Surface functionalization of MXene with chitosan through in-situ formation of polyimidazoles and its adsorption properties
Surface functionalization of MXene with chitosan through in-situ formation of polyimidazoles and its adsorption properties
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壳聚糖原位形成聚咪唑对 MXene 进行表面功能化及其吸附性能
DOI：
10.1016/j.jhazmat.2021.126220
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发表时间：
2021
影响因子：
13.6
通讯作者：
Wei Yen
中科院分区：
文献类型：
--
作者：
Yang Guang;Hu Xin;Liang Jie;Huang Qiang;Dou Jibo;Tian Jianwen;Deng Fengjie;Liu Meiying;Zhang Xiaoyong;Wei Yen
本文采用简单的方法制备了一种新型的咪唑-MXene杂化复合材料，即聚咪唑链覆盖在MXene表面（Ti3C2@IMIZ）。通过这种策略，咪唑可以通过使用壳聚糖作为可再生反应物的简单多组分反应在MXene表面原位生长。基于表征结果，我们证明了具有有序链状结构的咪唑类化合物薄层嵌入到Ti 3C 2表面，从而形成了一种新型的咪唑类化合物-MXene杂化复合材料。以Cr（Ⅵ）为吸附质，研究了Ti3C2@IMIZ对环境污染物的吸附性能。研究了Ti3C2@IMIZ对Ti3C2@IMIZ的吸附特性，包括操作因素、吸附动力学和吸附等温线模型。XPS分析表明，Cr（VI）在吸附过程中转化为毒性较低的Cr（III）。Cr（VI）的吸附和Cr（VI）还原为Cr（III）有助于消除Cr（VI）物种。吸附行为和过程分析表明，吸附机理主要是通过静电作用进行的物理吸附。良好的重现性表明Ti3C2@IMIZ可能是实际污水处理中去除Cr（VI）的潜在候选材料。
In this work, a novel imidazoles-MXene hybrid composite, namely polyimidazoles chain overlaying on the surface of MXene (Ti3C2@IMIZ), was prepared by a simple method. Through this strategy, imidazoles can be in situ growth on the surface of MXenes via a facile multicomponent reaction using chitosan as a renewable reactant. Based on the characterization results, we demonstrated that a thin layer imidazoles with an ordered chain structure was embedded on the surface of Ti3C2, which resulted in the formation of a novel imidazoles-MXene hybrid composite. The adsorption performance of Ti3C2@IMIZ for removal environmental pollutants was evaluated using heavy metal ions of Cr(Ⅵ) as adsorbate. Detailed adsorption characteristics of Ti3C2@IMIZ including operational factors, adsorption kinetics and isotherms models were investigated. XPS analysis showed that Cr(VI) was converted to Cr(III) with low toxicity during the adsorption process. The adsorption of Cr(VI) and reduction of Cr(VI) to Cr(III) contribute to elimination of Cr(VI) species. The adsorption behavior and process analysis show that the adsorption mechanism is mainly physical adsorption through electrostatic interaction. The excellent reproducibility suggests that Ti3C2@IMIZ may be a potential candidate for remove of Cr(Ⅵ) in actual sewage treatment.