Brookite versus anatase TiO2photocatalysts: phase transformations and photocatalytic activities
نویسندگان
چکیده
منابع مشابه
Nd/TiO2 Anatase-Brookite Photocatalysts for Photocatalytic Decomposition of Methanol
Neodymium enriched TiO2 anatase-brookite powders were prepared by unconventional method via using pressurized hot fluids for TiO2 crystallization and purification. The photocatalysts were tested in the CH3OH photocatalytic decomposition and they were characterized with respect to the textural (nitrogen adsorption), structural (XRD, XPS, and Raman spectroscopies), chemical (XRF), and optical (DR...
متن کاملNew understanding of the difference of photocatalytic activity among anatase, rutile and brookite TiO2.
In general, anatase TiO2 exhibits higher photocatalytic activities than rutile TiO2. However, the reasons for the differences in photocatalytic activity between anatase and rutile are still being debated. In this work, the band structure, density of states, and effective mass of photogenerated charge carriers for anatase, rutile and brookite TiO2 are investigated by the first-principle density ...
متن کاملPreparation and photoactivity of nanostructured anatase, rutile and brookite TiO2 thin films.
Photoactive films consisting of pure anatase, brookite or rutile TiO2 were prepared by dip coating from water dispersions obtained by using TiCl4 as the precursor under similar mild experimental conditions.
متن کاملLow-Temperature Sol-Gel Synthesis of Nitrogen-Doped Anatase/Brookite Biphasic Nanoparticles with High Surface Area and Visible-Light Performance
Nitrogen doping in combination with the brookite phase or a mixture of TiO2 polymorphs nanomaterials can enhance photocatalytic activity under visible light. Generally, nitrogendopedanatase/brookite mixed phases TiO2 nanoparticles obtained by hydrothermal or solvothermal method need to be at high temperature and with long time heating treatment. Furthermore, the surface areas of them are low (<...
متن کاملUnderstanding the effect of surface/bulk defects on the photocatalytic activity of TiO2: anatase versus rutile.
The sole effect of surface/bulk defects of TiO2 samples on their photocatalytic activity was investigated. Nano-sized anatase and rutile TiO2 were prepared by hydrothermal method and their surface/bulk defects were adjusted simply by calcination at different temperatures, i.e. 400-700 °C. High temperature calcinations induced the growth of crystalline sizes and a decrease in the surface areas, ...
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ژورنال
عنوان ژورنال: Photochem. Photobiol. Sci.
سال: 2013
ISSN: 1474-905X,1474-9092
DOI: 10.1039/c2pp25217a