Treatment of Organic Pollutants in Aqueous Solution by Homogenous and Heterogeneous Advanced Oxidation Processes

doi:10.7523/j.issn.2095-6134.2005.1.019

Abstract

Abstract:

Nitrobenzene , 42nitrophenol , quinoline and reactive brilliant orange K-R were chosen as the model compounds to study the degradation of organic pollutants by homogeneous advanced oxidation process , UV/H₂O₂, and heterogeneous advanced oxidation process , photoelectrocatalytic oxidation. It was found that hydroxyl radical generated by the decomposition of hydrogen peroxide under the UV irradiation was the direct reason that caused organic pollutants to degrade. The degradation of organic pollutants by UVPH-O2 process accorded well with the pseudo-first order kinetics. The effects of pH values , oxidant concentration and anion ions such as HCO^- ₃, NO^- ₃ and Cl ^- have been studied systematically. The degradation pathways of organic pollutants by UV/H₂O₂ were discussed. A newly- designed continuous flow three-dimensional electrode-packed bed photocatalytic reactor was built up to investigate the photoelectrocatalytic degradation performance of organic pollutants. The results showed that application of the three-dimensional electrode could improve the removal efficiencies of photocatalytic process significantly. The applied cell voltage and the presence of NaCl would increase the removal efficiency of organic pollutants dramatically. And the effects of pH values , airflow and oxygen on the photoelectrocatalytic degradation of organic pollutants were also studied.

Key words: organic pollutants, advanced oxidation process, UV/H₂O₂, photoelectrocatalytic, three- dimensional electrode, degradation mechanism

CLC Number:

X524

Zhang Wenbing, Fu Jiamo, Xiao Xianming, Sheng Guoying. Treatment of Organic Pollutants in Aqueous Solution by Homogenous and Heterogeneous Advanced Oxidation Processes[J]. , 2005, 22(1): 122-127.

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