首页|Cs3Bi2Br9/BiOBr S-scheme heterojunction for selective oxidation of benzylic C-H bonds

Cs3Bi2Br9/BiOBr S-scheme heterojunction for selective oxidation of benzylic C-H bonds

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Converting hydrocarbons into aldehydes in a green and environmentally benign way is of great signif-icance in fine chemistry.In this work,all-inorganic Cs3Bi2Br9 perovskite nanoparticles were uniformly loaded on BiOBr nanosheets via an in-situ growth method,which can selectivity photoactivate aromatic C(sp3)-H bond of toluene to generate benzaldehyde.According to the in-situ X-ray photoelectron spec-troscopy characterization,the photogenerated electrons of BiOBr transfer to Cs3Bi2Br9 enforced by the in-ternal electric field under light irradiation,resulting in S-scheme heterojunction.Furthermore,theoretical calculations indicate that toluene molecules are inclined to adsorb on the BiOBr surface,subsequently in-volving the oxidation reaction to generate benzyl radical(PhCH2·)by using the energetic holes of BiOBr,while the remaining photoinduced electrons in the conduction band(CB)of Cs3Bi2Br9 with powerful reduction ability reduce O2 into·O2-,which is the vital oxidative active species working on toluene selective oxidation process.Such an unexceptionable charge carrier utilization mode and tendentious ad-sorption behavior of reactants contribute to the optimized Cs3Bi2Br9/BiOBr heterojunction with excellent photocatalytic performance,achieving a maximum of 22.5％toluene conversion and 96.2％selectivity to-wards benzaldehyde formation.This work provides a rational photocatalyst heterojunction construction protocol for the selective oxidation of saturated aromatic C-H bonds.

Cs3Bi2Br9/BiOBrC(sp3)-H activationS-scheme heterojunctionSelective organic synthesisPhotocatalysis

Jie Deng、Difa Xu、Jinfeng Zhang、Quanlong Xu、Yun Yang、Zhiyi Wei、Zhi Su

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Wenzhou Key Lab of Advanced Energy Storage and Conversion,Zhejiang Province Key Lab of Leather Engineering,College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325027,China

Hunan Key Laboratory of Applied Environmental Photocatalysis,Changsha University,Changsha 410022,China

Anhui Key Laboratory of Energetic Materials,College of Physics and Electronic Information,Huaibei Normal University,Huaibei 235000,China

School of Energy and Chemical Engineering,Xinjiang Institute of Technology,Akesu 843100,China

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国家自然科学基金国家自然科学基金国家自然科学基金新疆维吾尔自治区自然科学基金

2190520952171145519730782020D01B25

2024

10.1016/j.jmst.2023.04.053

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.180(13)
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