Li Yanping 20130728

1. 讨论制备方法对光催化剂 CuO/TiO2活性的影响 Li Yanping 20130728

3. Other researchers’ reports

4. Fabrication and comparison of highly efficient Cu incorporated TiO2photocatalystfor hydrogen generation from water Efficient Cu incorporated TiO2photocatalystsfor hydrogen generation were fabricated by four methods: in situ sol-gel, wet impregnation, chemical reduction of Cu salt, and in situ photo-deposition.

5. Characteristics: different chemical states of Cu different distribution ratio of Cu between surface and bulk phases of the photocatalyst the Cu content in the photocatalystplay a significant role in hydrogen generation Conclusion: situ sol-gel method exhibited the highest stability

6. It was discovered that the fabrication methods determined: the chemical state of Cu, distribution ratio of Cu within the photocatalyst, BET surface area of thecatalyst, crystal structure of the TiO2support.

9. 2. Wu and Lee reported that Cu doping within the TiO2 lattice had a negative effect on photocatalytic hydrogen generation as opposed to Cu deposition. Wu NL, Lee MS. Enhanced TiO2photocatalysis by Cu in hydrogen production from aqueous methanol solution. Int J Hydrog Energy 2004;29:1601-5.

10. 3. Boccuzziet al. compared properties and activity of Cu-TiO2 prepared by wet impregnation and chemisorption hydrolysis methods, and found that samples with the same chemical composition exhibited a marked difference of up to 100 times in the hydrogenation of 1,3-cyclooctadiene. Boccuzzi F, Chiorino A, Gargano M, Ravasio N. Preparation,characterization, and activity of Cu/TiO2catalysts. 2. Effect of the catalyst morphology on the hydrogenation of 1,3-cyclooctadiene and the CO-NO reaction on Cu/TiO2 catalysts. J Catal1997;165:140-9. Boccuzzi F, Chiorino A, Martra G, Gargano M, RavasioN,CarrozziniB. Preparation, characterization, and activity of Cu/TiO2catalysts. 1. Influence of the preparation method on the dispersion of copper in Cu/TiO2. J Catal1997;165:129-39.

11. Recent experimental summary

12. 1.Different preparation methods of CuO/TiO2catalysts 1.1 The activity of catalyst

13. 1.2The stability of the catalysts The stability of the chemical adsorption 54.6%

14. The stability of the ethanol impregnation 69.9%

15. Activity decline：x-initial initial 活性1.34倍，下降1.5倍 -0.3 -0.45

16. H2-TPR

17. 1.3BET data of the catalysts Pore distribution of the catalyst 2nm,31nm 26nm

18. 3.9nm 3nm,33nm

19. Specific surface area,pore diameter and pore volume of the catalysts

20. N2 adsorption stripping curve

21. H2-TPR

23. Uv-vis

24. Plasmonicphotocatalysis(Ag/SiO2core –shell，TiO2) Reason： TiO2,3.2eV, near UV irradiation can excite pairs of electrons and holes Ag NPs ,a very intense LSP absorption band in the near-UV a considerable enhancement of the electric near-field in the vicinity of the Ag NPs enhanced near-field could boost the excitation of electron –hole pairs But, Ag NPs, would be oxidized at direct contact with TiO2 A PlasmonicPhotocatalyst Consisting of Silver Nanoparticles Embedded in Titanium Dioxide

25. To prevent this oxidation, Ag NPs have to be coated with a passive material, such as SiO2, to separate them from TiO2.

27. Thanks