Photocatalytic reduction of Se(VI) in aqueous solutions in UV/TiO2 system: Kinetic modeling and reaction mechanism

Timothy T.Y. Tan; Donia Beydoun; Rose Amal

doi:10.1021/jp026149+

Photocatalytic reduction of Se(VI) in aqueous solutions in UV/TiO₂ system: Kinetic modeling and reaction mechanism

Timothy T.Y. Tan, Donia Beydoun, Rose Amal^*

^*Corresponding author for this work

University of New South Wales

Research output: Contribution to journal › Article › peer-review

56 Citations (Scopus)

Abstract

The kinetics of UV/TiO₂ photocatalytic reduction of Se(VI) in the presence of formic acid was investigated. Competitive adsorption models for the Se(VI) and HCOO^- ions onto the same active sites on TiO₂ surface were derived, based on the adsorption of one Se(VI) ion onto two adsorptive sites. The use of the above adsorption models allows for the modeling of the Se(VI) photoreduction rates on the basis of the Langmuir-Hinshelwood (LH) reaction mechanism. The new model was able to represent the experimental data reasonably well, and it supported the experimental observation that the optimum Se(VI) photoreduction rate occurred at the molar adsorption ratio of formate-to-Se(VI) ions of approximately 3:1. A composite rate expression incorporating the effect of catalyst loading was also presented.

Original language	English
Pages (from-to)	4296-4303
Number of pages	8
Journal	Journal of Physical Chemistry B
Volume	107
Issue number	18
DOIs	https://doi.org/10.1021/jp026149+
Publication status	Published - May 8 2003
Externally published	Yes

ASJC Scopus Subject Areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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title = "Photocatalytic reduction of Se(VI) in aqueous solutions in UV/TiO2 system: Kinetic modeling and reaction mechanism",

abstract = "The kinetics of UV/TiO2 photocatalytic reduction of Se(VI) in the presence of formic acid was investigated. Competitive adsorption models for the Se(VI) and HCOO- ions onto the same active sites on TiO2 surface were derived, based on the adsorption of one Se(VI) ion onto two adsorptive sites. The use of the above adsorption models allows for the modeling of the Se(VI) photoreduction rates on the basis of the Langmuir-Hinshelwood (LH) reaction mechanism. The new model was able to represent the experimental data reasonably well, and it supported the experimental observation that the optimum Se(VI) photoreduction rate occurred at the molar adsorption ratio of formate-to-Se(VI) ions of approximately 3:1. A composite rate expression incorporating the effect of catalyst loading was also presented.",

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TY - JOUR

T1 - Photocatalytic reduction of Se(VI) in aqueous solutions in UV/TiO2 system

T2 - Kinetic modeling and reaction mechanism

AU - Tan, Timothy T.Y.

AU - Beydoun, Donia

AU - Amal, Rose

PY - 2003/5/8

Y1 - 2003/5/8

N2 - The kinetics of UV/TiO2 photocatalytic reduction of Se(VI) in the presence of formic acid was investigated. Competitive adsorption models for the Se(VI) and HCOO- ions onto the same active sites on TiO2 surface were derived, based on the adsorption of one Se(VI) ion onto two adsorptive sites. The use of the above adsorption models allows for the modeling of the Se(VI) photoreduction rates on the basis of the Langmuir-Hinshelwood (LH) reaction mechanism. The new model was able to represent the experimental data reasonably well, and it supported the experimental observation that the optimum Se(VI) photoreduction rate occurred at the molar adsorption ratio of formate-to-Se(VI) ions of approximately 3:1. A composite rate expression incorporating the effect of catalyst loading was also presented.

AB - The kinetics of UV/TiO2 photocatalytic reduction of Se(VI) in the presence of formic acid was investigated. Competitive adsorption models for the Se(VI) and HCOO- ions onto the same active sites on TiO2 surface were derived, based on the adsorption of one Se(VI) ion onto two adsorptive sites. The use of the above adsorption models allows for the modeling of the Se(VI) photoreduction rates on the basis of the Langmuir-Hinshelwood (LH) reaction mechanism. The new model was able to represent the experimental data reasonably well, and it supported the experimental observation that the optimum Se(VI) photoreduction rate occurred at the molar adsorption ratio of formate-to-Se(VI) ions of approximately 3:1. A composite rate expression incorporating the effect of catalyst loading was also presented.

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Photocatalytic reduction of Se(VI) in aqueous solutions in UV/TiO₂ system: Kinetic modeling and reaction mechanism

Abstract

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