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Citation: LIU Shou-Xin, CHEN Guang-Sheng, CHEN Xiao-Yun, CHEN Xi, SUN Cheng-Lin. Electro-Photocatalytic Degradation of Phenol in Wastewater Using Ag/TiO₂ Photocatalysts[J]. Chinese Journal of Applied Chemistry, ;2005, 22(8): 840-843. shu

Electro-Photocatalytic Degradation of Phenol in Wastewater Using Ag/TiO₂ Photocatalysts

1.
a College of Material Science and Engineering, Northeast Forestry University, Harbin 150040;
2.
b Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023

Corresponding author: LIU Shou-Xin,
Received Date: 20 September 2004
Available Online: 15 February 2005
Fund Project: 国家自然科学基金(30400339) (30400339)黑龙江省自然科学基金(C2004-29)资助项目 (C2004-29)

In the present work,suspended Ag/TiO₂ was used as the catalyst,Ti mesh as the electrode,and a three-dimension electrode of Ti/Ag/TiO₂ was constructed.The effect of enforced electric field was observed,and the electro-photocatalytic degradation of phenol in aqueous solution at the prepared electrode were evaluated.The results show that the anode potential bias favors the photocatalytic degradation of phenol.The maximum phenol removal efficiency was achieved when TiO₂ ith 1.5% silver loading was used.Two optimal voltage values for the Ag/TiO₂ electro-photocatalysis reaction were 20 and 10 V,respectively.Addition of electrolyte NaCl increased the phenol removal efficiency of Ag/TiO₂ electro-photocatalysis from 49.7% to 93.6%.Enforced electric field can drive photogenerated electrons away from the photocatalyst surface,and the enhanced photocatalytic activity is mainly caused by the low recombination rate of electrons and holes and the higher rate of electron transfer to adsorbed oxygen.
- Ag/TiO₂,
- electro-photocatalysis,
- phenol,
- electrolyte
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Electro-Photocatalytic Degradation of Phenol in Wastewater Using Ag/TiO₂ Photocatalysts