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

Research output: Contribution to journalArticle

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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Photocatalysts
Coloring Agents
Zeolites
Kinetics
Composite materials
Ternary systems
Isotherms
Batch reactors
chromium hexavalent ion
Energy dispersive spectroscopy
Metals
Irradiation
Scanning electron microscopy

Cite this

@article{5c97b2d21f2f47b28427b313e03649e4,
title = "Kinetic modeling of the photocatalytic reduction of Cr (VI) in the presence of dye using composite photocatalyst",
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 thephotocatalytic 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.",
author = "Kwena Pete and Onyango, {Maurice S.} and Mika Sillanp{\"a}{\"a} and Aoyi Ochieng",
year = "2014",
language = "English",
volume = "8",
pages = "918--924",
journal = "Journal of Chemistry and Chemical Engineering",
issn = "1934-7383",

}

Kinetic modeling of the photocatalytic reduction of Cr (VI) in the presence of dye using composite photocatalyst. / Pete, Kwena; Onyango, Maurice S.; Sillanpää, Mika; Ochieng, Aoyi.

In: Journal of Chemistry and Chemical Engineering, Vol. 8, 2014, p. 918-924.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Kinetic modeling of the photocatalytic reduction of Cr (VI) in the presence of dye using composite photocatalyst

AU - Pete, Kwena

AU - Onyango, Maurice S.

AU - Sillanpää, Mika

AU - Ochieng, Aoyi

PY - 2014

Y1 - 2014

N2 - : 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 thephotocatalytic 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.

AB - : 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 thephotocatalytic 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.

M3 - Article

VL - 8

SP - 918

EP - 924

JO - Journal of Chemistry and Chemical Engineering

JF - Journal of Chemistry and Chemical Engineering

SN - 1934-7383

ER -