Citation: Sun Sijia, Ding Hao, Mei Lefu, Chen Ying, Hao Qiang, Chen Wanting, Xu Zhuoqun, Chen Daimei. Construction of SiO₂-TiO₂/g-C₃N₄ composite photocatalyst for hydrogen production and pollutant degradation: Insight into the effect of SiO₂[J]. Chinese Chemical Letters, ;2020, 31(9): 2287-2294. doi: 10.1016/j.cclet.2020.03.026 shu

Construction of SiO₂-TiO₂/g-C₃N₄ composite photocatalyst for hydrogen production and pollutant degradation: Insight into the effect of SiO₂

Sun Sijia ^a ,
Ding Hao ^a,*, ,
Mei Lefu ^a,*, ,
Chen Ying ^a ,
Hao Qiang ^b ,
Chen Wanting ^a ,
Xu Zhuoqun ^a ,
Chen Daimei ^a,*,

a.
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
b.
Centre for Technology in Water and Wastewater(CTWW), School of Civil and Environmental Engineering, University of Technology Sydney(UTS), Ultimo, NSW 2007, Australia

dinghao113@126.com

mlf@cugb.edu.cn

chendaimei@cugb.edu.cn

Received Date: 31 December 2019
Revised Date: 11 February 2020
Accepted Date: 1 March 2020
Available Online: 9 March 2020

Figures(6)

Using low-cost precipitated silica (SiO₂) as the carrier, a ternary SiO₂-TiO₂/g-C₃N₄ composite photocatalyst was prepared via the sol-gel method associated with a wet-grinding process. The as-prepared composite exhibits photocatalytic hydrogen production and pollutant degradation performance under solar-like irradiation. The effect of SiO₂ carrier on the properties of the heterostructure between TiO₂ and g-C₃N₄ (CN) was systematically studied. It is found that SiO₂ has important effects on promoting the interaction between TiO₂ and CN. The particle size of TiO₂ and CN was obviously reduced during the calcination process due to the effects of SiO₂. Especially, the TiO₂ particles exhibit monodispersed state with particle size below 10 nm (quantum dots), resulting in the improvement of the contact area and the interaction betweenTiO₂ and CN, and leading to the formation of efficient TiO₂/CN Z-scheme heterostructure in SiO₂-TiO₂/CN. Besides, the introduction of SiO₂ can increase the specific surface area and light absorption of SiO₂-TiO₂/CN, further promoting the photocatalytic reaction. As expected, the optimum SiO₂-TiO₂/CN composite exhibits 12.3, 3.1 and 2.9 times higher photocatalytic hydrogen production rate than that of SiO₂-TiO₂, CN and TiO₂/CN under solar-like irradiation, while the photocatalytic active component in SiO₂-TiO₂/CN is only about 60 wt%. Moreover, the rhodamine B degradation rate of SiO₂-TiO₂/CN is also higher than that of SiO₂-TiO₂, CN and TiO₂/CN.
- SiO₂ carrier,
- Heterostructure,
- Photocatalyst,
- g-C₃N₄,
- TiO₂
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Construction of SiO2-TiO2/g-C3N4 composite photocatalyst for hydrogen production and pollutant degradation: Insight into the effect of SiO2

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通讯作者: 陈斌, bchen63@163.com

Construction of SiO₂-TiO₂/g-C₃N₄ composite photocatalyst for hydrogen production and pollutant degradation: Insight into the effect of SiO₂