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Shawnee A


    P34

TITANIUM DIOXIDE MEDIATED PHOTOCATALYTIC DEGRADATION OF 2-CHLOROBIPHENYL

 
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

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Wednesday, May 21, 1997

Metals Kansa A

Zero-Valent Metals Kansa A

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Partnerships & Innovative Technologies Kansa C/D

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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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