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Abstract The ultra-degradation of sulfadiazine (Sulfadiazine, SD) enhanced by molecular iodine under ultrasound/ H2O2/KI system was investigated. The experimental parameters such as initial solution pH, KI and H2O2 adding concentration were discussed. The main active species in ultrasound/H2O2/KI system were evaluated by adding methimazole, the scavenger of iodine radicals. The experimental results indicated that SD degradation was enhanced significantly under the ultrasound/H2O2/KI system. The SD removal efficiency decreased with the initial pH value, and was influenced considerably by the concentration of H2O2 and KI. The radical inhibition experiments indicated that I· and I2-· were the main active species contributed to SD degradation. HPLC analysis showed that four intermediate products formed during SD degradation under ultrasound/H2O2/KI system, and one was sulfanilamide.
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Received: 26 April 2015
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