微波助离子液体中纳米TiO_2/PMMA复合材料的制备及光催化性能

Microwave Assisted Preparation of Nano-sized TiO_2/PMMA Composite Material in Ionic Liquid and Its Photo-catalytic Capability

微波加热法合成离子液体[Bmim]BF4,并以该离子液体为反应介质,在微波辐射条件下制备纳米TiO2/PMMA复合材料.用XRD,IR和TG对该复合材料进行测试和表征;并在高压汞灯下用甲基橙溶液对其进行光催化降解性能测试.结果表明,制备TiO2/PMMA复合材料的最佳条件是:离子液体1.7mL,钛酸丁酯与MMA的体积比为3.4∶1.0,微波辐射功率600W、反应温度70℃、反应时间35min.并且用[Bmim]BF4作为反应介质,能够显著提高TiO2/PMMA复合材料的光催化活性,所制备的TiO2/PMMA复合材料不需要经过高温煅烧,就表现出极高的光催化活性;TiO2负载PMMA后,复合材料的光催化活性得到了进一步的改善.该复合材料对甲基橙的降解率在1.5h就可达到98.4%,其活性明显优于未负载的纳米TiO2催化剂.

Ionic liquid [ Bmim] BFahad been prepared by microwave irradiation. With the [ Bmim] BF4 as reactive medium, TiO2/PMMA composite materials were prepared by microwave irradiating. XRD, IR and TG were employed to characterize the composite material. With methyl orange as degradation agent and ultraviolet lamp as light source, the photo-catalytic capability of TiO2/PMMA was tested. The results indicated that the best condition of preparing TiO2/PMMA is 1.7 mL [ Bmim] BF4, volume ratio of Ti-OC4H9 with MMA 3.4： 1.0,microwave power 600 W, reactive temperature 70℃ and reactive time 35 min and the photo-catalytic degradation ratio of TiO2/PM-MA on methyl orange could reach 98.4% in 1.5 h at the conditions. And more the composite material showed higher photo-catalytic activity than that of pure TiO2.