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Effect of Fe^(3+) doping on the performance of TiO_2 mechanocoated alumina bead photocatalysts
Cyril Jose Escopete Bajamundi,Nurak Grisdanurak,Maria Lourdes Pascual Dalida,Kitirote Wantala,Pongtanawat Khemthong 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.8
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 TiO_2 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, N_2 adsorption-desorption isotherms, scanning electron 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 Fe^(3+) doped TiO_2/Al_2O_3 has a combination of anatase and rutile phase and free of iron oxide phases. The optimum calcination temperature is 400℃ with 0.1% Fe^(3+) concentration. The catalyst addresses the entrainment in photocatalytic reactors, eliminating the need for a post filtration process.