Kinetic modeling of the photocatalytic reduction of Cr (VI) in the presence of dye using composite photocatalyst

Kwena Pete, Maurice S. Onyango, Mika Sillanpää, Aoyi Ochieng

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Abstract

: The photocatalytic properties of surface TiO2 supported zeolite in a semi batch reactor for the reduction of Cr(VI) in the presence of methyl orange dye were investigated. The prepared composite photocatalyst was characterized by SEM-EDS (scanning electron microscopy and energy dispersive spectroscopy). The effects of operating parameters such as the pH and concentration of Cr(VI) in the absence and presence of dye were evaluated. The Cr(VI) reduction was more efficient in the ternary system (Cr(VI)/dye/TiO2-zeolite) than that of the corresponding binary system (Cr(VI)/TiO2-zeolite). The extent of metal reduction after 210 min of irradiation was 68% at pH = 3 for the ternary system. In order to optimize the effectiveness of the composite photocatalyst on the
photocatalytic reduction of Cr(VI), kinetics and isotherm models were applied. The kinetics of Cr(VI) in the presence of dye on TiO2/zeolite composite photocatalyst followed the pseudo-first-order model while the equilibrium data correlated reasonably well with Freundlich isotherm.
Original languageEnglish
Pages (from-to)918-924
JournalJournal of Chemistry and Chemical Engineering
Volume8
Publication statusPublished - 2014

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