微波助离子液体中锌和氮共掺杂TiO_2催化剂的制备及微波强化光催化活性  

Preparation of Zn and N Co-doped TiO_2 Photo-Catalyst with Microwave Irradiation in Ionic Liquid and Microwave Strengthen Photo-Catalytic Activity

作　　者：孙婧[1] 蒋文建[1] 张桂琴[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：《分子催化》2013年第6期566-574,共9页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金资助项目(20663007)

摘　　要：在1-丁基-3-甲基咪唑六氟磷酸盐([Bmim]PF6)离子液体介质中,采用微波干燥的方法制备了锌和氮共掺杂的TiO2催化剂TiO2-Zn-N,分别采用IR、XRD、SEM、BET对催化剂结构进行了测试和表征.室温条件下,以甲基橙和苯酚溶液为模拟污染物,在微波超声波组合催化合成仪中,分别利用微波辐射(MW)、紫外光照(UV)、微波辐射-紫外光照(MW-UV)和太阳光照射(SL)等降解方式,着重考察了制备条件对TiO2-Zn-N光催化活性的影响.结果表明,在离子液体用量为5.6 mL、Zn掺杂量n(Zn)/n(Ti)=0.015∶1、N掺杂量n(N)/n(Ti)=4∶1、微波干燥功率350 W、微波干燥时间20 min、煅烧温度700℃、煅烧时间2 h的条件下所制得的TiO2-Zn-N催化剂具有较高的光催化活性;在MW、UV、MW-UV和SL 4种降解条件下,TiO2-Zn-N对甲基橙的降解率分别为29.6%、95.4%、99.2%和79.2%;并且在前3种降解条件下,甲基橙降解率始终是:MW-UV>UV>MW.这表明在紫外光照条件下,微波辅射具有强化催化剂降解甲基橙的作用.Zn and N co-doped TiO2 photo-catalysts were prepared by microwave drying method in ionic liquid 1-bu- tyl-3 methylimidazolium hexafluorophosphate. The IR, XRD, BET and SEM were used to characterize the structure of the catalysts. At a constant temperature （25 ℃ ）, microwave irradiation （ MW）, ultraviolet lamp light （ UV）, microwave irradiation-ultraviolet lamp light （MW-UV） and sun light （SL） used respectively for degradation of methyl orange and phenol, the influences of the preparing condition on the photo-catalytic activity of TiO2-Zn-N catalyst were investigated by the combination of catalytic synthesis of microwave ultrasonic instrument. The results indicated that the best preparing condition of TiO2-Zn-N catalyst which exhibited higher photo-catalytic activity was orange, the and 79.2% under MW, degradation rate of methyl orange under MW, UV, MW-UV and SL were 29.6%, 95.4% , 99.2% degradation of methyl orange when TiO2-Zn-N used as the photo-catalyst

关 键 词：催化化学 离子液体 微波 锌-氮共掺杂二氧化钛 光催化降解 

分 类 号：O643.32[理学—物理化学]