Bui, Hoang Tran Weon, Seunghyun Bae, Ji Won Kim, Eun-Ju Kim, Bupmo Ahn, Yong-Yoon Kim, Kitae Lee, Hangil Kim, Wooyul 2024-01-19T15:30:59Z 2024-01-19T15:30:59Z 2021-09-02 2021-02-15 0304-3894 https://pubs.kist.re.kr/handle/201004/117400 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 O-2 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 O-2, and (ii) photo-generated 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. English ELSEVIER TITANIUM-DIOXIDE SUSPENSIONS DOPED CEO2 SURFACE FLUORINATION ORGANIC POLLUTANTS CO OXIDATION DEGRADATION LIGHT TIO2 PERFORMANCE CATALYSTS Oxygen vacancy engineering of cerium oxide for the selective photocatalytic oxidation of aromatic pollutants Article 10.1016/j.jhazmat.2020.123976 1 JOURNAL OF HAZARDOUS MATERIALS, v.404 JOURNAL OF HAZARDOUS MATERIALS 404 scie scopus 000634297700005 2-s2.0-85092633771 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article TITANIUM-DIOXIDE SUSPENSIONS DOPED CEO2 SURFACE FLUORINATION ORGANIC POLLUTANTS CO OXIDATION DEGRADATION LIGHT TIO2 PERFORMANCE CATALYSTS CeO2 Oxygen vacancy Photocatalytic mild oxidation