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Coatings 2015, 5(3), 545-556; doi:10.3390/coatings5030545

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

1
Graduate School, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
2
College of Mechanical Engineering, Tianjin University of Science and Technology, No.1038, Dagu Nanlu, Hexi District, Tianjin 300222, China
3
Graduate School & Faculty of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
4
Chiba Industrial Technology Research Institute, 6-13-1, Tendai, Inage-ku, Chiba 263-0016, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Joaquim Carneiro
Received: 4 August 2015 / Revised: 8 September 2015 / Accepted: 10 September 2015 / Published: 11 September 2015
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Abstract

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 (XR) 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. View Full-Text
Keywords: Cr-TiO2; composite coatings; oxidation condition; mixed-phase; phase transformation Cr-TiO2; composite coatings; oxidation condition; mixed-phase; phase transformation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Guan, S.; Hao, L.; Lu, Y.; Yoshida, H.; Asanuma, H. Fabrication of Photocatalyst Composite Coatings of Cr-TiO2 by Mechanical Coating Technique and Oxidation Process. Coatings 2015, 5, 545-556.

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