Abstract
The use of azo dyes must be controlled and the sewage must be properly treated before being released into the environment. Thus, it is crucial to develop processes that can destroy these azo dyes completely. It has been reported that a methyl orange (MO) aqueous solution can be effectively decolorized in KIO3 homogeneous system under UV light irradiation. In this study, the kinetics and effects of KIO4, H2O2, K2S2O8, and KBrO3 on the decolorization of MO with KIO3 under UV light irradiation were investigated in detail. The results show the decolorization reaction is a zero-order reaction when the concentration of MO is above 25 mg/L. IO4-, S2O82-, BrO3-, and H2O2 can greatly inhibit the photocatalytic decolorization reaction of MO. Several observations indicate the photocatalytic decolorization of MO with KIO3 under UV irradiation occurs by ⋅O2- attack only. A more detailed mechanism of KIO3 photocatalysis will be further investigated in the near future.
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