Photocatalytic oxidation of chlorophenols in single-component and multicomponent systems

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie9807598· OSTI ID:697163

Puma, G L; Yue, P L ^[1]

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1. Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong). Dept. of Chemical Engineering

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.

• Sponsoring Organization: USDOE
• OSTI ID: 697163
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 9 Vol. 38; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CATALYTIC EFFECTS
CHLORINATED AROMATIC HYDROCARBONS
KINETIC EQUATIONS
OXIDATION
PHENOLS
PHOTOLYSIS
TITANIUM OXIDES
ULTRAVIOLET RADIATION