An experiment demonstrated that the dye of Congo Red (CR) in water could be photocatalytic degraded effectively in the presence of potassium bromate (KBrO 3) under simulated sunlight irradiation. The degradation efficiency of CR increased as the dosage of KBrO 3 increased, while decreased as the CR initial concentration increased. When the dosage of KBrO 3 was 1.5 g·L-1, the degradation of CR was up to 100%in 30 min. This paper revealed that the degradation reaction followed pseudo first-order kinetics. The apparent activation energy (Ea) for 40 mg·L-1 CR between 298 K and 328 K was 8.073 kJ·mol-1. The lower Ea indicated that the breakdown of the chemical bonds of CR in photodegradation reaction required less energy. By examining the effect of isopropanol (IPA), ethanol (EA) and methanol (MT) as the scavenger of hydroxyl radicals, it was shown that hydroxyl radicals played a main role in photodegradation of CR with KBrO 3.%本文研究表明溴酸钾（KBrO3）可光催化降解刚果红，刚果红的降解效率随溴酸钾用量的增加而增加，随刚果红初始浓度的增加而降低。较低的活化能表明较少的能量即可使刚果红的化学键断裂。捕获剂实验结果表明羟基自由基在刚果红的光催化降解反应中起主要作用。
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