【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,采用溶胶-凝胶法和微波干燥法制备Zn掺杂的纳米TiO2光催化剂TiO2-Zn。室温条件下,以甲基橙为模拟污染物,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)和微波辐射联合紫外光照(MW-UV)降解方式,考察离子液体用量、Zn掺杂量、微波干燥功率、微波干燥时间、焙烧温度和焙烧时间等因素对TiO2-Zn光催化活性的影响。结果表明,在离子液体用量为5.6 mL、n(Zn)∶n(Ti)=0.012 5∶1、微波干燥功率210 W、微波干燥时间17.5 min、焙烧温度600℃和焙烧时间2 h条件下,制得的TiO2-Zn光催化剂具有较高的光催化活性。TiO2-Zn光催化剂在3种降解方式中对甲基橙的降解效果为:MW-UV>UV>MW,表明微波辐射-紫外光照具有较好的协同作用效果。更多还原

【Abstract】 Zn-doped nano-TiO2 photocatalysts were prepared in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate(PF6) by sol-gel and microwave drying method.The influence of ionic liquid dosage,Zn/Ti molar ratio,microwave drying power and drying time,calcination temperature and calcination time on the photocatalytic activities of TiO2-Zn catalysts was investigated by using methyl orange as simulated pollutant and ultraviolet lamp as the light source.The results showed that TiO2-Zn catalyst exhibited higher photocatalytic activity under the optimal condition as follows:ionic liquid dosage 5.6 mL,n(Zn)∶ n(Ti)=0.012 5∶ 1,microwave power 210 W,microwave drying time 17.5 min,calcination temperature 600 ℃ and calcination time 2 h.The sequence of degradation effect for methyl orange over TiO2-Zn catalyst under three irradiation conditions was:MW-UV>UV>MW,which indicated that MW-UV irradiation possessed good synergistic effect.更多还原