TiO_2纳米管催化降解4,4’-二溴联苯的影响因素和动力学研究

Studies on influencing factors and kinetics of photocatalytic degradation of 4,4'-DBB of TiO_2 nanotubular

利用TiO2纳米管催化降解水中的4,4’-二溴联苯,对催化降解过程和影响因素进行研究。结果表明,TiO2纳米管对其有较高的催化降解效率且降解过程符合Langmuir-Hinshelwood动力学模式。不同光源、4,4’-二溴联苯的初始浓度、纳米管添加量和pH值对催化降解过程都有较大影响,其中pH值的影响最为明显。反应液在中性状态下的降解率明显低于pH=1或11的情况。在pH=1时,4,4’-二溴联苯的降解率达86%。

The efficiency and influencing factors of the photocatalytic degradation of 4, 4＇-DBB in water were studied using TiO2 nanotubular as photocatalyst under UV irradiation. The results show that the photocatalytic degradation of 4, 4＇-DBB in water by TiO2 nanotubular is efficient. The degradation of 4, 4＇-DBB follows the Langmuir-Hinshelwood kinetics reaction. The experiments show that several parameters have great impacts on the photocatalytic degradation process such as light source, 4, 4＇-DBB initial concentration, nanotubular amount,pH value and so on. And pH plays an important role in the degradation process. Higher degradation rates are reached in pH = 1 or pH = ll solution and lower in neutral solution. The degradation rate of 4, 4＇ -DBB is 86% at pH = 1.