In situ construction of a 2D/2D SnS 2 /MXene heterojunction for visible-light photocatalytic uranium reduction

The photocatalytic reduction of soluble U( vi ) into insoluble species presents a promising technique for removing radioactive uranium species from solution. The critical aspect in this field lies in the development of high-performance photocatalysts. Herein, a MXene (Ti 3 C 2 ) and 2D SnS 2 nanoshe...

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Published inCatalysis science & technology Vol. 14; no. 13; pp. 3748 - 3755
Main Authors Luo, Jianqiang, Xiong, Hao, Jiang, Hongxia, Li, Jiaqi, Meng, Chen, Liu, Shujuan, Ma, Jianguo
Format Journal Article
LanguageEnglish
Published 01.07.2024
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Summary:The photocatalytic reduction of soluble U( vi ) into insoluble species presents a promising technique for removing radioactive uranium species from solution. The critical aspect in this field lies in the development of high-performance photocatalysts. Herein, a MXene (Ti 3 C 2 ) and 2D SnS 2 nanosheet composite is synthesized by a one-step hydrothermal method. The as-synthesized SnS 2 /MXene heterostructure can reduce 93% of U( vi ) under visible light irradiation in 200 min, which is 25% higher than pure SnS 2 . In addition, SnS 2 /MXene exhibited high stability and can endure more than 6 photocatalytic cycles, with the removal ratio of U( vi ) remaining above 84%. Based on XPS, UV-vis, and PL analyses, the construction of a SnS 2 /MXene heterojunction not only improves the adsorption capability of visible light but also augments the efficiency of charge separation and transport. Additionally, DFT calculations further corroborate this enhancement mechanism by elucidating the formation of a built-in electric field between SnS 2 and MXene slabs.
ISSN:2044-4753
2044-4761
DOI:10.1039/D4CY00348A