Sensitized photocatalysis of a mixed reactant system of 4-chlorophenol and 4-nitrophenol

Melissa S. Dieckmann; Kimberly A. Gray; Prashant V. Kamat

Sensitized photocatalysis of a mixed reactant system of 4-chlorophenol and 4-nitrophenol

Melissa S. Dieckmann^*, Kimberly A. Gray, Prashant V. Kamat

^*Corresponding author for this work

Civil and Environmental Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Scopus citations

Abstract

Sensitized photocatalysis has been demonstrated with colored pollutants such as nitrophenols. With visible light excitation of an adsorbed nitrophenolic compound, charge injection into the conduction band of the semiconductor occurs and subsequent transformation of nitrophenols to a variety of products is possible. These phenomena have been observed in powder systems of TiO₂, but have not been clearly detailed in aqueous systems. This work reports the results of aqueous TiO₂ slurry experiments in which the degradation of 4-nitrophenyl and 4-chlorophenyl is studied in single reactant and mixed reactant systems. The primary objectives of this work are to establish the reaction pathway occurring in sensitized photocatalysis and to determine if sensitization can induce/drive the degradation of non-colored pollutants. The influence of organic concentration, oxygen and light energy are discussed and byproduct data are presented.

Original language	English (US)
Title of host publication	Critical Issues in Water and Wastewater Treatment
Editors	Joseph N. Ryan, Marc Edwards
Publisher	Publ by ASCE
Pages	726-732
Number of pages	7
ISBN (Print)	0784400318
State	Published - Jan 1 1994
Event	Proceedings of the 1994 National Conference on Environmental Engineering - Boulder, CO, USA Duration: Jul 11 1994 → Jul 13 1994

Other

Other	Proceedings of the 1994 National Conference on Environmental Engineering
City	Boulder, CO, USA
Period	7/11/94 → 7/13/94

ASJC Scopus subject areas

Environmental Engineering

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title = "Sensitized photocatalysis of a mixed reactant system of 4-chlorophenol and 4-nitrophenol",

abstract = "Sensitized photocatalysis has been demonstrated with colored pollutants such as nitrophenols. With visible light excitation of an adsorbed nitrophenolic compound, charge injection into the conduction band of the semiconductor occurs and subsequent transformation of nitrophenols to a variety of products is possible. These phenomena have been observed in powder systems of TiO2, but have not been clearly detailed in aqueous systems. This work reports the results of aqueous TiO2 slurry experiments in which the degradation of 4-nitrophenyl and 4-chlorophenyl is studied in single reactant and mixed reactant systems. The primary objectives of this work are to establish the reaction pathway occurring in sensitized photocatalysis and to determine if sensitization can induce/drive the degradation of non-colored pollutants. The influence of organic concentration, oxygen and light energy are discussed and byproduct data are presented.",

author = "Dieckmann, {Melissa S.} and Gray, {Kimberly A.} and Kamat, {Prashant V.}",

year = "1994",

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day = "1",

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pages = "726--732",

editor = "Ryan, {Joseph N.} and Marc Edwards",

booktitle = "Critical Issues in Water and Wastewater Treatment",

publisher = "Publ by ASCE",

note = "Proceedings of the 1994 National Conference on Environmental Engineering ; Conference date: 11-07-1994 Through 13-07-1994",

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AU - Dieckmann, Melissa S.

AU - Gray, Kimberly A.

AU - Kamat, Prashant V.

PY - 1994/1/1

Y1 - 1994/1/1

N2 - Sensitized photocatalysis has been demonstrated with colored pollutants such as nitrophenols. With visible light excitation of an adsorbed nitrophenolic compound, charge injection into the conduction band of the semiconductor occurs and subsequent transformation of nitrophenols to a variety of products is possible. These phenomena have been observed in powder systems of TiO2, but have not been clearly detailed in aqueous systems. This work reports the results of aqueous TiO2 slurry experiments in which the degradation of 4-nitrophenyl and 4-chlorophenyl is studied in single reactant and mixed reactant systems. The primary objectives of this work are to establish the reaction pathway occurring in sensitized photocatalysis and to determine if sensitization can induce/drive the degradation of non-colored pollutants. The influence of organic concentration, oxygen and light energy are discussed and byproduct data are presented.

AB - Sensitized photocatalysis has been demonstrated with colored pollutants such as nitrophenols. With visible light excitation of an adsorbed nitrophenolic compound, charge injection into the conduction band of the semiconductor occurs and subsequent transformation of nitrophenols to a variety of products is possible. These phenomena have been observed in powder systems of TiO2, but have not been clearly detailed in aqueous systems. This work reports the results of aqueous TiO2 slurry experiments in which the degradation of 4-nitrophenyl and 4-chlorophenyl is studied in single reactant and mixed reactant systems. The primary objectives of this work are to establish the reaction pathway occurring in sensitized photocatalysis and to determine if sensitization can induce/drive the degradation of non-colored pollutants. The influence of organic concentration, oxygen and light energy are discussed and byproduct data are presented.

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BT - Critical Issues in Water and Wastewater Treatment

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