Degradation of 2,4-dichlorophenol with a novel TiO2/Ti-Fe-graphite feltphotoelectrocatalytic oxidation process
ZHAO Bao-xiu , LI Xiang-zhong , WANG Peng
DOI:
Received September 27, 2006,Revised November 27, 2006, Accepted , Available online
Volume 19,2007,Pages 1020-1024
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Degradation of 2,4-dichlorophenol (2,4-DCP) was studied in a novel three-electrode photoelectrocatalytic (PEC) integrative
oxidation process, and the factors influencing the degradation rate, such as applied current, flow speed of O2, pH, adscititious voltage and
initial 2,4-DCP concentration were investigated and optimized. H2O2 was produced nearby cathode and Fe2+ continuously generated
from Fe anode in solution when current and O2 were applied, so, main reactions, H2O2-assisted TiO2 PEC oxidation and E-Fenton
reaction, occurred during degradation of 2,4-DCP in this integrative system. The degradation ratio of 2,4-DCP was 93% in this
integrative oxidation process, while it was only 31% in E-Fenton process and 46% in H2O2-assisted TiO2 PEC process. So, it revealed
that the degradation of 2,4-DCP was improved greatly by photoelectrical cooperation effect. By the investigation of pH, it showed that
this integrative process could work well in a wide pH range from pH 3 to pH 9.
