Stepwise construction of Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and magnetic separability for efficient visible-light photocatalysis
Author | Li, Zhijian |
Author | Wang, Yao |
Author | Elzatahry, Ahmed A. |
Author | Yang, Xuanyu |
Author | Pu, Shouzhi |
Author | Luo, Wei |
Author | Cheng, Xiaowei |
Author | Deng, Yonghui |
Available date | 2020-08-18T08:34:45Z |
Publication Date | 2019 |
Publication Name | Chinese Chemical Letters |
Resource | Scopus |
ISSN | 10018417 |
Abstract | Solid photocatalysts with high specific surface area, superior photoactivity and ease of recycling are highly desired in chemical process, water treatment and so on. In this study, a facile stepwise sol-gel coating approach was utilized to synthesize Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and convenient magnetic separability (denoted as Fe3O4@SiO2@Pt/mTiO2-x). These photocatalysts consist of magnetic Fe3O4 cores, nonporous insulating SiO2 middle layer and mesoporous anatase TiO2-x shell decorated by Pt nanoparticles (?3.5 nm) through wet impregnation and H2 reduction. As a result of high activity of oxygen-deficiency of black TiO2-x by H2 reduction and efficient inhibition of electron-hole recombination by Pt nanoparticles, the rationally designed core-shell Fe3O4@SiO2@Pt/mTiO2-x photocatalysts exhibit superior photocatalytic performance in rhodamine B (RhB) degradation under visible light irradiation, with more than 98% of RhB degraded within 50 min. These core-shell structured photocatalysts show excellent recyclability under the assistance of magnetic separation with well-retained photocatalytic performance even after running five cycles. This stepwise synthesis method paves the way for the rational design of a high-efficiency recyclable heterogeneous catalyst, including photocatalysts, for various applications. - 2019 |
Sponsor | This work was supported by the National Natural Science Foundation of China (Nos. 51372041 , 51422202 , 21673048 , 21875044 , 51822202 and 51772050 ), Key Basic Research Program of Science and Technology Commission of Shanghai Municipality (No. 17JC1400100 ), Youth Top-notch Talent Support Program of China, Shanghai Rising-Star Program (No. 18QA1400100 ) and DHU Distinguished Young Professor Program . |
Language | en |
Publisher | Elsevier B.V. |
Subject | Core-shell Magnetic recovery Mesoporous TiO2 Photocatalytic activity Visible light |
Type | Article |
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