Citation: TIAN Hong, WANG Hui-Xiang, SHI Wei-Mei, XU Yao. Microwave-Assisted Solvothermal Synthesis of In-Si Co-Modified TiO₂ Photocatalysts with Enhanced Photocatalytic Activity[J]. Acta Physico-Chimica Sinica, ;2014, 30(8): 1543-1549. doi: 10.3866/PKU.WHXB201406161 shu

Microwave-Assisted Solvothermal Synthesis of In-Si Co-Modified TiO₂ Photocatalysts with Enhanced Photocatalytic Activity

1.
1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China;
2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, Sichuan Province, P. R. China

Received Date: 13 February 2014
Available Online: 16 June 2014
Fund Project:

In-Si co-modified TiO₂ photocatalysts were synthesized via a microwave-assisted solvothermal method. The obtained materials were characterized by X-ray diffraction (XRD), Raman spectroscopy, N₂ addesorption (BET), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, and UVVis diffuse reflectance spectroscopy (UV-Vis DRS). The photocatalysts all exist in an anatase phase, despite the fact that the crystallinity slightly decreased upon modification of the TiO₂ photocatalysts. Si-modification resulted in smaller nanoparticles and larger specific surface areas. In-modification led to the formation of In₂O₃ on the surface of TiO₂, such that In cannot enter the TiO₂ lattice, contributing to efficient charge transfer between the coupled semiconductors In₂O₃ and TiO₂. Degradation of Rhodamine B (RhB) showed that In-Si co-modified TiO₂ photocatalysts can exhibit high photocatalytic activity under both ultraviolet and visible light. The highest activity was obtained for In-Si co-modified TiO₂ with an Si:In:Ti molar ratio of 0.03:0.02:1 (IST-2), with which RhB was completely degraded within 3 min under ultraviolet light and where 97% of RhB was degraded after 120 min under visible light. The improved photocatalytic activity of In- Si co-modified TiO₂ may be ascribed to synergistic effects between large surface area, efficient electron transmission at the In₂O₃-TiO₂ interface, and the dye sensation effect of RhB. Photodegradation for colorless phenol occurred at a much slower rate than that for RhB, and the phenol did not completely degrade within 700 min.
- TiO₂,
- In₂O₃,
- Photocatalysis,
- Modification,
- Doping
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沈阳化工大学材料科学与工程学院沈阳 110142

Microwave-Assisted Solvothermal Synthesis of In-Si Co-Modified TiO2 Photocatalysts with Enhanced Photocatalytic Activity

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通讯作者: 陈斌, bchen63@163.com

Microwave-Assisted Solvothermal Synthesis of In-Si Co-Modified TiO₂ Photocatalysts with Enhanced Photocatalytic Activity