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。
Abstract:
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 pseudofirst order reaction and the kinetic reaction equation was fitted.
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