Electron-rich/poor reaction sites enable ultrafast confining Fenton-like processes in facet-engineered BiOI membranes for water purification

Qu, Wei ¹Chen, Cheng ¹Tang, Zhuoyun ¹Xia, Dehua ¹Ma, Dingren ¹Huang, Yajing ¹Lian, Qiyu ¹He, Chun ¹Shu, Dong ²Han, Bin³

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作者信息

1. Sun Yat sen Univ
2. Power Generat Guangdong Univ
3. Guangdong Univ Technol
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Abstract

Heterogeneous Fenton-reaction accomplishes the destruction of pollutants via the oxidation of hydroxyl radicals during water purification. Herein, two facet-engineered (control of different exposed crystal planes) BiOI nanocatalysts (BI-001 and BI-110) as the dual-reaction-center catalysts were loaded on the polyvinylidene fluoride membrane, remarkably accelerating the occurrence of Fenton-reaction and leading to the enhanced degradation of the pollutants in complex water matrices. The degradation efficiency of paracetamol by BI-110 membrane (~96.0%) was significantly higher than that of BI-001 membrane (~26.1%) in catalytic activity. The electron paramagnetic resonance tests and theoretical calculations proved that BI-110 possesses more oxygen vacancies, which acts as the electron-rich sites to trigger the Fenton-reaction. Correspondingly, the pollutants were adsorbed on the electron-poor Bi3+ sites and donate electrons during the degradation process. This study provides a candidate strategy to break the limitations of Fenton reaction advanced oxidation processes for water purification using the tunable facet-engineered BiOI membrane.

Key words

Facet-engineered BiOI membranes/Electron-rich/poor centers/Confinement/Oxygen vacancies/Water purification/CATALYTIC-ACTIVITY/OXYGEN-VACANCY/ACTIVATION/DEGRADATION/OXIDATION/PEROXYMONOSULFATE/MICROSPHERES/POLLUTANTS/GENERATION/EFFICIENCY

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量27

参考文献量38

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