Polymer-supported graphene–TiO2 doped with nonmetallic elements with enhanced photocatalytic reaction under visible light

Exploiting photocatalysts with environmental friendliness, noble-metal-free and high efficiency is a great challenge for photocatalytic hydrogen evolution under visible light. In this work, we had successfully loaded anatase titanium dioxide with a special graphene structure [the reduced graphene ox...

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Bibliographic Details
Published in:Journal of materials science 2020-02, Vol.55 (4), p.1577-1591
Main Authors: Wu, Yuanwang, Mu, Haiyan, Cao, Xuejun, He, Xiao
Format: Article
Language:English
Subjects:
Anatase
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Degradation
Density functional theory
Electronic Materials
First principles
Graphene
Hydrogen evolution
Light
Materials Science
Mathematical analysis
Microspheres
Noble metals
Performance enhancement
Photocatalysis
Photocatalysts
Polymer Sciences
Solid Mechanics
Titanium
Titanium dioxide
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Summary:Exploiting photocatalysts with environmental friendliness, noble-metal-free and high efficiency is a great challenge for photocatalytic hydrogen evolution under visible light. In this work, we had successfully loaded anatase titanium dioxide with a special graphene structure [the reduced graphene oxide loaded on amine-functionalized poly (styrene/glycidyl methacrylate) (rGO/PSGM) microspheres. This special structure could greatly improve the catalytic performance of TiO 2 in the visible light. The nonmetallic elements (C, N, F, P and S) were doped with TiO 2 to further improve the performance of the composite photocatalysts in the visible-light region. After the first-principles density functional theory calculation, the calculated results of the density of states and dielectric function showed that the doped N element has the highest optical absorption capacity. We had proved this through experimental synthesis. Under the full-wavelength illumination, the degradation rate was 20 times higher than that of physically mixed sample; under the visible light, the k value of the degradation rate was 0.0046 min −1 while physically mixed sample had almost no reaction within 5 h. Our study provides a promising approach to achieving efficient photocatalytic reaction under visible light based on TiO 2 and graphene without precious metals.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-019-04100-8