微波辅助离子液体中铜掺杂TiO_2光催化剂的制备及微波强化光催化活性  

Preparation of copper doped TiO_2 photo-catalysts with microwave irradiation in ionic liquid and microwave enhanced photo-catalytic activity

作　　者：王雷清 施忠芬[2] 毕先钧[1] 

机构地区：[1]云南师范大学化学化工学院,云南昆明650500 [2]云南农业职业技术学院畜牧兽医系,云南昆明650031

出　　处：《应用化工》2014年第2期215-221,共7页Applied Chemical Industry

基　　金：国家自然科学基金资助项目(20663007)

摘　　要：在[Bmim]PF6离子液体中,用微波辐射干燥的方法制备了铜掺杂纳米二氧化钛光催化剂TiO2-Cu,测试催化剂对甲基橙溶液的微波(MW)、紫外(UV)、微波-紫外(MW-UV)条件下的降解率,考察了离子液体用量、铜掺杂量、微波干燥功率、微波干燥时间、煅烧温度、煅烧时间、微波降解功率等因素对TiO2-Cu催化剂活性的影响。结果表明,掺杂物质硝酸铜与钛酸丁酯的物质的量比为n(Cu)/n(Ti)=0.025,在功率为210 W的微波条件下干燥20 min,再在高温箱式电阻炉中于500℃下煅烧2 h,所制得的TiO2-Cu催化剂具有较高的光催化活性;在MW、UV和MW-UV 3种降解条件下,对甲基橙的降解率分别为3.78%,92.98%,98.39%;并且在3种降解条件下,甲基橙降解率始终是:MW-UV>UV>MW。表明在紫外光照条件下,微波辅射具有强化TiO2-Cu催化剂降解甲基橙的作用。催化剂结构分析表明,TiO2中掺入铜后制得的催化剂,具有粒径均匀,比表面积、孔容、平均孔径和半孔宽均较大等特点,这也是TiO2-Cu催化剂具有较高的光催化活性的主要原因。Copper doped nano-TiO2 photo-catalysts TiO2-Cu were obtained using titanium tetrabut-oxide as a precursor in [ Bmim ] PF6 ionic liquids which were prepared by microwave irradiation at room temperature. Catalytic degradation reaction could be quantified in terms of methyl orange with microwe irradiation （MW）, ultraviolet lamp light （UV）, and microwave irradiation ultraviolet lamp light （MW-UV）. The results indicated that the optimized conditions of copper doped TiO2 were prepared at a Cu/Ti molar ratio O. 025, [ Bmim] PF6 dosage 5.6 mL,dried in microwave with the power of 210 W for 20 min and calcined at 500 ℃ for 2 h. When the catalyst used to degrade methyl orange, the degradation rate of methyl orange under MW, UV and MW-UV were respectively 3.78% ,92.98% and 98.39%. And more the degradation rate of methyl orange with MW-UV was all along the highest under the three degradation conditions,which indicated the microwave irradiation had the strengthening effect for degradation of methyl orange when TiO2-Cu used as the photo-catalyst. Structure analysis of catalyst showed that TiO2-Cu with higher surface area, almost similar particle size, larger total pore volume, wider average pore size were the main reason for the higher photo-catalytic activity.

关 键 词：微波 离子液体 铜掺杂 二氧化钛光催化剂 微波强化 污水处理 

分 类 号：TQ426.6[化学工程] O643.32[理学—物理化学]