Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (09): 971-976.doi: 10.3866/PKU.WHXB20050906

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Photocatalytic Oxidation of Methyl Red by TiO2 in a Photoelectrochemical Cell

SHI Jing-ying; LENG Wen-hua; CHENG Xiao-fang; ZHANG Jian-qing; CAO Chu-nan   

  1. Department of Chemistry, Yuquan Campus, Zhejiang University, Hangzhou 310027; Department of Chemistry, Quanzhou Normal College, Quanzhou 362000
  • Received:2004-12-14 Revised:2005-02-25 Published:2005-09-15
  • Contact: LENG Wen-hua E-mail:lengwh@css.zju.edu.cn

Abstract: The kinetics for photocatalytic degradation reaction of methyl red, an azo dye, was investigated in a photoelectrochemical (PEC) cell, with titania thin film loaded on titanium as photoanode. The results showed that the degradation of methyl red was accelerated in PEC cell due to a reduced recombination of photogenerated carriers by the separation of the anodic and cathodic reactions. Under the same condition, an increase in photocurrent for PEC cell will suggest an improved rate of degradation. A thin SnO2 film was applied as an interlayer between the substrate and the TiO2 coating to obtain the assembled photoanodes, Ti/SnO2/TiO2, leading to a more separation efficiency of photogenerated carriers. Meanwhile, the photocatalytic activities of the electrodes were estimated by the electrochemical impedance spectroscopy (EIS).

Key words: TiO2, Methyl red, Photoelectrochemical cell, EIS