Insight into the Mechanism of Cd2+ Removal by MgAl Layered Double Hydroxides with Different Host-Guest Interactions

被引：12
作者：
Li, Qian [1 ]
Wu, Zhaohui [1 ]
Bai, Sha [1 ]
Liu, Yingjie [1 ]
Li, Jiaxin [1 ]
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 Provin, Peoples R China
来源：
CHEMISTRY-A EUROPEAN JOURNAL | 2023年 / 29卷 / 37期
关键词：
adsorption; cadmium; host-guest interactions; layered double hydroxides; isomorphic substitution; HEAVY-METAL IONS; EFFICIENT REMOVAL; ABSORPTION; ADSORPTION; SPECTROSCOPY; CHLORIDE; SORPTION; ANIONS; SOIL;
D O I：
10.1002/chem.202300050
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Layered double hydroxides (LDHs) have shown great potential as adsorbents for the removal of heavy metals. Nevertheless, how the host-guest interactions of LDHs affect the removal mechanism remains to be less explored. Herein, CO32-/NO3-/SO42-/Cl- intercalated MgAl-LDHs with different host-guest interactions were fabricated and their removal mechanism for Cd2+ was investigated. The removal capacity increased in the order of MgAl-CO3 (127.3 mg/g)<MgAl-SO4 (173.3 mg/g)<MgAl-NO3 (305.0 mg/g)approximate to MgAl-Cl (312.5 mg/g). The quasi-in-situ XRD and XAS demonstrated that Cd2+ was removed as CdCO3 for MgAl-CO3, while for MgAl-Cl/NO3/SO4, Cd2+ was removed as CdAl-LDHs by an isomorphic substitution mechanism. DFT calculations revealed that compared to the CdAl-LDHs formation the Gibbs free energy of the CdCO3 formation was lower, which made it easier to remove Cd2+ as CdCO3 on MgAl-CO3. Conversely, isomorphic substitution of MgAl-NO3 to obtain CdAl-LDHs was a free energy reduction process.
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页数：9
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