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ELECTROCHEMICALLY ASSISTED PHOTOCATALYTIC DEGRADATION OF CHLOROPHENOLS USING TiO 2 MICROPOROUS FILM

Dai Qing, Guo Yan, Yuan Chunwei (National Laboratory of Molecular and Biomolecular Electronics, Southeast University, Nanjing 210096) Xi Rongbiao, Lin Baoping (Department of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096)  
TiO 2 thin film electrodes with microporous structure were prepared by film coating. Using the TiO 2 thin film electrode as working electrode, the electrochemically assisted photocatalytic system that had three kinds of electrodes (working electrode, reference electrode and counter electrode) was built. Selecting 4 chlorophenol (4 CP) and 2,4,6 trichlorophenol (TCP) solution as substrates, the photocatalytic degradation was studied. The results indicated that the benzene ring of 4 CP and TCP had been destroyed. Application of the anodic bias can restrain the reposition of photogenerated electron and hole, thus improve the photocatalytic efficiency of TiO 2 particles. It was also showed that the stronger the light intensity is, the higher the degradation efficiency.
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