【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。更多还原

【Abstract】 Using Ti( OBu) 4 as the precursor,S- Nd co- doped nano- TiO2 photocatalysts TiO2- 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 illumination and radiation conditions of MW,UV,MW / UV,the effects of doping amounts of Nd and S on photocatalytic activity of nano- particle TiO2- S- Nd for degradation of methyl orange were investigated in the combination 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) = 0. 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 furnace 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 TiO catalyst,which indicated that S and Nd codope had a synergistic effect.更多还原