Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 13, Pages 15579-15587Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c00861
Keywords
MXene; amidoxime group; diazonium salt; uranium capture; electrosorption
Funding
- Natural Science Foundation of China [11675192, 21836001, 21777161, 11975016, 21577144]
- National Science Fund for Distinguished Young Scholars [21925603]
- Science Challenge Project [TZ2016004]
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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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