负载型TiO_2光催化氧化法处理硝基苯酚工业废水

Treatment of nitrophenol wastewater by heterogeneous photocatalytic oxidation process

以活性炭负载TiO2为催化剂对含硝基苯酚废水进行光催化氧化实验,研究了催化剂的投加量、pH、光照时间、光强以及起始浓度对光解作用的影响。结果表明:活性炭负载TiO2溶胶型催化剂具有较高的光催化活性。当采用300W高压汞灯、催化剂质量分数为0.3%、pH为3.8、光解180min时,废水中COD和硝基苯酚的去除率均达到95%以上。制得的负载型TiO2具有较高的机械强度和化学稳定性,可重复使用。

The Photocatalytic oxidation of the nitrophenol wastewater has been carried out by using TiO 2 -coated activated carbon.The effects of some factors,such as dosage of catalyst,pH values,illumination time and light intensity,on the removal efficiency are discussed.The experimental results show that TiO 2 film immobilized on active carbon has an efficient catalytic activity.The removal rates of the COD and nitrophenol are more than95%,under the conditions of pH=3.8,0.3%catalyst,300Wof UV lamp and180min of illumination time.Moreover,the coated TiO 2 catalytic material is very stable mechanically and chemically,and can be re-used.