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Efficient photodegradation of polystyrene microplastics integrated with hydrogen evolution: Uncovering degradation pathways.


ABSTRACT: Photocatalytic microplastics (MPs) conversion into valuable products is a promising approach to alleviate MPs pollution in aquatic environments. Herein, we developed an amorphous alloy/photocatalyst composite (FeB/TiO2) that can successfully convert polystyrene (PS) MPs to clean H2 fuel and valuable organic compounds (92.3% particle size reduction of PS-MPs and 103.5 μmol H2 production in 12 h). FeB effectively enhanced the light-absorption and carrier separation of TiO2, thereby promoting more reactive oxygen species generation (especially ‧OH) and combination of photoelectrons with protons. The main products (e.g., benzaldehyde, benzoic acid, etc.) were identified. Additionally, the dominant PS-MPs photoconversion pathway was elucidated based on density functional theory calculations, by which the significant role of ‧OH was demonstrated in combination with radical quenching data. This study provides a prospective approach to mitigate MPs pollution in aquatic environments and reveals the synergistic mechanism governing the photocatalytic conversion of MPs and generation of H2 fuel.

SUBMITTER: He J 

PROVIDER: S-EPMC10220245 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature

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Efficient photodegradation of polystyrene microplastics integrated with hydrogen evolution: Uncovering degradation pathways.

He Jiehong J   Han Lanfang L   Ma Weiwei W   Chen Liying L   Ma Chuanxin C   Xu Chao C   Yang Zhifeng Z  

iScience 20230506 6


Photocatalytic microplastics (MPs) conversion into valuable products is a promising approach to alleviate MPs pollution in aquatic environments. Herein, we developed an amorphous alloy/photocatalyst composite (FeB/TiO<sub>2</sub>) that can successfully convert polystyrene (PS) MPs to clean H<sub>2</sub> fuel and valuable organic compounds (92.3% particle size reduction of PS-MPs and 103.5 μmol H<sub>2</sub> production in 12 h). FeB effectively enhanced the light-absorption and carrier separation  ...[more]

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