Microwave assisted photocatalytic degradation of cyromazine in aqueous solutions
Photocatalytic degradation of cyromazine in TiO2 aqueous suspensions assisted with microwave was investigated with a microwave apparatus. The enhancement of the degradation by electrodeless discharge lamp (EDL) was examined. Results showed that the degradation efficiency of cyromazine in 1.0 g/L T1O2 suspension reached 99.6% after 20 min reaction by the microwave assisted photocatalysis. The primary degradation product melamine was detected. The degradation efficiencies of cyromazine were all over 99% in the pH range from 3.0 to 9.0 and increased with the increasing dosage of TiO2 and the number of EDL. Addition of nitrate ions considerably inhibited the degradation of cyromazine, which was mainly caused by the high UV absorption of nitrate at the short wavelength and the adsorption of nitrate in positive holes on TiO2 surface.
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