Solar Photocatalysis of Methyl Orange Using Multi-Ion Doped TiO2 Catalysts

Victor R. Thulari, John Akach, Haleden Chiririwa, Aoyi Ochieng

Research output: Contribution to journalArticle

Abstract

Solar-light activated titanium dioxide photocatalysts were prepared by hydrolysis of titanium (IV) isopropoxide with thiourea, followed by calcinations at 450 °C. The experiments demonstrated that methyl orange in aqueous solutions were successfully degraded under solar light using doped TiO2. The
photocatalytic oxidation of a mono azo methyl-orange dye has been
investigated in multi ion doped TiO2 and solar light. Solutions were
irradiated by solar-light until high removal was achieved. It was
found that there was no degradation of methyl orange in the dark and in the absence of TiO2. Varieties of laboratory prepared TiO2 catalysts both un-doped and doped using titanium (IV) isopropoxide and thiourea as a dopant were tested in order to compare their photoreactivity. As a result, it was found that the efficiency of the process strongly depends on the working conditions. The highest degradation rate of methyl orange was obtained at optimum dosage using commercially produced TiO2. Our work focused on laboratory
synthesized catalyst and the maximum methyl orange removal was achieved at 81% with catalyst loading of 0.04 g/L, initial pH of 3 and methyl orange concentration of 0.005 g/L using multi-ion doped
catalyst. The kinetics of photocatalytic methyl orange dye stuff degradation was found to follow a pseudo-first-order rate law. The presence of the multi-ion dopant (thiourea) enhanced the
photoefficiency of the titanium dioxide catalyst.
Original languageEnglish
Pages (from-to)1472-1477
Number of pages6
JournalInternational Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering
Volume10
Issue number12
Publication statusPublished - 2016

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