Reductive dechlorination of aliphatic and aromatic compounds by zero-valent metals
- Manhattan College, Riversalde, NY (United States)
Zero-valent metals are versatile and powerful dehalogenating agents that can facilitate the reductive dechlorination of chlorinated pollutants by acting as direct electron donors to chlorinated pollutants or as electron donors to organometallic mediators that facilitate the electron transfer from the metal to the chlorinated pollutant. The ability of elemental zinc to act as reducing agent in the reductive dechlorination of CT and hexachlorobenzene (HCB) alone and in the presence of vitamin B{sub 12} was tested. Reductive dechlorination of CT in the presence of zince and B{sub 12} under nitrogen atmosphere led to a complete dechlorination of CT to methane gas. The CT concentration declined rapidly and an increase in the amount of methane gas formed was observed concurrently with a mass recovery averaging 50%. Other dechlorination products (chloroform CF, dichloromethane DCM, and chloromethane CM) were formed in small amounts. Reductive dechlorination of HCB with zinc resulted in the formation of pentachlorobenzene and occurred at higher rates in the absence of B{sub 12} with a pseudo-first order rate of 9.6 hr{sup -1}, compared to 6.3 hr{sup -1} in the presence of B{sub 12}.
- OSTI ID:
- 126409
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reductive dechlorination catalyzed by bacterial transition-metal coenzymes
Enrichment and properties of an anaerobic mixed culture reductively dechlorinating 1,2,3-trichlorobenzene to 1,3-dichlorobenzene