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納米二氧化鈦的制備與光催化性能研究-閱讀頁

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The samples were heat treated at different temperatures under oxidizing (air), inert (N2), and reducing (N2/H2) conditions before removing the template under air atmosphere at 350 176。 also the range of pore wall materials has been extended from SiO2 to other metal oxides (., Ti, Fe, Al).5?7A typical simple synthesis pathway for OMMs is a template synthesis (Liquid Crystal Templating8) in which the type of template defines the pore arrangement and size. Here different approaches like evaporation induced selfassembly (EISA) or synthesis with regularly packed monodispersive polymethyl methacrylate (PMMA) microspheres9 are feasible. For the EISA approach important factors described in the literature are the hydrolysis ratio, type of the solvent, concentration of the surfactant, and the titanium After synthesis the template has to be removed from the sample to make the pores accessible. This can be achieved by thermal treatment (calcination) or In most cases OMMTiO2 materials are heat treated, during this step the interplay between pore wall material and the pore system is very important to achieve the desired properties of the pounds. The most important factor is the choice of the calcination temperature, which determines the final degree of order of the OMM and must be chosen in such a way that it is high enough to remove the template pletely but low enough so that crystallization processes in the pore wall material are not destroying the pores. Several approaches to overe these limitations have been proposed (., the strengthening of the pores by in situ formed carbon12 or approaches like the ″brick and mortar″ strategy13).With regard to the applicability of ordered mesoporous materials (OMM) especially TiO2 based OMMs are promising materials for technical applications due to the photocatalytic properties of the anatase TiO2 It was shown thatthe nanostructuring of TiO2 is able to enhance the photocatalytic efficiency significantly pared to mercially available products (., Degussa P2514,15).The processes taking place in the OMMs during calcination are wellknown qualitatively. The higher the calcination temperature
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