Adsorption Mechanism of Bentonite with Dispersed Chitosan for Cadmium Ions,Chemical Engineering & Technology

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Adsorption Mechanism of Bentonite with Dispersed Chitosan for Cadmium Ions
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2020-12-29 , DOI: 10.1002/ceat.202000505
Chengdu Huang ₁ , Yongchun Huang ₁ , Tenghui Xie ₁ , Wanguo Yu ₁ , Shuo Ai ₁

Affiliation

Chitosan was dispersed on bentonite for the preparation of a Cd²⁺ adsorbent. The adsorption process followed a Freundlich isotherm, and the experimental adsorption capacity was determined. For understanding the adsorption mechanism, the pristine and Cd‐doped adsorbents were analyzed by Fourier transform infrared and X‐ray photoelectron spectroscopy. A red shift of the band corresponding to amino groups was observed, while the Cd 3d binding energy declined. Furthermore, density functional theory calculation results indicated that Cd²⁺ bonded with amino and hydroxyl groups in chitosan. The zeta potential of the adsorbent was lower than that of the support bentonite, improving the electrostatic affinity for Cd²⁺. The synergy between electrostatic and coordination interactions contributed to the adsorption capacity.

中文翻译：

膨润土与分散的壳聚糖对镉离子的吸附机理

将壳聚糖分散在膨润土上以制备Cd ²⁺吸附剂。吸附过程遵循Freundlich等温线，并确定了实验吸附容量。为了了解吸附机理，通过傅里叶变换红外和X射线光电子能谱分析了原始和Cd掺杂的吸附剂。观察到对应于氨基的条带的红移，而Cd 3d的结合能下降。此外，密度泛函理论计算结果表明，Cd ²⁺与壳聚糖中的氨基和羟基键合。吸附剂的ζ电势低于载体膨润土的ζ电势，提高了对Cd ²⁺的静电亲和力。静电和配位相互作用之间的协同作用有助于吸附能力。

更新日期：2021-02-19

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