标题:
微波助离子液体中S掺杂TiO2催化剂的制备及其微波强化光催化活性Microwave Assisted Preparation of S-Doped Nano-TiO2 Photo-Catalysts in Ionic Liquids and Its Microwave Enhanced Photo-Catalytic Activity
作者:
蒋文建, 孙婧, 毕先钧
关键字:
离子液体, 纳米TiO2, 光催化降解, 微波强化, S掺杂Ionic Liquid; Nanoparticle TiO2; Photocatalytic Degradation; Intensified by Microwave; S-Doping
期刊名称:
《Hans Journal of Chemical Engineering and Technology》, Vol.3 No.4, 2013-07-11
摘要:
在离子液体介质中，采用溶胶–凝胶法，以钛酸正丁酯为前驱物，合成S掺杂纳米TiO2光催化剂TiO2-S。采用IR、XRD对催化剂的结构进行了表征，以甲基橙为模拟污染物，在微波超声波组合催化合成仪中，在恒温(25℃)下，分别利用微波辐射(MW)、紫外光照(UV)及微波辐射 + 紫外光照(MW/UV)三种降解条件，考察了煅烧温度、煅烧时间、微波干燥功率、微波干燥时间、离子液体用量和S掺杂量对其光催化活性的影响。试验表明，煅烧温度为600℃、煅烧时间为2 h、微波干燥功率为210 W、微波干燥时间为25 min、离子液体加入量为5.6 mL和S掺杂量为n(S)/n(Ti) = 2时，TiO2-S的催化活性最高，且在MW、UV和MW/UV三种降解条件下，TiO2-S对甲基橙的降解率分别为7.26%，75.49%，82.12%，这表明微波与紫外光照有很好的协同作用，微波–紫外光照具有强化S掺杂纳米TiO2降解甲基橙的效果。
Using Ti(OBu)4 as the precusor S-doped nano-TiO2 photo-catalysts were prepared by the sol-gel method in ionic liquids. The IR and XRD were used to characterize the structure of the catalysts. At a constant temperature (25°C), using respectively the three degradation conditions of MW, UV and MW/UV, the effects of the calcinations temperature, the calcinations time, the power of microwave drying, microwave drying time, the amount of ionic liquid and the S doping amount on the photocatalytic activity of nanoparticle TiO2 for degradation of methyl orange were investigated in the combination of catalytic synthesis of microwave ultrasonic instrument. The tests indicated that the highest catalytic activity of nanoparticle TiO2 under the following condition: calcination temperature of 600°C, calcination time of 2 h, microwave drying power of 210 W, microwave drying time of 25 min, ionic liquid added in an amount of 5.6 mL and S doped amount of n(S)/n(Ti) = 2. The degradation rate of methyl orange under three conditions of MW, UV and MW/UV were 7.26%, 75.49% and 82.12% respectively. This reveals that MW has a very good synergy with UV, and microwave has the effect of strengthening S-doped nano-TiO2 degradation of methyl orange.