Abstract:
TiO
2 photocatalyst which was doped with La
3+ and deposited Pt was prepared by using sol-gel-immersion method. Its degradation effect on direct fast blue was investigated. The results demonstrated that degradation effect of La
3+/Pt/TiO
2 with TiO
2 dry gel as motherbody,after La
3+,Pt
4+ was in turn immersed,was 80% higher than that of TiO
2,36% higher than that of La
3+/TiO
2 and 10.9% higher than that of Pt/TiO
2.XRD analysis indicated that anatase phase in TiO
2 was more than 95%,no oxidation phase of La
3+,Pt was deposited on the surface of La
3+/TiO
2,which was namometer-order atom. The mean crystal diameter was 7nm.FTIR analysis indicated that metal-ion doping and noble metal depositon could not greatly change the chemical structure of TiO
2.Photocatalytic activity was promoted because of electron-tractor effect of La
3+ and redistribution of photogenerated carriers. The deposition of noble metal was favorate to separate electron-hole pairs,but the effect of degradation was worse for higher deposition.
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