Oxygen vacancy engineering of cerium oxide for the selective photocatalytic oxidation of aromatic pollutants
- Authors
- Bui, H.T.; Weon, S.; Bae, J.W.; Kim, E.-J.; Kim, B.; Ahn, Y.-Y.; Kim, K.; Lee, H.; Kim, W.
- Issue Date
- 15-2월-2021
- Publisher
- Elsevier B.V.
- Keywords
- CeO2; Oxygen vacancy; Photocatalytic mild oxidation
- Citation
- Journal of Hazardous Materials, v.404
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Hazardous Materials
- Volume
- 404
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/49386
- DOI
- 10.1016/j.jhazmat.2020.123976
- ISSN
- 0304-3894
- Abstract
- The engineering of oxygen vacancies in CeO2 nanoparticles (NPs) allows the specific fine-tuning of their oxidation power, and this can be used to rationally control their activity and selectivity in the photocatalytic oxidation (PCO) of aromatic pollutants. In the current study, a facile strategy for generating exceptionally stable oxygen vacancies in CeO2 NPs through simple acid (CeO2-A) or base (CeO2-B) treatment was developed. The selective (or mild) PCO activities of CeO2-A and CeO2-B in the degradation of a variety of aromatic substrates in water were successfully demonstrated. CeO2-B has more oxygen vacancies and exhibits superior photocatalytic performance compared to CeO2-A. Control of oxygen vacancies in CeO2 facilitates the adsorption and reduction of dissolved O2 due to their high oxygen-storage ability. The oxygen vacancies in CeO2-B as active sites for oxygen-mediated reactions act as (i) adsorption and reduction reaction sites for dissolved O2, and (ii) photogenerated electron scavenging sites that promote the formation of H2O2 by multi-electron transfer. The oxygen vacancies in CeO2-B are particularly stable and can be used repeatedly over 30 h without losing activity. The selective PCOs of organic substrates were studied systematically, revealing that the operating mechanisms for UV-illuminated CeO2-B are very different from those for conventional TiO2 photocatalysts. Thus, the present study provides new insights into the design of defect-engineered metal oxides for the development of novel photocatalysts. © 2020 Elsevier B.V.
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