Formation of bromate in aqueous solution in the presence of Br- under ultrasonic irradiation
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Abstract:
Formation of bromate(BrO3-) in aqueous solution in the presence of Br- under ultrasonic irradiation was investigated. The results show that BrO3- formed by a series of reactions between hydroxyl free radical (·OH) generated by ultrasonic cavitation and Br-. The total BrO3- yield increases with the increase of the initial concentration of Br-. While the yield ratio of BrO3- to Br- decreases with the increased initial concentration of Br-. The yield of BrO3- at different frequencies follows the order 400 > 600 > 800 > 200 kHz. When the ultrasonic energy density increases from 0.06 W/mL to 0.19 W/mL, the formation rate of BrO3- increases first and then decreases. BrO3- formation rate decreases with the increase of pH.
