微波辅助溶剂热合成In-Si共改性TiO2的增强光催化性能

doi:10.3866/PKU.WHXB201406161

Abstract

Abstract:

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.

Key words: TiO₂, In₂O₃, Photocatalysis, Modification, Doping

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 Phys. -Chim. Sin. 2014, 30(8), 1543-1549. doi: 10.3866/PKU.WHXB201406161

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

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