MXenes公司
铀酰
材料科学
吸附
吸附
水溶液
电化学
地下水修复
吸附剂
水溶液中的金属离子
化学工程
铀
无机化学
环境修复
金属
纳米技术
电极
有机化学
化学
冶金
物理化学
工程类
污染
生物
生态学
作者
Pengcheng Zhang,Lin Wang,Zhiwei Huang,Jipan Yu,Zijie Li,Hao Deng,Ting Yin,Liyong Yuan,John K. Gibson,Lei Mei,Lirong Zheng,Hongqing Wang,Zhifang Chai,Wei‐Qun Shi
标识
DOI:10.1021/acsami.0c00861
摘要
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 Ti3C2Tx MXene surface by diazonium salt grafting. The introduction of amidoxime functional groups significantly enhances the selectivity of Ti3C2Tx nanosheets 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 Ti3C2Tx nanosheets 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.
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