Shawnee A



C. Hong, Y. Wang, and Y. Wang, Environmental Health and Toxicology, School of Public Health, State University of New York and Wadsworth Center, New York State Department of Health, Albany, NY 12201-0509 2-Chlorobiphenyl (2-CB) was decomposed photocatalytically in air-equilibrated aqueous TiO2 dispersions under WA-340 irradiation. The hydroxylation of 2-CB, the cleavage of the aromatic moiety, the intermediacy of aldehydes, ketones and acids, and the ultimate mineralization to CO2 were examined. The photodegradation kinetics are discussed in terms of Langmuir-Hinshewood model. The effects of light intensity, pH, concentration of reactant, and concentration of TiO2 on photonic efficiency were examined.

The removal of 2- CB was found to be more effective for acidic solutions. The decomposition of 2-CB can be fitted well by a pseudo first-order kinetics. The degradation rate increased linearly with the increase of square root of light intensity less than 1 sun. When small amounts of hydrogen peroxide or other inorganic oxidants were added to the system, the degradation was enhanced significantly. The addition of humic acid can cause a decrease in the photocatalytic oxidation of 2-CB. The effects of the nature and the source of two TiO2 specimens on photonic efficiency were also explored.

Key words: photodegradation, kinetics, mineralization, TiO2, 2-chlorobiphenyl

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Tuesday, May 20, 1997

Metals Kansa A

Remediation of Munitions Compounds Kansa B

Analytical Methods Kansa C/D

General Topics Kansa B

Wednesday, May 21, 1997

Metals Kansa A

Zero-Valent Metals Kansa A

Remediation Kansa A

Vegetation-based Remediation Kansa B

Partnerships & Innovative Technologies Kansa C/D

Nonaqueous Phase Liquids Kansa C/D

Thursday, May 22, 1997

Biofilms & Barriers Kansa A

Bioremediation Kansa B

Partnerships & Technology Innovations Kansa C/D

Remediation Kansa C/D


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