离子液体中微波辅助制备氮掺杂tio2催化剂 - 分子催化.doc

离子液体介质中微波辅助制备铁掺杂纳米TiO2及光催化活性 张桂琴1，2， 毕先钧1，* （云南师范大学化学化工学院云南昆明650092云南昆明6500）摘要: 在1-丁基-3-甲基咪唑六氟磷酸盐（[Bmim]PF6）离子液体中，用微波干燥的方法制备了掺杂的纳米TiO2-Fe光催化剂，并以甲基橙为模拟污染物，紫外灯为光源，考察了离子液体加入量、掺杂量、微波干燥功率、微波干燥时间、煅烧温度、煅烧时间等因素对TiO2-Fe 光催化活性的影响。结果表明：在离子液体加入量为5.6 ml，掺杂物质硝酸与钛酸丁酯的物质的量百分比为0.005%，于家用微波炉中在210W功率下干燥17.5min，再在高温箱式电阻炉中于540 ℃煅烧处理1.5 h后所制得的TiO2-Fe光催化剂，紫外光照90 min太阳光照射 h后，甲基橙几乎完全降解，其活性于未掺杂纯TiO2 的光催化活性。关键词：离子液体；微波；掺杂；TiO2；光催化降解 Microwave assisted preparation of Fe-doped nano-particle TiO2 in ionic liquid and Its photo-catalytic Activity Zhang Gui-qin1，2， BI Xian-jun1，* （1. Institute of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming Yunnan 650092，P. R . China； 2. Department of Husbandry and Veterinary，Yunnan agriculture vocational and technical college，Kunming Yunnan 650031，P. R . China）Abstract: Fe-doped nano-TiO2 photo-catalysts were obtained by microwave drying in ionic liquids. With Methyl Orange as degradation agent and ultraviolet lamp as light source, the influence of the volume of the ionic liquid，Fe/Ti mole ratio，microwave drying power and time，calcined temperature and time on the photo-catalytic activities of Fe-doped nano-TiO2 were investigated. The results indicated that the Fe-doped nano-TiO2 catalysts showed higher photo-catalytic activity than that of pure while the Fe/Ti mole ratio was 0.005% and the Fe-doped nano-TiO2 was dried in microwave with the power of 210 W for 17.5 min and calcined at 540 ℃ for 1.5 h. The methyl orange had almost been entirely degraded by UV light lighting 90 min or by sun light lighting 3h when the TiO2-Fe was used as photo-catalysts. Keywords: Ionic liquid；Microwave；Fe -doping；Titanium dioxide；Photo-catalytic degradation近年来，通过光催化降解处理水和空气污染的新技术逐渐为人们所关注。在众多用于光催化技术的催化剂中，由于TiO2具有氧化能力强、无选择性、能耗低和降解完全等优点，且价廉、无毒、无二次污染，可长期使用，因而备受关注。但TiO2的电子和空穴容易发生复合，光催化效率低，带隙较宽(约3.2 eV) ，只能在紫外区显示光化学活性，对太阳能的利用率 %左右。因此如何提高其光催化活性是制约TiO2光催化技术实用的关键[1，2]。不少研究者发现，采用金属离子掺杂的方法能够提高光催化剂的催化活性，但也有不少得出相反的结论[3]。关于金属离子掺杂对TiO2光催化活性影响报道中，尤其以Fe3+掺杂的研究居多[4]。如周林等[]分别