Fabrication of Photocatalyst Composite Coatings of Cr-TiO2 by Mechanical Coating Technique and Oxidation Process

Coatings

Sujun Guan²  Liang Hao⁴  Yun Lu³  Hiroyuki Yoshida¹  Hiroshi Asanuma³ 

[1] Chiba Industrial Technology Research Institute, 6-13-1, Tendai, Inage-ku, Chiba 263-0016, Japan; E-Mail:;Graduate School, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan; E-Mail:;Graduate School & Faculty of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan; E-Mail:;College of Mechanical Engineering, Tianjin University of Science and Technology, No.1038, Dagu Nanlu, Hexi District, Tianjin 300222, China; E-Mail:

关键词: Cr-TiO₂;    composite coatings;    oxidation condition;    mixed-phase;    phase transformation;   

DOI  :  10.3390/coatings5030545

来源: mdpi

【 摘 要 】

The photocatalyst composite coatings on alumina (Al₂O₃) balls had been prepared by mechanical coating technique (MCT) with titanium (Ti) powder, adding a certain content of chromium (Cr) powder and a subsequent oxidation process. The effect of oxidation conditions and adding Cr on the composite coatings of chromium-titanium dioxide (Cr-TiO₂) was investigated. The results show Cr-TiO₂ coatings are with mixed-phase of anatase and rutile under different oxidation conditions, and the mass fraction of the rutile phase (X_R) has been obviously increased when under 973 K. The SEM images indicate that adding Cr could significantly accelerate the growth of surface structures, especially at 1073 K. The photocatalytic activity of Cr-TiO₂ coatings firstly increases, then decreases, with the addition of Cr. Compared with that of two other oxidation conditions, the enhancement on photocatalytic activity by adding Cr under visible light is relatively higher, especially at 973 K for 10 h.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.