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。
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 factorffor 4, 4＇-DBB removal rate constant was about 1.12.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2007年第10期1484-1488,共5页
Chemical Industry and Engineering Progress
关键词
溴联苯
可见光
光敏化
超声
brominated biphenyl
visible light
photosensitization
ultrasound
