Decolorisation of Methyl Orange solution with KIO3 under UV irradiation

This report has shown that the dye of Methyl Orange (MO) in water can be decolorized effectively in the presence of KIO3 under UV irradiation. Decolorisation efficiency of MO increases as the loading of KIO3 increases and has no an optimal amount of KIO3 in this case. The kinetic result shows that the decolorisation reaction is a pseudo first-order reaction when the concentration of MO is below 10 mgL(-1). The influences of the pH value and hydroxyl radical scavengers on the decolorisation reaction were investigated in detailed. Several observations indicate that the mechanism is not the attack of hydroxyl radicals in MO decolorisation with KIO3 under UV irradiation. More considerations should be focused on the underlying possible decolorisation mechanism of MO with KIO3 under UV irradiation.