Li Yanping 讨论制备方法对光催化剂 CuO/TiO 2 活性的影响

Recent experimental summary Other researchers’ reports

1.Fabrication and comparison of highly efficient Cu incorporated TiO 2 photocatalyst for hydrogen generation from water Efficient Cu incorporated TiO 2 photocatalysts for hydrogen generation were fabricated by four methods: in situ sol-gel, wet impregnation, chemical reduction of Cu salt, and in situ photo-deposition.

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

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.

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

3. Boccuzzi et al. compared properties and activity of Cu-TiO 2 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/TiO 2 catalysts. 2. Effect of the catalyst morphology on the hydrogenation of 1,3- cyclooctadiene and the CO-NO reaction on Cu/TiO 2 catalysts. J Catal 1997;165: Boccuzzi F, Chiorino A, Martra G, Gargano M, Ravasio N,Carrozzini B. Preparation, characterization, and activity of Cu/TiO 2 catalysts. 1. Influence of the preparation method on the dispersion of copper in Cu/TiO 2. J Catal 1997;165:

Recent experimental summary

1.Different preparation methods of CuO/TiO 2 catalysts 1.1 The activity of catalyst

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

69.9% The stability of the ethanol impregnation

Activity decline ： x-initial initial 活性 1.34 倍，下降 1.5 倍

H 2 -TPR

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

3.9nm 3nm,33nm

2% CuO/TiO 2 S BET (m 2 /g) Pore diameter (nm) Pore volume (cm 3 /g) Chemical adsorption Composite deposition Ethanol impregnation Sol-gel Simple wet impregnation Second impregnation Specific surface area,pore diameter and pore volume of the catalysts

N 2 adsorption stripping curve

H 2 -TPR

Uv-vis

Plasmonic photocatalysis(Ag/SiO 2 core –shell ， TiO 2 ) Reason ： TiO 2,3.2eV, 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 TiO 2 A Plasmonic Photocatalyst Consisting of Silver Nanoparticles Embedded in Titanium Dioxide

To prevent this oxidation, Ag NPs have to be coated with a passive material, such as SiO 2, to separate them from TiO 2.