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Title: Photocatalytic oxidation of chlorophenols in single-component and multicomponent systems

Abstract

The photocatalytic oxidation of single-component and multicomponent systems consisting of chlorophenols in aqueous TiO{sub 2} suspension was investigated using long, medium, and short wavelength UV radiation. In the single-component experiments, 2-chlorophenol (2-CP), 2,4-dichlorophenol, 2,4,6-trichlorophenol, pentachlorophenol, and 4-chloro-3-methylphenol (4-Cl-3-MP) were found to degrade at the same rate. The rate of mineralization of 4-Cl-3-MP was higher than that of the others. Power law kinetic models for the temporal prediction of the degradation and mineralization profiles fitted the experimental results well for the single-component systems. The application of these models to represent the simultaneous oxidation of a binary mixture of 2-CP and 4-Cl-3-MP was examined for several equimolar and nonequimolar mixtures. Competitive inhibition kinetics were observed. Under equimolar feed conditions the rates of degradation of the total mixture were comparable to those for single-component systems and could be represented well by the model developed for single-component systems. When one of the two substrates was in excess, the overall oxidation kinetics were controlled by that substrate and the system could therefore be treated as a single-component system.

Authors:
;  [1]
  1. Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong). Dept. of Chemical Engineering
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
697163
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 38; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; CHLORINATED AROMATIC HYDROCARBONS; PHENOLS; PHOTOLYSIS; OXIDATION; TITANIUM OXIDES; CATALYTIC EFFECTS; ULTRAVIOLET RADIATION; KINETIC EQUATIONS

Citation Formats

Puma, G.L., and Yue, P.L. Photocatalytic oxidation of chlorophenols in single-component and multicomponent systems. United States: N. p., 1999. Web. doi:10.1021/ie9807598.
Puma, G.L., & Yue, P.L. Photocatalytic oxidation of chlorophenols in single-component and multicomponent systems. United States. doi:10.1021/ie9807598.
Puma, G.L., and Yue, P.L. Wed . "Photocatalytic oxidation of chlorophenols in single-component and multicomponent systems". United States. doi:10.1021/ie9807598.
@article{osti_697163,
title = {Photocatalytic oxidation of chlorophenols in single-component and multicomponent systems},
author = {Puma, G.L. and Yue, P.L.},
abstractNote = {The photocatalytic oxidation of single-component and multicomponent systems consisting of chlorophenols in aqueous TiO{sub 2} suspension was investigated using long, medium, and short wavelength UV radiation. In the single-component experiments, 2-chlorophenol (2-CP), 2,4-dichlorophenol, 2,4,6-trichlorophenol, pentachlorophenol, and 4-chloro-3-methylphenol (4-Cl-3-MP) were found to degrade at the same rate. The rate of mineralization of 4-Cl-3-MP was higher than that of the others. Power law kinetic models for the temporal prediction of the degradation and mineralization profiles fitted the experimental results well for the single-component systems. The application of these models to represent the simultaneous oxidation of a binary mixture of 2-CP and 4-Cl-3-MP was examined for several equimolar and nonequimolar mixtures. Competitive inhibition kinetics were observed. Under equimolar feed conditions the rates of degradation of the total mixture were comparable to those for single-component systems and could be represented well by the model developed for single-component systems. When one of the two substrates was in excess, the overall oxidation kinetics were controlled by that substrate and the system could therefore be treated as a single-component system.},
doi = {10.1021/ie9807598},
journal = {Industrial and Engineering Chemistry Research},
number = 9,
volume = 38,
place = {United States},
year = {1999},
month = {9}
}