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Specific Photocatalytic Performance of Nanostructured Rutile-Type TiO2: Selective Oxidation of Thiazin Dye with a Bundled Architecture Consisting of Oriented Nanoneedles

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The photocatalytic activity of a nanostrcutured rutile consisting of oriented nanoneedles was studied by comparing a reaction of a thiazin dye, methylene blue, with dispersed rutile nanoneedles and anatase nanoparticles. Demethylation of methylene blue occurred preferably through partial oxidation under UV irradiation with the bundled rutile nanoneedles having small clearance gaps. On the other hand, most of the dye molecules were directly decolorized through the initiation by a reductive pathway with the dispersed rutile nanorods and the anatase nanoparticles. The reductive sites on (110) of the rutile nanoneedles were dominantly located in the small gaps inside the bundled architecture. Because the diffusion of large-sized organic molecules to the reductive sites would be restricted, the oxidative route for the dye molecule was selectively induced with the rutile bundles under UV irradiation.
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Keywords: ANATASE; METHYLENE BLUE; PHOTOCATALYST; RUTILE; TITANIA

Document Type: Research Article

Publication date: 2010-03-01

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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