流化光催化反应器降解水中有机污染物

Degradation of Organic Pollutants Using Fluidizing Photocatalytic Reactor

采用溶胶—凝胶结合CO2超临界干燥方法与浸渍法制得了颗粒型与薄膜型TiO2光催化剂,选择苯酚和苯胺为炼厂废水难降解污染物的模型物,通过流化光催化反应器与固定式光催化反应器考察了反应条件对苯酚、苯胺降解的影响.实验结果表明,溶胶-凝胶结合CO2超临界干燥方法有利于制得大比表面、大孔容、高活性TiO2催化剂,流化光催化反应器对苯酚、苯胺的降解效果要优于浆式反应器与固定式反应器,光催化方法适宜于对低浓度污染物废水的深度处理,优化反应条件有利于提高光催化效率.

Particle and thinfilm TiO2 catalysts were prepared by the solgel and CO2 supercritical fluid drying method and immersion method. Phenol and benzeneamine were selected as the model pollutants in wastewater from oil refiner. These pollutants were unbiodegradable. The effects of photocatalytic reaction conditions on the degradation of phenol and benzeneamine were examined through fluidizing or fixed photocatalytic reactor. Based on experimental results, it can be found that high activity TiO2 catalysts, with large surface area and pore volume, can be prepared by solgel and CO2 supercritical fluid drying method. The developed fluidized reactor is better than fixed and stirred reactor in degradation of phenol and benzeneamine. Photocatalytic method is suitable for treating the wastewater containing low concentration pollutants. The efficiency of phtocatalytic degradation can be improved by optimizing the reaction conditions.