TiO_2/AC光催化剂上气体污染物降解的反应动力学模型

Reaction Kinetic Model of Gaseous Pollutant Degradation over TiO_2/AC Photocatalyst

利用二氧化钛与活性炭(AC)共水热处理的方法制备了TiO2/AC复合催化剂,采用空气净化评价装置对其催化降解低浓度气体污染物丁醛的性能进行了模拟评价实验.基于Langmuir-Hindshelwood方程和一些假设,推导了循环反应系统气体污染物降解的瞬态模型.结果表明,该动力学模型所得数据与丁醛的模拟评价实验结果基本相符,预示着该模型能够很好地预测污染物的降解行为.

Titanium dioxide/activated carbon composite photocatalysts were prepared through hydrothermal treatment of titanium dioxide and activated carbon. In a recirculating photocatalytic reactor, the degradation of low concentration butyraldehyde, a gaseous pollutant, over the catalyst was performed. Based on the Langmuir Hindshelwood equation and some hypotheses, a transient model for the degradation of the butyraldehyde in the recirculating reaction system was proposed. The results obtained from the kinetic model were approximately consistent with the experimental data. This indicated that the photodegradation behavior of gaseous pollutants could be well predicted using the kinetic model.