Abstract: A comparative study of visible light photosensitization alone and US/ photosensitization was made to evaluate their respective effectiveness for removal of hard-degraded pollutants from water with 4, 4′- dibrominated biphenyl（4, 4′-DBB）in the experiment, and the degradation degree was estimated by the change of ultraviolet absorption curve. The results indicated that both processes worked well. Especially，a further enhancement of the removal of 4, 4′-DBB was achieved in the process assisted by ultrasound. Six kinds of photo initiators were chosen to treat 4, 4′-DBB solution under visible light. The final removal rate of 2 mg/L 4, 4′-DBB solution reached 22.9% after reacting for 30 min，when Funchsin basic（FB）was chosen as the sensitizer and pH=6. After 28 kHz ultrasound was added，the removal rate of 2 mg/L 4, 4′-DBB solution was enhanced to 25.6%. It was also found that 4, 4′-DBB’s removal by the two methods followed pseudo-first order reaction and the enhancement factor f for 4, 4′-DBB removal rate constant was about 1.12.

摘要： 研究了单独可见光光敏化和US/光敏化处理难降解有机污染物（4,4′-二溴联苯（4,4′-DBB））的效能，并通过紫外吸收光强弱变化判断降解程度。结果表明两种方法都可以达到一定的去除效果，超声的加入使去除率得到进一步提高。选取6种光敏剂单独进行可见光光照对比实验发现，以碱性品红作光敏剂，pH值为6时，对2 mg/L的4,4′-DBB溶液光照30 min后去除率最高达到22.9%。28 kHz低频超声的加入使得去除率进一步提高到25.6%。两种方法去除4,4′-DBB的反应过程符合动力学拟一级反应规律，计算增强因子f为1.12。