V2C MXene-modified g-C3N4 for enhanced visible-light photocatalytic activity

被引:27
作者
Xu, Ruizheng
Wei, Guiyu
Xie, Zhemin
Diao, Sijie
Wen, Jianfeng
Tang, Tao
Jiang, Li
Li, Ming [1 ]
Hu, Guanghui [1 ]
机构
[1] Guilin Univ Technol, Coll Sci, Educ Dept Guangxi Zhuang Autonomous Reg, Guilin 541004, Peoples R China
基金
中国国家自然科学基金;
关键词
Photocatalyst; Cocatalyst; Charge transfer; Separation efficiency; g-C3N4; V(2)CMXene; CARBON NITRIDE; CONSTRUCTION; DEGRADATION; NANOSHEETS;
D O I
10.1016/j.jallcom.2023.172656
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Increasing the efficiency of charge transfer and separation efficiency of photogenerated carriers are still the main challenges in the field of semiconductor-based photocatalysts. Herein, we synthesized g-C3N4@V2C MXene photocatalyst by modifying g-C3N4 using V2C MXene. The prepared photocatalyst exhibited outstanding photocatalytic performance under visible light. The degradation efficiency of methyl orange by g-C3N4@V2C MXene photocatalyst was as high as 94.5%, which is 1.56 times higher than that by g-C3N4. This was attributed to the V2C MXene inhibiting the rapid recombination of photogenerated carriers and facilitating rapid transfer of photogenerated electrons (e(-)) from g-C3N4 to MXene. Moreover, g-C3N4@V2C MXene photocatalyst showed good cycling stability. The photocatalytic performance was higher than 85% after three cycles. Experiments to capture free radicals revealed that superoxide radicals (<middle dot>O-2(-)) are the main contributors to the photocatalytic activity. Thus, the proposed g-C3N4@V2C MXene photocatalyst is a promising visible-light catalyst.
引用
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页数:10
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