Fabrication and photocatalytic activity of MAO–TiO₂ films formed on titanium doped with cations

N. XiangSchool of Materials Science and Engineering, Changzhou University, Changzhou213164, China;Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou213164, China

J. J. ZhuangSchool of Materials Science and Engineering, Changzhou University, Changzhou213164, China;Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou213164, China

R. G. SongSchool of Materials Science and Engineering, Changzhou University, Changzhou213164, China;Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou213164, ChinaCorrespondence[email protected]

B. XiangCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou310032, China

Y. XiongCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou310032, China

X. P. SuSchool of Materials Science and Engineering, Changzhou University, Changzhou213164, China;Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou213164, China

Abstract

The microarc oxidation (MAO) TiO₂ films were fabricated in phosphate based electrolyte under different voltages on titanium to study the optimum voltage for photocatalysis, and then the doping process was carried out under the optimum condition above. The surface morphology and composition of MAO films were examined by scanning electron microscopy and X-ray diffraction. The photocatalytic activities of MAO films with and without cation dopant were evaluated by photocatalytic decolourisation of methylene blue in aqueous solution as a model pollutant under simulated sunlight irradiation. The results showed that the photocatalytic activity of MAO–TiO₂ films first increased and then decreased with increasing the voltage, and the cation dopant enhanced the photocatalytic activity of MAO–TiO₂ films. Moreover, the transition metal cation Cu²⁺ was more suitable for dope than the rare earth metal cation Ce⁴⁺ to some extent.

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Fabrication and photocatalytic activity of MAO–TiO₂ films formed on titanium doped with cations