Revisiting the super-stable mineralization mechanism of CaAl-LDHs for Cu2+ and complete removal of Cu2+ by structured CaAl-LDHs

被引：4
|
作者：
Lin, Tong [1 ]
Deng, Zhuoqun [1 ]
Shen, Tianyang [1 ]
Wang, Haoran [1 ]
Sun, Xinyuan [1 ]
Zheng, Ruoxuan [1 ]
Chen, Wei [1 ,2 ]
An, Sai [1 ,2 ]
Song, Yu-Fei [1 ,2 ]
机构：
[1] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
[2] Quzhou Inst Innovat Resource Chem Engn, Quzhou 324000, Zhejiang, Peoples R China
来源：
CHEMICAL ENGINEERING SCIENCE | 2024年 / 288卷
基金：
中国国家自然科学基金;
关键词：
Layered double hydroxides; Super -stable mineralization; Heavy metal ions; Complete removal; Isomorphic substitution; Dissolution; -recombination; HEAVY-METALS; EFFICIENT REMOVAL; SOIL; REMEDIATION; ADSORPTION; EDTA;
D O I：
10.1016/j.ces.2024.119822
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The in-situ mineralization is regarded as one of the most promising remediation technologies for heavy metals removal. Herein, the CaAl-LDHs (LDHs = layered double hydroxides) with the particle size of similar to 3 mu m were successfully synthesized, which exhibited the saturated mineralization capacity of 588.23 mg/g and a removal efficiency of >99 % for Cu2+ ions in aqueous solution. The mineralization equilibrium can be reached in 150 min. Detailed quasi-situ XRD and HRTEM results revealed that besides the isomorphic substitution mechanism, the dissolution-recombination mechanism can be observed, as evidenced by the co-existence of CaAl-LDHs and CuAl-LDHs in only 5 min. Meanwhile, the CaAl-LDHs can be packaged into the polyacrylonitrile (PAN) membranes and the resultant CaAl-LDHs/PAN showed removal efficiency of 95 % towards Cu2+ in 7 days of column leaching experiment. Such filter bags can be easily taken away, resulting in the complete removal of Cu2+ from soil.
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页数：8
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