb in the root, stem, husk, and grain of rice were also significantly reduced. In particular, under the treatment of L2-3, the content of Cd and Pb in grain decreased by 69.13% and 72.67%, respectively; under the treatment of L3-3, the content of Cd and Pb in grain decreased by 80.76% and 100%, respectively. This was because LDHs materials reacted with HMs to form Cd-OH, Pb-OH, CdAl-LDH, and Ca/Mg-O-Pb etc. which reduced the availability of HMs. In conclusion, LDHs material is a promising material for the synergistic remediation of Cd and Pb contaminated soil.

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