The Preparation of Rutile TiO2 Nanopowders, Phase Transformation and Their Photocatalysed Properties

Jing Sun; Lian Gao

doi:10.4028/www.scientific.net/MSF.486-487.37

Paper Titles

Structure and Photoluminescence Properties of ZnO:Al/Porous Silicon Thin Films
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Morphology and Microstructure of Graphitic Nanofibers Synthesized by the CVD Method Using Nickel-Copper as a Catalyst
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Sensitivity and Thermal Property of Polyaniline Sensor
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Characteristic of Titania Photocatalyst Fine Particles Added Zirconia
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The Preparation of Rutile TiO₂ Nanopowders, Phase Transformation and Their Photocatalysed Properties
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Decomposition of Dioxins in Gas and Water Using Photocatalytic Silica-Gel
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Bond Cleavage of Nitrogen-Bearing Organics with "Molecular Scissors" of Titania for Aquatic Remediation
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Photocatalytic Activities of Plasma Sprayed TiO₂-Based Coatings
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The Preparation of Rutile TiO₂ Doped with Rare Earth Metal Ions, Sulfur and Their Photocatalytic Properties
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HomeMaterials Science ForumMaterials Science Forum Vols. 486-487The Preparation of Rutile TiO2 Nanopowders, Phase...

The Preparation of Rutile TiO₂ Nanopowders, Phase Transformation and Their Photocatalysed Properties

Abstract:

Rutile TiO2 nanoparticles have been synthesized by direct hydrolysis method using TiCl3, TiCl4 as starting materials, yielding two different morphologies. The hydrolysis of TiCl3 resulted in needlelike rutile titania with the specific surface area of 74.5m2/g, while round particles about 200~400 nm with small acicular at edge, with specific area as high as 175m2/g, were obtained using TiCl4 as starting materials. The precipitates from TiCl4 hydrolysis could be changed into anatase phase without filtering and separation by varying pH of the system. The phenomenon was explained from the viewpoint of structure. The photocatalysed properties of rutile powders were compared with those of anatase of the same specific surface area. Rutile powders with initial crystalline size of 7 nm were found to have higher photocatalysed activity in the phenol degradation reaction than that which anatase has. The high activity of the as prepared lab-made rutile was attributed to the abundance of hydroxy groups in powders, which was proved by TG data, making the degradation reaction have more active sites. The agglomeration form of the rutile powder makes it easy for separation and reuse.