Fabrication of TiO2/Ti electrode by laser-assisted anodic oxidation and its application on photoelectrocatalytic degradation of methylene blue

A TiO2/Ti mesh electrode by laser calcination was prepared in this article. The resulting TiO2 film was investigated by X-ray diffraction (XRD), atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS), and it illuminated that the prepared electrode mainly consisted of anatase...

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Bibliographic Details
Published in:Journal of hazardous materials 2007-01, Vol.139 (1), p.72-78
Main Authors: Li, Jiaqing, Zheng, Lei, Li, Luoping, Xian, Yuezhong, Jin, Litong
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pollution
Catalysis
Catalysis - radiation effects
Catalytic reactions
Chemical engineering
Chemistry
Electric Impedance
Electrodes
Electrolysis
Exact sciences and technology
General and physical chemistry
Hydrogen-Ion Concentration - radiation effects
Lasers
Methylene Blue - metabolism
Microscopy, Atomic Force
Oxidation-Reduction - radiation effects
Oxygen - metabolism
Pollution
Reactors
Spectrum Analysis
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Titanium - chemistry
Ultraviolet Rays
X-Ray Diffraction
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Summary:A TiO2/Ti mesh electrode by laser calcination was prepared in this article. The resulting TiO2 film was investigated by X-ray diffraction (XRD), atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS), and it illuminated that the prepared electrode mainly consisted of anatase TiO2 nanoparticles on its surface and exhibited a superior photocatalytic activity. The photodegradation of methylene blue (MB) using the proposed electrode under different experimental conditions was investigated in terms of both UV absorbance at 664 nm and chemical oxygen demand (COD) removal. The electrical bias applied in photoelectrocatalytic (PEC) oxidation was also studied. The experimental results showed that under the optimal potential of +0.50 V (versus SCE), UV absorbance and COD removal during the photodegradation of MB by the proposed TiO2/Ti mesh electrode were 97.3% and 87.0%, respectively. Through the comparison between photocatalytic (PC) oxidation and photoelectrocatalytic (PEC) oxidation, it was found that PEC oxidation was a convenient and effective way to mineralize the organic matters and that laser-treated photoelectrode exceeded the oven-treated one.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2006.06.003