Modulation of Pt species on oxygen vacancies enriched TiO2 via UV illumination for photocatalytic performance optimization

被引：9
作者：
Ma, Xujun [1 ]
Wu, Jianan [1 ]
Xu, Liming [1 ]
Zhao, Bin [2 ]
Chen, Feng [1 ]
机构：
[1] East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China
[2] Shenzhen Univ, Coll Mat Sci & Engn, 1066 Xueyuan Ave, Shenzhen 518055, Guangdong, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2020年 / 586卷
基金：
中国国家自然科学基金;
关键词：
CO photocatalytic oxidation; Oxygen vacancy; Pt/TiO2; Redispersion; UV illumination pretreatment; CO OXIDATION; NANOPARTICLES; REDISPERSION; LIGHT; PT/TIO2; SURFACE; DISPERSION; PARTICLES; MECHANISM; CATALYSTS;
D O I：
10.1016/j.colsurfa.2019.124243
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Due to expense and rarity of Pt element, optimization of Pt would be of importance for developing highly active Pt/TiO2 catalysts with low Pt loading dosage. In this study, the Pt nanoparticles, located on the surface of oxygen vacancies enriched TiO2 (V-TiO2), are redispersed through a facile pretreatment under UV illumination with the contribution of surface oxygen vacancies. Such process subsequently leads to the optimization of surface active species (Pt-0, PtOads, and O-ads(-)) on Pt/V-TiO2, which promotes the photocatalytic performance of CO oxidation. With an appropriate Pt dispersion and an optimized proportion of active Pt species, Pt/V-TiO2 after 2.0 h UV illumination pretreatment (Pt/V-TiO2-2) shows the best photocatalytic performance. Pt/V-TiO2-2 displays ca. 21-fold photocurrent response and 1.7-fold boosted photoactivity compared to Pt/V-TiO2, respectively.
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页数：7
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