TiO_(2)/ACF与TiO_(2)/Bi_(2)WO_(6)/ACF材料吸附光催化降解VOCs条件优化及性能评价

Optimization and Performance Evaluation of Photocatalytic Degradation of VOCs by TiO_(2)/ACF and TiO_(2)/Bi_(2)WO_(6)/ACF Materials

通过开展TiO_(2)/ACF与TiO_(2)/Bi_(2)WO_(6)/ACF材料吸附光催化降解VOCs废气的室内模拟实验,探究反应环境(流量、初始浓度、温度、湿度)对吸附光催化降解效率的影响。结果表明:TiO_(2)/ACF材料的最优降解条件为浓度1000 mg/m^(3),流量1.2 m^(3)/h,湿度30%,温度33℃;TiO_(2)/Bi_(2)WO_(6)/ACF材料的最优降解条件为浓度1000 mg/m^(3),流量1.2 m^(3)/h,湿度33%,温度34℃;两种材料在最优条件下均具有对高浓度污染物响应速度快、反应平衡后污染物转化率高的特点,TiO_(2)/ACF材料三级反应总体转化率达到81.71%,TiO_(2)/Bi_(2)WO_(6)/ACF材料三级反应总体转化率达到85.96%。因此,将吸附光催化技术与其他处理技术相结合作为一种预处理方法,针对储罐呼吸气排放源,在实现VOCs初步降解的同时还可以稳定平衡VOCs浓度,具有较好的缓冲、减排效果,该技术工艺流程简单,能耗低,具有很好的应用前景。

The adsorption photocatalytic degradation experiments of TiO_(2)/ACF and TiO_(2)/Bi_(2)WO_(6)/ACF materials simulating VOCs exhaust gas in laboratory were conducted to investigate the influence of reaction environment(flow rate,initial concentration,temperature,relative humidity)on the adsorption photocatalytic degradation efficiency.As the experimental results shown,the optimal degradation conditions of TiO_(2)/Bi_(2)WO_(6)/ACF materials are as follows:concentration of 1000 mg/m^(3),flow rate of 1.2 m^(3)/h,humidity of 30%and temperature of 33℃.The optimal degradation conditions of TiO_(2)/Bi_(2)WO_(6)/ACF materials are as follows:concentration of 1000 mg/m^(3),flow rate of 1.2 m^(3)/h,humidity of 33%and temperature of 34℃.These two materials shown the characteristics of fast response to high concentration of pollutants and high conversion rate of pollutants after balanced reaction.The comprehensive conversion rate of TiO_(2)/ACF and TiO_(2)/Bi_(2)WO_(6)/ACF can reach 81.71%and 85.96%,respectively.Therefore,the combination of adsorption photocatalysis technology and other treatment methods as a pretreatment facility shown good buffer and emission reduction effect on the degradation and concentration balance of VOCs for the storage tank respiratory gas emission source.Meanwhile,due to the simple process and low energy consumption,this composite technology shown good application prospect.