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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 5, 2010
Accepted February 5, 2011

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Effect of Fe3+ doping on the performance of TiO2 mechanocoated alumina bead photocatalysts

Cyril Jose Escopete Bajamundi Maria Lourdes Pascual Dalida Kitirote Wantala¹ Pongtanawat Khemthong² Nurak Grisdanurak^3†

Department of Chemical Engineering, College of Engineering, University of the Philippines, Diliman 1101, Philippines ¹Department of Chemical Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand ²National Nanotechnology Center, NSTDA, Pathumthani 12120, Thailand ³NCE for Environmental and Hazardous Waste Management, Faculty of Engineering, Thammasat University, Pathumthani 12120, Thailand

gnurak@engr.tu.ac.th

Korean Journal of Chemical Engineering, August 2011, 28(8), 1688-1692(5), 10.1007/s11814-011-0031-7

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Abstract

Ferric ion was introduced to the commercial photocatalyst P25 (Degussa) by ultrasonic wet impregnation technique. The concentration of the dopant was varied from 0.0 to 3.0% Fe/Ti ratio. The doped TiO2 was then loaded to alumina balls using mechanical coating technique and followed by calcination in air at 400, 450, 500 and 550 ℃ . The fabricated photocatalyst was characterized by X-ray diffraction, N2 adsorption-desorption isotherms, scanning electron_x000D_ microscopy, UV-Vis diffuse reflectance spectroscopy, X-ray adsorption near edge structure and photoluminescence spectroscopy. The photocatalytic activity was tested by following the degradation of methylene blue (MB). It was found that the Fe3+ doped TiO2/Al2O3 has a combination of anatase and rutile phase and free of iron oxide phases. The optimum calcination temperature is 400 oC with 0.1% Fe3+ concentration. The catalyst addresses the entrainment_x000D_ in photocatalytic reactors, eliminating the need for a post filtration process.

Keywords

TiO2 Fe3+ Dopant Mechanical Coating Technique Al2O3 Beads

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