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Visible light assisted photocatalytic degradation of organic dyes on TiO2-CNT nanocomposites

Hemalatha, K and Ette, Pedda Masthanaiah and Madras, Giridhar and Ramesha, K (2015) Visible light assisted photocatalytic degradation of organic dyes on TiO2-CNT nanocomposites. In: JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 73 (1). pp. 72-82.

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Official URL: http://dx.doi.org/ 10.1007/s10971-014-3496-0

Abstract

Carbon nanotubes (CNTs) uniformly decorated with nano-anatase TiO2 particles corresponding to different TiO2-CNT weight ratios (up to 90 % TiO2:10 % CNT) were prepared by employing sol-gel process. The nanocomposites were characterized by X-ray diffraction, IR, Raman, Scanning electron microscopy, Transmission electron microscopy, Photoluminescence, BET surface area and diffuse reflectance measurements. The composites show visible light assisted photocatalytic property, for example, the 90 % TiO2-10 % CNT composite completely degrades Indigo Carmine dye within 1 h of exposure to visible light. Similarly, Orange G and Congo Red dyes were decomposed within 2 h under visible light irradiation. The excellent visible light photocatalytic property of the composite is attributed to the synergetic effect of photoexcitation and photosensitization. This is due to the special nanoarchitecture wherein TiO2 nanoparticles are anchored to CNT surface that provides high specific interfacial area for photon absorption and electron trapping. Visible light assisted degradation profile of Indigo Carmine in the presence of TiO2-CNT nanocomposite and TEM image of the TiO2-CNT nanocomposite.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Keywords: TiO2-CNT; Photocatalysis; Dye degradation; XRD
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 04 Mar 2015 12:47
Last Modified: 04 Mar 2015 12:47
URI: http://eprints.iisc.ac.in/id/eprint/50995

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