摘要
研究了负载于玻璃上的固定化催化剂TiO2膜光催化降解水中4,4’-二溴联苯(4,4-’DBB)的效果,考察了溶液pH值和4,4’-DBB初始浓度等对TiO2膜光催化降解4,4’-DBB的影响,探讨了降解机理。结果表明,TiO2膜光催化降解水中4,4’-DBB的效果良好,紫外光照射8 h,初始浓度为4 mg/L的4,4’-DBB的降解率高达94%,降解速率随着4,4’-DBB初始浓度的增大而下降。在溶液pH=1时,4,4’-DBB的降解效率最高。超声的加入使降解反应的速率加快。经拟合发现4,4’-DBB的降解符合拟一级反应规律,并推导出动力学方程。
The efficiency of photodegradation of 4, 4 ＇ -DBB in water by fixed photocatalyst TiO2 thin film loaded on glass was studied. The influence of solution pH value and initial 4, 4＇ -DBB concentration on photodegradation of 4, 4＇ -DBB was investigated and the mechanism of photodegradation of 4, 4＇ -DBB was discussed. The result showed that the efficiency of photodegradation of 4, 4＇ -DBB in water by TiO2 thin film was good. The degradation rate of 4, 4＇-DBB （4 mg/L ）was up to 94% after eight hours ultraviolet irradiation. The degradation rate decreased with the increase of initial 4, 4＇ -DBB concentration under the same conditions. The degradation efficiency was highest at pH 1 of solution. Ultrasound technology can accelerate the rate of degradation. It was also found that 4, 4＇ -DBB degradation followed pseudo-first order reaction and the kinetic reaction equation was fitted.
出处
《环境工程学报》
CAS
CSCD
北大核心
2009年第1期72-76,共5页
Chinese Journal of Environmental Engineering
基金
江苏省"青蓝工程"资助项目(2006)
关键词
4
4’-二溴联苯
TIO2薄膜
光催化
超声
4, 4＇ -dibrominated biphenyl
TiO2 thin film
photodegradation
ultrasound
