Aryl Diazonium-Assisted Amidoximation of MXene for Boosting Water Stability and Uranyl Sequestration via Electrochemical Sorption
Aryl Diazonium-Assisted Amidoximation of MXene for Boosting Water Stability and Uranyl Sequestration via Electrochemical Sorption
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芳基重氮辅助 MXene 的偕胺肟化通过电化学吸附提高水稳定性和铀酰封存
DOI：
10.1021/acsami.0c00861
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发表时间：
2020
影响因子：
9.5
通讯作者：
Shi Weiqun
中科院分区：
文献类型：
--
作者：
Zhang Pengcheng;Wang Lin;Huang Zhiwei;Yu Jipan;Li Zijie;Deng Hao;Yin Taiqi;Yuan Liyong;Gibson John K.;Mei Lei;Zheng Lirong;Wang Hongqing;Chai Zhifang;Shi Weiqun
尽管二维过渡金属碳化物和碳氮化物（MXenes）是修复环境污染物的新兴候选材料，但构建对目标重金属离子和放射性核素具有高亲和力的强大功能化MXene纳米片仍然是一个挑战。本文报道了用重氮盐接枝在Ti3C2TxMXene表面成功放置偕胺肟螯合基团。偕胺肟官能团的引入显著提高了Ti3C2Txnanosheets对铀酰离子的选择性，并大大提高了其在水溶液中的稳定性，实现了从含有竞争金属离子的水溶液中高效、快速、可回收地提取铀。得益于MXenes优异的导电性，偕胺肟功能化ti3c2tx纳米片表现出优异的电化学性能，当负载在碳布上时，施加电场将铀的吸附量从294 mg/g增加到626 mg/g，优于之前报道的所有有机电化学吸附材料。本研究提供了一种有效的MXene纳米片功能化策略，对MXene基选择性电吸附电极材料的设计具有重要意义。
Despite that two-dimensional transition metal carbides and carbonitrides (MXenes) are burgeoning candidates for remediation of environmental pollutants, the construction of robust functionalized MXene nanosheets with a high affinity for target heavy metal ions and radionuclides remains a challenge. Here we report the successful placement of amidoxime chelating groups on Ti3C2TxMXene surface by diazonium salt grafting. The introduction of amidoxime functional groups significantly enhances the selectivity of Ti3C2Txnanosheets for uranyl ions and also greatly improves their stability in aqueous solution, enabling efficient, rapid, and recyclable uranium extraction from aqueous solutions containing competitive metal ions. Benefiting from the excellent conductivity of MXenes, the amidoxime functionalized Ti3C2Txnanosheets show outstanding electrochemical performance such that when loaded on carbon cloth the application of an electric field increases the uranium adsorption capacity from 294 to 626 mg/g, outperforming all organic electrochemical sorption materials reported previously. The present work provides an effective strategy to functionalize MXene nanosheets with fundamental implications for the design of MXene-based selective electrosorption electrode materials.