微波助离子液体中硫-钕共掺杂TiO_2催化剂的制备及其微波强化光催化活性  

Microwave assisted preparation of S and Nd codope nano-TiO_2 photocatalysts in ionic liquids and microwave strengthening photocatalytic activity

作　　者：蒋文建[1] 孙婧[1] 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

出　　处：《工业催化》2013年第9期32-37,共6页Industrial Catalysis

基　　金：国家自然科学基金(20663007)资助项目

摘　　要：在离子液体介质中,采用溶胶-凝胶法,以钛酸四丁酯为前驱物,用微波干燥法合成S和Nd共掺杂纳米TiO2光催化剂TiO2-S-Nd。分别采用IR、XRD、BET和SEM对催化剂结构进行测试与表征,以甲基橙为模拟污染物,在微波超声波组合催化合成仪中,恒温(25℃)下分别利用微波辐射、紫外光照及微波辐射+紫外光照3种降解条件,着重考察Nd掺杂量和S掺杂量对TiO2-S-Nd光催化活性的影响。结果表明,在离子液体用量5.6 mL、n(Nd)∶n(Ti)=0.015和n(S)∶n(Ti)=2时,经功率为350 W的微波加热干燥处理20 min的半成品催化剂,再在700℃高温炉焙烧2 h,制得TiO2-S-Nd催化剂,具有较高的光催化降解活性。且在3种降解条件下,TiO2-S-Nd对甲基橙降解率分别为12.11%、88.91%和100%,表明微波与紫外光照有较好的协同作用,即微波-紫外光照具有强化S和Nd共掺杂TiO2-S-Nd催化剂降解甲基橙的效果,并且所制得的共掺杂TiO2-S-Nd催化剂的光催化活性均高于单一S或Nd掺杂TiO2的光催化活性,说明S和Nd共掺杂也具有协同作用。Using Ti （OBu）4 as the precursor, S-Nd co-doped nano-TiO2 photocatalysts TiOz-S-Nd were prepared by sol-gel method in ionic liquids and microwave drying method. The structure of the catalysts were characterized by IR, XRD, BET and SEM. At the constant temperature （25 ℃ ）, under the illumina- tion and radiation conditions of MW, UV, MW/UV, the effects of doping amounts of Nd and S on photocat- alytic activity of nano-particle TiO2-S-Nd for degradation of methyl orange were investigated in the combi- nation of catalytic synthesis instrument with microwave ultrasonic. The results indicated that TiO2-S-Nd catalyst possessed the highest catalytic activity, which was prepared under the following condition：ionic liquid dosage 5.6 mL, n （Nd） ： n （ Ti ） = O. 015, n （ S ） ： n （ Ti ） = 2, and the semi-finished catalyst dried with the microwave heating at power 350 W for 20 min, then calcined at 700 ℃ in a high temperature fur- nace for 2 h. The degradation rate of methyl orange over TiO2-S-Nd catalyst were 12.11%, 88.91%, and 100% ,respectively under the dagradation conditions of MW, UV and MW/UV, which showed that MW had good synergy with UV, and MW/UV had the strengthening effect for degradation of methyl orange over TiO2-S-Nd catalyst. The photocatalytic activity of TiO2-S-Nd catalyst were higher than that of S or Nd doped TiO2 catalyst,which indicated that S and Nd codope had a synergistic effect.

关 键 词：催化化学 离子液体 微波强化 纳米TIO2 S和Nd共掺杂 光催化降解 

分 类 号：O643.36[理学—物理化学] TQ426.94[理学—化学]