Enhanced Selective Photooxidation of Toluene to Benzaldehyde over Co3O4‐Modified BiOBr/AgBr S‐Scheme Heterojunction. Issue 8 (31st May 2022)

• Record Type: Journal Article
• Authors: Deng, Jie; Lei, Wanying; Fu, Junwei; Jin, Huile; Xu, Quanlong; Wang, Shun
• Is Part Of: Solar RRL. Volume 6:Issue 8(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-31
• Subjects: Co3O4/BiOBr/AgBr -- selective photooxidation -- S-scheme heterojunctions -- toluene oxidation; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.202200279
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : Herein, photocatalytic selective oxidation of hydrocarbons through O2 represents a promising way for fine chemical industry on account of its mild reaction condition. In this work, Co3 O4 ‐modified BiOBr/AgBr S‐scheme heterojunction can effectively oxidize sp 3 CH bonds at benzylic position to its corresponding aldehydes, with a toluene to benzaldehyde selectivity of 94%, which is much higher than that of pure BiOBr (21.7%) and AgBr (58.9%). A unique S‐scheme charge‐transfer mode is confirmed for the ternary composites by the X‐ray photoelectron spectroscopy and reactive species quenching measurement. The remaining photogenerated electrons in AgBr with powerful reduction ability can react with O2 to generate O2 − species, which can further oxidize the benzyl radical formed on the Co3 O4 surface to peroxyl radicals and then thermodynamically decompose to benzaldehyde. Herein, this work has important guiding significance for the structure regulation of photocatalysts and application in selective oxidation of sp 3 CH bond of hydrocarbons. Abstract : As confirmed by the X‐ray photoelectron spectroscopy and active species quenching measurement, Co3 O4 ‐modified BiOBr/AgBr heterojunction displays an S‐scheme charge transfer mode, thus possessing high charge separation efficiency and strong redox abilities. As a result, the ternary can effectively oxidize C(sp 3 )H bonds at benzylic position to its corresponding aldehydes, with a toluene to benzaldehyde selectivity of 94%.