Program One
Wednesday, May 21, 1997

Zero-Valent Metals Kansa A



W. Li and K.J. Klabunde, Department of Chemistry, Kansas State University, Manhattan, KS 66506 Zinc can be an effective reductant in the dechlorination/destruction of organic chlorocarbons that contaminate ground water. This reagent can help achieve the efficient removal of chlorocarbons with high capacity. Trichloroethylene (TCE), one of the most common contaminants, was found to be degraded by zero-valent Zn in aqueous solutions at room temperature.

We studied the enhanced reactivities of Zn as promoted by bimetallic combinations with Ag, Ni, and Pd. The amount of time required to complete the dechlorination was found to vary from a few hours to many days. The highest efficiency was obtained in the presence of cryo-Zn (ultrafine Zn) particles and palladium promotor.

Important intermediates in the degradative pathways were investigated to further elucidate the dominant pathway and general mechanism. A variety of techniques was employed to analyze the gaseous, aqueous, and solid phase. Ethylene, ethane, and monochlorinated hydrocarbons were identified as the hydrogenation or elimination products. Dehydrochlorination or (-elimination was also evident by acetylene appearance. Other related Cl and C2 compounds were produced in much smaller yields. These results and further issues of interests will be discussed.

Key words: dechlorination, trichloroethylene, dichloroethenes

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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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