负载型TiO_2/MCM-41催化剂在光催化-膜分离耦合工艺中的性能

Performance of load type TiO_2/MCM-41 catalyst in coupling process of photocatalytic-membrane separation

采用溶胶4疑胶法制备了以介孔MCM41分子筛为载体的TiO_2/MCM41催化剂,并通过光催化降解酸性红B废水对其在光催化4莫分离耦合工艺中的光催化降解性能和膜污染影响进行了研究。结果表明:TiO2/MCM^l催化剂的废水降解率随TiO_2负载量増加、MCM41分子筛粒径减小和TiO_2/MCM41催化剂粒径减小而呈现出先増大后降低的趋势而膜通量衰减率在TiO_2负载量为80%时最低、同时呈现出随MCM41分子筛粒径减小而先降低后増大以及随TiO_2/MCM41催化剂粒径减小而不断増大的变化规律,适宜的MCM41分子筛粒径、TiO_2/MCM41催化剂的TiO_2负载量和TiO_2/MCM41催化剂粒径分别为0.61μm、30%和11.26 TiO_2/MCM-41催化剂的光催化降解性能优于商业TiO_2的,而膜污染则低于商业TiO_2的。

TiO2/MCM-41 catalyst,whose carrier is mesoporous molecular sieve MCM-41,was made by sol-gel.The photocatalytic degradation performance and the membrane fouling effect of TiO2 /MCM-41 catalyst in the coupling process of photocatalytic-roembrane separation were studied through the degradation of acid red B wastewater.The results showed that wastewater degradation rate of TiO2/MCM-41 initially increased,then decreased with the increasing load of TiO2 and the decreasing size of MCM-41 and TiO2/MCM-41.However,the membrane flux declining rate was the lowest at a TiO2 load of 80%.Overall,it initially decreased,then increased with the decrease in the size of MCM-41,and continued to increase with the decrease in the size of TiO2/MCM-41.The appropriate size of MCM-41,TiO2/MCM-41 and the TiO2 load were 0.61 μm 30% and 11.26 μm respectively.The photocatalytic degradation performance of TiO2/MCM-41 was better than commercial TiO2,while its membrane fouling was lower than commercial TiO2