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Mechanism of enhanced removal of quinonic intermediates during electrochemical oxidation of orange Ⅱ under ultraviolet irradiation

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Journal of Environmental Sciences 2014年第3期26卷 708-715页

作者： Fazhan Li Guoting Li Xiwang Zhang Institute of Environmental and Municipal Engineering North China University of Water Resources and Electric Power Department of Chemical Engineering Monash University

The effect of ultraviolet irradiation on generation of radicals and formation of intermediates was investigated in electrochemical oxidation of the azo-dye orange I1 using a TiO2-modified β- pbo2 electrode. It was found that a characteristic absorbance of quinonic compounds at 255 nm, which is responsible for the rate-determining step during aromatics degradation, was formed only in electrocatalytic oxidation. The dye can be oxidized by either HO radicals or direct electron transfer. Quinonic compounds were produced concurrently. The removal of TOC by photo-assisted electrocatalytic oxidation was 1.56 times that of the sum of the other two processes, indicating a significant synergetic effect. In addition, once the ultraviolet irradiation was introduced into the process of electrocatalytic oxidation, the degradation rate of quinonic compounds was enhanced by as much as a factor of two. The more efficient generation of HO radicals resulted from the introduction of ultraviolet irradiation in electrocatalytic oxidation led to the significant synergetic effect as well as the inhibiting effect on the accumulation of quinonic compounds.

关键词： electrocatalysis photocatalysis β-pbo2 electrode ultraviolet orange ii

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