以钛酸情丁酯(TEOS)、去离子水为原料,离子液体l-丁基-3-甲基四氟硼酸咪唑盐([Bmim] BF4)为表面活性剂,通过溶剂热法制备了锐钛矿相TiO2纳米颗粒.用X-射线衍射仪(XRD)、扫描电镜(SEM)、紫外一可见吸收光谱仪(UV-Vis)对产物的晶相、形貌和光学性能进行表征.为了评估光催化活性,并以甲基橙水溶液为研究对象,在紫外光照射下分析不同照射时间下光降解效率.结果表明,离子液体、去离子水和钛酸四丁酯的体积比为1.3∶1∶1.3时,反应所得到的TiO2具有较高光催化活性,明显优于未添加离子液体的产品,这一结果可归因于其具有较大的比表面积.%Nanocrystalline TiO2 was synthesized with ionic liquid [Bmim] [ BF4 ] as surfactant, TEOS as starting material in ethanol solution by solvothermal method at 180℃for 24 h. The structure, morphology and optical property of the obtained samples were characterized with X-ray diffraction, SEM and UV-Vis spectroscopy. As-synthesized TiO2 products with sizes of 20 ~ 30 nm show spherical motif and anatase crystalline phase. Un-vis absorption illustrates that TiO2 samples have a relative strange absorpion peak at 340 nm and blue-shift with decreasing sizes of samples. For the sake of evaluation of photcatalytic activity of our samples, the photocatalytic degradation of methyl orange were conducted using UV lamb as light source in water. The product prepared in the mixted solution of 1 mL ionic liquid and 0. 75 mL water at 180℃for 24 h showed better photocatalytic activity with photodecomposion up to 98% under UV irradiation for 70 min in comparison with commercial TiO2. The higher photocatalytic activity was attributed to the large surface area of the catalyst.
展开▼
