Removal of heavy metals from soil by vermiculite supported layered double hydroxides with three-dimensional hierarchical structure
Removal of heavy metals from soil by vermiculite supported layered double hydroxides with three-dimensional hierarchical structure
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三维分级结构蛭石负载层状双氢氧化物去除土壤重金属
DOI：
10.1016/j.cej.2020.124554
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发表时间：
2020-06
影响因子：
15.1
通讯作者：
Liu Aiju
中科院分区：
文献类型：
--
作者：
Zhao Shifeng;Meng Zilin;Fan Xin;Jing Ruisen;Yang Junshan;Shao Yifei;Liu Xijuan;Wu Mi;Zhang Qian;Liu Aiju
合成了具有三维分级结构的蠕石负载镁铝层状双氢氧化物(LDH@VMT)，研究了LDH@VMT对土壤中重金属(Cu2+、Pb2+、Zn2+、Ni2+)的去除性能。颗粒内扩散和准二级模型很好地描述了重金属去除的动力学。Cu2+和Pb2+的吸附等温线符合Freundlich模型，而Zn2+和Ni2+的吸附等温线符合Langmuir模型。此外，还研究了沉淀法(Cu2+、Pb2+)和类晶置换法(Zn2+、Ni2+)去除重金属的不同机理。还考察了共存阳离子和柱浸实验对实际性能评估的影响。良好的去除性能为重金属污染土壤提供了一种很有前景的去除策略。
Vermiculite supported Mg-Al layered double hydroxide (LDH@VMT) with three-dimensional hierarchical structure was successfully synthesized and the removal performance of LDH@VMT in soil was investigated for heavy metals removal (Cu2+, Pb2+, Zn2+and Ni2+). Kinetics studies of heavy metals removal were well described by intraparticle diffusion and pseudo-second-order model. Adsorption isotherm data of Cu2+and Pb2+yielded a better accordance of Freundlich model, however, data of Zn2+and Ni2+were fitted Langmuir model well. Moreover, the different mechanisms of heavy metals removal by precipitation (Cu2+, Pb2+) and isomorphous replacement (Zn2+, Ni2+) were investigated and proposed, respectively. The effect of coexistence cations and column leaching experiments for practical performance assessment were also examined. The excellent removal performance suggested a promising strategy in heavy metals contaminated soil.
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DOI：
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