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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 4    August 2009

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Purifying behavior of photocatalytic TiO2 anodized in nitrate ion containing solution
Jin-Wook CHOI1, Seong-Eun LEE1, Byung-Gwan LEE1, Yong-Soo JEONG2, Han-Jun OH3, Choong-Soo CHI1

1. School of Advanced Materials Engineering, Kookmin University, Seoul, 136-702, Korea;
2. Korea Institute of Materials Science, Changwon, 641-831, Korea;
3. Department of Materials Science, Hanseo University, Seosan, 356-706, Korea

Abstract:Mesoporous titanium dioxide films were fabricated on titanium plates by micro-arc oxidation method. To increase the photocatalytic activity of the films, NH4NO3 was added to the H2SO4 solution, and anodizing was carried out at high voltages using a DC power supply. The crystal structure, chemical composition, surface morphology and the optical property of the films were investigated by XPS, XRD, UV-VIS spectroscopy and SEM. The photocatalytic activity of the films was evaluated by the decomposition of aniline blue, and the activity of the films for the degradation turned out to be improved by the additives to the electrolyte solution. The enhanced photocatalytic activity might result from the increased porosity and nitrate ion incorporation into the anodic films by micro arcing, and thereby the TiO2 layer might exhibit an improved absorption property for the visible light.

 

Key words: photocatalysis; TiO2; anodizing; nitrate ion; micro-arc oxidation

ISSN 1672-7029
CN 43-1423/U

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