Citation: CHEN Jia, ZHANG Jiang, LI Xuan-Ke, YUAN Guan-Ming, DONG Zhi-Jun, CONG Ye, LI Yan-Jun, CUI Zheng-Wei. Controllable Oxidation Preparation and Performances of Hollow Ta₂O₅/TiO₂ Composite Photocatalysts[J]. Chinese Journal of Inorganic Chemistry, ;2017, 33(6): 1015-1022. doi: 10.11862/CJIC.2017.121 shu

Controllable Oxidation Preparation and Performances of Hollow Ta₂O₅/TiO₂ Composite Photocatalysts

CHEN Jia ^1,2 ,
ZHANG Jiang ^1,2,*,, ,
LI Xuan-Ke ^1,2,*,, ,
YUAN Guan-Ming ² ,
DONG Zhi-Jun ² ,
CONG Ye ² ,
LI Yan-Jun ² ,
CUI Zheng-Wei ²

1.
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2.
Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

Corresponding author: ZHANG Jiang, zhangjiang@wust.edu.cn LI Xuan-Ke, xkli8524@sina.com
Received Date: 20 January 2017
Revised Date: 20 April 2017

Figures(10)

Using Ti and Ta powders as raw materials, carbon black as the reactive template, the nanosized carbide coating of TaTiC₂ were grown in situ on the surface of carbon black by molten salt reaction. And using the as-prepared TaTiC₂/C composites as the carbide precursors, the hollow Ta₂O₅/TiO₂ composite photocatalysts were prepared by the controllable oxidation. The morphology, microstructure and pore structure of as-synthesized photocatalyst were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy (DRS) and N₂ physical adsorption measurements. With methylene blue as the aimed degradation pollutant and mercury lamp as light source, The photocatalytic activities of hollow Ta₂O₅/TiO₂ composite photocatalysts were evaluated by the photocatalytic degradation of methylene blue solution. Results indicated that the carbide coatings synthesized by molten salt reaction have uniform thickness (20~30 nm). TaTiC₂ was the main crystalline phase of carbide and had nanosized particle size. The hollow Ta₂O₅/TiO₂ composite photocatalysts have hollow macroporous structure of about 200 nm and mesoporous structure of about 10 nm in the shell. The existence of hollow macropores and mesopores can improve the adsorption of as-prepared photocatalysts for methylene blue. In addition, the coupling of electronic energy band structures of TiO₂ and Ta₂O₅ can enhance the separation efficiency of photogenerated electrons and holes remarkably. Furthermore, the photocatalytic activity was improved observably. When the n_Ti:n_Ta is 2.5:1.5, the corresponding hollow Ta₂O₅/TiO₂ composite photocatalyst exhibits the highest photocatalytic activity, and the ultraviolet light photocatalytic degradation rate for methylene blue is up to 97%.
- molten salt,
- controllable oxidation,
- hollow,
- carbide coating,
- Ta₂O₅/TiO₂,
- photocatalysis
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沈阳化工大学材料科学与工程学院沈阳 110142

Controllable Oxidation Preparation and Performances of Hollow Ta2O5/TiO2 Composite Photocatalysts

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通讯作者: 陈斌, bchen63@163.com

Controllable Oxidation Preparation and Performances of Hollow Ta₂O₅/TiO₂ Composite Photocatalysts