Authors
Qianxi Li, Jianguo Zhou, Yingsheng Xu, Zhen Jin, Hongjian Zhou
Published in
Journal of colloid and interface science. Volume 724. Issue Pt 1. Pages 141041. Jun 27, 2026. Epub Jun 27, 2026.
Abstract
The selective extraction of uranium from seawater is crucial for sustainable resource recovery and environmental protection, yet remains challenging due to severe interference from coexisting ions. Herein, we reported a step scheme (S-scheme) heterojunction, denoted as TD-COF@IS, based on a spherical Schiff-based covalent organic framework (TD-COF) and indium sulfide (In2S3), engineered to enable efficient electrochemical uranium capture. The heterostructure establishes an internal electric field that promotes directional charge transfer, enhances carrier separation, and increases the accessibility of redox-active sites. As a result, the optimized TD-COF@IS-2 electrode exhibited a high uranium uptake capacity (up to 778.8 mg g-1) with pronounced selectivity under complex ionic conditions and stable cycling performance, while its effective and selective electrochemical uranium extraction was further validated in real seawater. Ex-situ characterizations combined with theoretical calculations elucidate both the interfacial electrosorption behavior of uranyl ions and the intrinsic mechanism of heterostructure-enhanced uranyl adsorption. This work demonstrates a viable strategy for designing heterojunction electrodes for selective ion capture and provides insights into interfacial charge engineering for electrochemical separations.
PMID:
42372336
Bibliographic data and abstract were imported from PubMed on 30 Jun 2026.
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