Citation: Shuangyu Wu, Jian Peng, Yue Jiang, Sijie Lin. The overlooked promotional effects of alcohols to BiOBr catalysts in photocatalytic degradation of organic pollutants[J]. Chinese Chemical Letters, ;2025, 36(11): 110819. doi: 10.1016/j.cclet.2025.110819 shu

The overlooked promotional effects of alcohols to BiOBr catalysts in photocatalytic degradation of organic pollutants

Shuangyu Wu ^{a, b} ,
Jian Peng ^{a, b} ,
Yue Jiang ^{a, b} ,
Sijie Lin ^{a, b, *,}

a.
College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, Tongji University, Shanghai 200092, China
b.
Key Laboratory of Yangtze River Water Environment, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, China

lin.sijie@tongji.edu.cn

Received Date: 10 September 2024
Revised Date: 13 November 2024
Accepted Date: 2 January 2025
Available Online: 2 January 2025

Figures(4)

Alcohols are often used as scavengers to identify the contribution of radicals for contaminant degradation in heterogeneous catalysis. The generation of alcohol radicals is often overlooked, leading to misinterpretation of degradation mechanisms and alcohol's role. Herein, a series of bismuth oxybromide (BiOBr) with varying amounts of active species was synthesized as representative catalysts to elucidate the role of alcohols in heterogeneous catalysis. Among various alcohols, isopropanol (IPA) was found to significantly enhance the photocatalytic degradation of carbamazepine (CBZ) by BiOBr. Electron paramagnetic resonance results confirmed that IPA was oxidized to alcohol radicals by BiOBr. The promotional effect of IPA was due to the generation of H₂O₂ through the reaction between alcohol radicals and dissolved oxygen. H₂O₂ subsequently led to the production of superoxide anion, the dominant radical in CBZ degradation. The promotional effect was also observed with other alcohols. The bond dissociation energy of the C–H bond adjacent to the hydroxyl group in alcohols determined the extent of promotion, while other characteristics such as the number of hydroxyl groups did not. Higher bond dissociation energy corresponded to a greater promotional effect. This study clarifies the inconsistent observations resulting from the use of various alcohols in heterogeneous catalysis and provides new insights into the overlooked role of alcohols.
- Alcohol radical,
- Scavenger,
- Promoter,
- Heterogeneous catalysis,
- BiOBr
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