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
作者： Yu, Peng 1 ; Li, Shun 1 ; Zhang, Chun 1 ; Huang, Wei 1 ; Qin, Yilin 1 ; Liao, Yulin 2 ; Li, Jianglin 3 ; Wang, Zhiguo 1 ;
作者机构： 1.Hunan Agr Univ, Sch Chem & Mat Sci, Changsha, Peoples R China
2.Soil & Fertilizer Inst Hunan Prov, Hunan Acad Agr Sci, Changsha, Peoples R China
3.Agr & Rural Affairs Bur Liling City, Cropland Qual & Soil Fertilizer Workstat, Liling, Peoples R China
4.Hunan Agr Univ, Sch Chem & Mat Sci, Changsha 410128, Peoples R China
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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