Microwave assisted preparation of Zn-doped nano-titania in ionic liquid and its photocatalytic activity
Zn-doped nano-TiO2 photocatalysts were prepared by microwave drying method in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate . The influence of ionic liquid dosage, Zn/Ti mole ratio,microwave drying power and drying time, calcination temperature and calcination time on the photocatalytic activities of Zn-doped nano-TiO2 were investigated using methyl orange as simulated pollutant and ultraviolet lamp as the light source. The results indicated that the preparation condition of Zn-doped nano-TiO2catalyst was as follows: ionic liquid dosage 5.6 mL,n(Zn):n(Ti) = 0.01:1, microwave power 210 W,microwave drying time 17.5 min,calcination temperature 600 ℃ and calcination time 1.5 h. Zn-doped nano-TiO2 catalyst exhibited higher photocatalytic activity than pure TiO2. The degradation rate of methyl orange over TiO2-Zn catalyst were 99.9％ under UV light for 90 min and 73.1％ under sun light for 4 h,respectively.
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