TiO2/MIL-53(Al)和TiO2/Al2O3催化剂的制备及其光催化性能研究

采用溶剂热法合成了MIL-53(Al),以此为载体负载TiO_2制备得到TiO_2/MIL-53(Al)光催化剂用于污水中次甲基蓝的催化降解研究,并与传统载体材料Al_2O_3负载的TiO_2催化剂的光催化效果进行比较。样品通过热重-差热扫描量热(TG-DSC)、红外光谱(FTIR)、扫描电镜(SEM)、X射线衍射(XRD)、N_2物理吸附-脱附等方法进行表征。采用光度吸收法分析污水中次甲基蓝的降解率,结果显示,TiO_2/MIL-53(Al)光催化剂对次甲基蓝的光催化降解率达到98.6%,而TiO_2/Al_2O_3光催化剂对次甲基蓝的降解率只有70.3%,TiO_2/MIL-53(Al)光催化剂对污水中次甲基蓝的降解去除能力明显优于TiO_2/Al_2O_3光催化剂对次甲基蓝的降解去除能力。

Preparation of TiO2/MIL-53(Al) and TiO2/Al2O3 catalysts and their photocatalytic performance

MIL-53 (Al) was synthesized by solvothermal method, and TiO2/MIL-53 (Al) photocatalyst was prepared by using TiO2 as the carrier for the catalytic degradation of methine blue in sewage. The photocatalytic performance of the TiO2/MIL-53(Al) and the TiO2/Al2O3 was compared. The catalysts were characterized by thermogravimetric-differential scanning calorimeter (TG-DSC), Fourier transform infrared(FTIR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and N2 adsorption-desorption. The photodegradation efficiency of submethyl blue was analyzed by photometric absorption method. The results showed that the degradation rate of methylene was more than 98.6% on TiO2/MIL-53(Al) photocatalyst, but that of methylene was only 70.3% on TiO2/Al2O3 photocatalyst. Therefore, the photocatalytic activity of TiO2/MIL-53(Al) photocatalyst exhibited much higher than that of the TiO2/Al2O3 photocatalyst in degradating methyl blue.