Water enhances photocatalytic activity for toluene selective oxidation in acetic acid solution  

作　　者：Sheng Tian Jinxin Li Binghao Wang Xiong Wang Xingsheng Hu Huijuan Wang Lang Chen Shuang-Feng Yin 

机构地区：[1]Advanced Catalytic Engineering Research Center of the Ministry of Education,State Key Laboratory of Chemo/Biosensing and Chemometrics,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China [2]College of Chemistry and Chemical Engineering,Central South University of Forestry and Technology,Changsha 410004,China

出　　处：《Nano Research》2025年第3期223-233,共11页纳米研究(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22322804,21938002,and 22278119).

摘　　要：Photocatalytic oxidation of hydrocarbons to value-added oxygen-containing compounds is a green and sustainable method.However,the efficient activation of C(sp^(3))-H bonds under mild conditions remains a significant challenge.In this study,we prepared BiOBr/Bi_(2)MoO_(6)Z-scheme heterostructure for photocatalytic selective oxidation of toluene to benzaldehyde utilizing acetic acid as solvent.A small amount of water as an additive established an acidic environment to facilitate the formation of highly reactive hydroxyl radicals(·OH)through the O_(2)→·O_(2)^(−)→H_(2)O_(2)→·OH process.The·OH together with photogenerated holes acted as reactive species dissociate C(sp^(3))-H bonds,which is regarded as the rate-determining step for this reaction,boosting photocatalytic activity.Compared to the reaction system without water,the conversion of toluene increased from 23.6%to 39.0%,reaching a toluene conversion rate of 6110μmol·g^(-1)·h^(-1).Additionally,there is a slight improvement in the selectivity of benzaldehyde.

关 键 词：photocatalytic oxidation of toluene H_(2)O acidic chemical environment hydroxyl radicals BiOBr/Bi_(2)MoO_(6) 

分 类 号：O64[理学—物理化学]