Photocatalytic Degradation of Dyes by Al2O3-TiO2 and ZrO2-TiO2 Nanocomposites

C. Karunakaran; P. Magesan; P. Gomathisankar; P. Vinayagamoorthy

doi:10.4028/www.scientific.net/MSF.734.325

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HomeMaterials Science ForumMaterials Science Forum Vol. 734Photocatalytic Degradation of Dyes by Al2O3-TiO2...

Photocatalytic Degradation of Dyes by Al₂O₃-TiO₂ and ZrO₂-TiO₂ Nanocomposites

Abstract:

Al₂O₃-TiO₂ and ZrO₂-TiO₂ nanocomposites have been prepared by sol-gel method using polyvinylpyrrolidone-polyethylene glycol (PVP-PEG) as templating agents. While Al₂O₃ in the former is of end-centered monoclinic crystal structure ZrO₂ in the latter is a 4:1 blend of monoclinic and tetragonal phases. In both the composites TiO₂ is present as anatase. The energy dispersive X-ray spectra provide the compositions of the composites as Al:Ti::1:12 and Zr:Ti::1:1. Scanning electron micrographs display the sizes of Al₂O₃-TiO₂ and ZrO₂-TiO₂ particles as 30-77 and 38-57 nm, respectively. The diffuse reflectance spectra of both the composites show band gap excitation in the UV-A region. Both the composites display similar photoluminescence and the observed near band gap emission and deep level emission agree with those of TiO₂. The impedance spectral studies reveal that the charge-transfer resistance of ZrO₂-TiO₂ is less than that of Al₂O₃-TiO₂. Both the composites exhibit photoconductance. The photocatalytic activities of the prepared nanocomposites depend on the dye employed. While both the composites degrade methylene blue and rhodamine B effectively under UV-A light the photodegradation of methyl orange is slow. Rhodamine B degrades on both the nanocomposites under visible light also, which is through dye-sensitized photocatalytic mechanism.

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Materials Science Forum (Volume 734)

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325-333

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https://doi.org/10.4028/www.scientific.net/MSF.734.325

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Online since:

December 2012

Authors:

C. Karunakaran, P. Magesan, P. Gomathisankar, P. Vinayagamoorthy

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Nanoparticle, Photocatalysis, Photodegradation, Sol-Gel Method

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