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Ordered titania mesoporous materials synthesis and pore deposition heterojunction

Author: ZhouWei
Tutor: FuHongGang
School: Heilongjiang University
Course: Inorganic Chemistry
Keywords: mesoporous titania photocatalysis hydrophilicity electrodeposition
CLC: O614.411
Type: Master's thesis
Year: 2006
Downloads: 298
Quote: 0
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Abstract


In this dissertation, wormhole-like mesoporous titania and uniformed nanocrystalline titania have been successfully synthesized through evaporate-induced self-assembly （EISA） method. The obtained samples were characterized in detail by TG-DSC, XRD, Raman, AFM, SEM and TEM. As for wormhole-like mesoporous TiO2, the template can be removed completely and ordered wormhole-like mesoporous titania structure was formed after being calcinated at 350 ℃. As for uniformed nanocrystalline titania thin film, uniformed and spheric titania structure was formed after being calcinated at 400 ℃. The photocatalytic activity experiment of TiO2 powders with different calcination temperatures was also presented in this thesis. The highest photoactivity of wormhole-like mesoporous titania and uniformed nanocrystalline titania were presented at 400 ℃ and 500 ℃, respectively. The hydrophilicity of wormhole-like mesoporous titania thin film was higher than that of uniformed nanocrystalline titania thin film, which can be ascribed to the structure of its porous nature. Both obtained samples presented higher hydrophilicity after being irradiated by high press Hg lamp. Furthermore, the wormhole-like mesoporous titania thin film produced photo-induced super hydrophilicity because of its porous structure and more surface defect. CdS was deposited on the wormhole-like mesoporous titania thin film electrode through electrodeposition method. The photocurrent action spectra of ITO/TiO2/CdS composites thin film was demonstrated that CdS was successfully deposited on the surface and in the hole of mesoporous titania thin film. Furthermore, the range of

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section Ⅳ group metal elements and their compounds > The titanium Vice family ( IV B group metal elements) > Ti Ti
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