材料科学
纳米片
水滑石
吸附
锑
水溶液
化学工程
扩散
水溶液中的金属离子
金属
作者
Xinyue Zhang,NIanyi Xie,Ying Guo,Rongxiu Guo,Tong Jiang,Yao Wang,Yiming Wang,Dun Niu,Yang Qi,Hong-bin Sun
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2022-04-02
卷期号:33 (27): 275704-275704
被引量:1
标识
DOI:10.1088/1361-6528/ac639a
摘要
Abstract Actuated by the non-ionic heavy metal of antimony (Sb) contaminants with undesired toxicity to the environment and human health, capturing Sb is urgent to remedy contaminated water. Herein, the lamellar MnCo hydrotalcite was grown on catkin-derived biochar through the in situ etching of ZIF-L to construct a hierarchical microtube@nanosheet hybrid (CLMH) for Sb immobilization. The adsorption behaviour and mechanism of trivalent antimony (Sb (III)) on the CLMH were investigated. The CLMH shows good pH applicability for capturing Sb(III) at pH from 2 to 9. The excellent adsorption capacity of CLMH for Sb(III) is 247.62 mg g −1 at 303 K, and the endothermic process is proved by the positive value of Δ H 0 (10.54 kJ mol −1 ). The adsorption process is fitted with the intra-particle diffusion model, which can be described with external mass transfer, intraparticle diffusion in pores, and equilibrium stage. The adsorption mechanism is proved, which includes the bind of Metal–O–Sb bonds by inner-sphere complex, the embedding of Sb in the intercalation of hydrotalcite, redox between Mn and Sb, and functional groups dependent anchoring effect. The work benefits the understanding of the antimony removal behaviour over the hierarchical microtube@nanosheet hybrids.
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