MWNTs/TiO_2对1,2,3-三氯苯的吸附与光降解协同作用研究

Study of 1,2,3-Trichlorobenzene Removed by Adsorption and Photocatalytic Degradation Synergistic Reaction of MWNTs/TiO_2

以典型氯苯类有机化合物1,2,3-三氯苯(1,2,3-TCB)为目标去除物,研究复合光催化剂MWNTs/TiO2(多壁碳纳米管负载二氧化钛)对其吸附与光催化降解协同作用.结果表明,在不同温度、pH值、复合光催化剂投加量、紫外光光强等影响因素作用条件下,MWNTs对1,2,3-TCB的吸附去除率与纳米TiO2对1,2,3-TCB的光催化降解去除率的叠加理论计算值曲线均在MWNTs/TiO2对1,2,3-TCB吸附与光催化降解共同作用曲线的下方,充分体现了MWNTs/TiO2对1,2,3-TCB的吸附与光降解初始阶段的协同作用.溶液中温度或pH值降低,有利于复合光催化剂对1,2,3-TCB的去除;复合光催化剂投加量增多或紫外光光强增大将提高复合光催化剂对1,2,3-TCB的去除率.

Using typical chlorobenzenes 1,2,3-trichlorobenzene （1,2,3-TCB） as the target removal, experiments were done for the adsorption and photocatalytic degradation synergistic reaction of Multi- walled Carbon Nanotubes of TiO2 （MWNTs/TiO2）. The results showed a calculated curve that superimposed in the removal rate of 1,2,3-TCB adsorbed on MWNTs and the degradation rate of the nano-TiO2 for 1,2,3-TCB was always below the curve of 1,2,3-TCB removal rate through the adsorption and photocatalytic degradation synergistic reaction of MWNTs/TiO2 in conditions of different solution temperatures, pH, dosages of MWNTs/TiO2, and the intensity of UV light, which has fully reflected that MWNTs/ TiO2 has adsorption and photodegradation synergistic reaction. The solution temperature or pH values decrease will help MWNTs/TiO2 to remove 1, 2,3-TCB, increase the dosage of MWNTs/TiO2, or the intensity of UV light will help MWNTs/TiO2 to remove 1,2,3 - TCB.