Effects of Surface Treatment on Photocattalytic Activity of TiO₂ Coatings Using Microarc-Oxidation

Abstract:

Titanium oxide coatings （Ti/TiO₂）were formed on the titanium net surface by micro-arc oxidation(MAO) in Na₃PO₄ solution using an AC power supply. Then the titanium oxide coatings were treated by acetic acid or La(NO₃)₃ aqueous solution to improve its activity. The structures and photocatalytic ability of titanium oxide coatings before and after surface treatment were characterized and evaluated by XRD, SEM, EDX. It was found that the titanium oxide film is mainly made of titanium and anatase .When acetic acid aqueous concentration is 0.1mol•L^-1 and soak time is 6 hour ,the Ti/TiO₂ films photocatalytic degradation rate increased from 15% to 33.6%. When La(NO₃)₃ aqueous concentration is 0.1mol•L^-1 and soak time is 12 hour, the Ti/TiO₂ films photocatalytic degradation rate increased from 15% to 34.8%.

• Periodical: Advanced Materials Research (Volume 454)
• Pages: 26-29
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.454.26
• Online since: January 2012
• Authors: Hui Dong Su, Zhong Hua Shi
• Keywords: Micro-Arc Oxidation (MAO), Photocatalysis, Surface Treatment, TiO₂

References

[1] Fujishima A, honda K. Electrochemical photolysis of water at a semiconductor electrode[J].　Nature,(1972),p.238:37-38.

DOI: 10.1038/238037a0

[2] Liu K R, Han Q, Chan J S ,et al. A composite WO3-TiO2 photocatalyst for photodegration [J]. Journal of Northeastern university(Natural Science),Vol.24,(2003),pp.1064-1067

[3] Yu J.G., Yu H.G., Lei M,et al Effects of CH3COOHTreatment on Photocattalytic Activity of TiO2 Nanometer Thin Films[J].Acta Chimica Sinica,Vol.61,(2003),pp.1271-1275.

[4] Cui H,Dwighi K, Soled S, et al. Surface acidity and photocatalytic activity of Nb2/TiO2 photocatalysis [J]. Journal of Solid State Chemisty.Vol.115(1995),pp.187-191.

DOI: 10.1006/jssc.1995.1118

[5] Zhang X ,Zhao Y, Zhang C B. Synthesis of TiO2-SiO2 Ccmplex Material and Its photocatalytic Property[J]. Journal of Northeastern university(Natural Science),Vol.25(2004),pp.269-272.

[6] D.Robert .Photocatalytic detoxification with TiO2 supported on glass-fiber by using artificial and natural light[J].Catalysis Today 54(1999),pp.291-296.

DOI: 10.1016/s0920-5861(99)00190-x

[7] Wang Y M ,Jiang B L,Guo L X. Growth and microstructure of microarc oxidation coatings on titanium alloy in solution containing phosphate. [J]The Chinese Journal of Nonferrous Metal. Vol. 14,(2004),pp.548-553.

DOI: 10.1016/j.apsusc.2004.03.231

[8] Yu H.L. Shui M., Xu T.D,et al.The A-R transformation and photocatalytic activity of mixed TiO2 rare earth oxides[J].JournalofZhejiang university(sciences edition).Vol.27,(2000) ,pp.69-74.