Microwave-assisted construction of 2D/2D direct Z-scheme g-C3N4/Bi4O5Br2 heterojunctions with enhanced molecular oxygen activation for boosting selective photocatalytic conversion of benzyl alcohol

被引:6
作者
Li, Chenyu [1 ]
Fan, Yajun [1 ]
Gu, Songting [1 ]
Xiao, Yingxi [1 ]
Zhao, Xiaoyang [2 ]
Nan, Junmin [1 ]
Xiao, Xin [1 ]
机构
[1] South China Normal Univ, Sch Chem, MOE Key Lab Theoret Chem Environm, Guangzhou 510006, Peoples R China
[2] Henan Polytech Inst, Dept Environm Engn, Nanyang 473009, Peoples R China
基金
中国国家自然科学基金;
关键词
Selective photocatalytic conversion; Direct Z-scheme heterojunction; van der Waals interaction; Molecular oxygen activation; C-H bond activation; ONE-POT SYNTHESIS; VISIBLE-LIGHT; OXIDATION; BENZALDEHYDE; DEGRADATION; HETEROSTRUCTURE; SEMICONDUCTORS; PERFORMANCE; FABRICATION; BI4O5BR2;
D O I
10.1016/j.apsusc.2023.157809
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
Novel 2D/2D g-C3N4/Bi4O5Br2 heterojunctions were constructed via a facile microwave-assisted tactic, which exhibited excellent selective photocatalytic oxidation of benzyl alcohol under blue LED light. The reaction rate of the optimized sample was approximately 9.2 and 5.3 times higher than those of g-C3N4 or Bi4O5Br2 alone, respectively, with more than 99% selectivity for benzaldehyde. DFT calculations and experimental studies showed that there was no chemical bonding between Bi4O5Br2 and g-C3N4, but a direct Z-scheme system was created through weak van der Waals interactions. Electron spin resonance and radical quenching experiments revealed that the primary reactive species in the photoreaction system were superoxide radicals (& BULL;O2-) and holes (h+). Accordingly, the boosted photocatalytic activity of g-C3N4/Bi4O5Br2 heterojunctions arose from its optimized energy band configuration and van der Waals Z-scheme system, which effectively activated molecular oxygen to generate & BULL;O2- and triggered the first step in the photoconversion of benzyl alcohol. This work demonstrates the crucial role of semiconductor band regulation in selective photocatalytic organic conversion and the effective activation of molecular oxygen by rational design of heterogeneous interfaces.
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页数:12
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