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环境工程学报 2012
Degradation of algal toxin MCLR by photoelectrocatalytic oxidation
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Abstract:
The degradation of algal toxin microcystin-LR (MCLR) by photoelectrocatalytic oxidation and the influencing factors were studied. The results showed that TiO2 on the electrode surface present obvious photocatalytic effects in photocatalytic oxidation. Photoelectrocatalytic oxidation was the most effective process among photodegradation, photocataytic oxidation, electrocatalytic oxidation and photoelectrocatalytic oxidation in degrading MCLR and TOC, which achieved the removal efficiency of 100% and 13%, respectively. The degradation efficiency of photoelectrocatalytic oxidation was higher than that of the sum of photocatalytic oxidation and electrocatalytic oxidation, showing a certain synergetic effect. The best synergetic effect was obtained under optimum match condition of irradiation source and current density,which were irradiation UVC,current density of 10 mA/cm2 and irradiation UVA,current density of 1.0 mA/cm2.The removal efficiency in photoelectrocatalytic oxidation decreased along with the increase of the plate distance, which was correlative with electrocatalytic process rather than photocatalytic process. The MCLR removal efficiency decreased with the increase of its initial concentration in photoelectrocatalytic oxidation.
