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Complete Dechlorination of DDE/DDD Using Magnesium/Palladium System
Author(s) -
Gautam Sumit Kumar,
Suresh Sumathi
Publication year - 2007
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143006x115336
Subject(s) - chemistry , palladium , halogenation , chlorine , reactivity (psychology) , magnesium , ethylene , reductive dechlorination , hydrocarbon , medicinal chemistry , inorganic chemistry , organic chemistry , catalysis , biodegradation , medicine , alternative medicine , pathology
Kinetic studies on the dechlorination of 1,1‐dichloro‐2,2 bis (4,‐chlorophenyl) ethane (DDD) and 1,1,dichloro‐2,2 bis (4,‐chlorophenyl) ethylene (DDE) in 0.05% biosurfactant revealed that the reaction follows second‐order kinetics. The rate of reaction was dependent on the presence of acid, initial concentrations of the target compound, and zerovalent magnesium/tetravalent palladium. Gas chromatography‐mass spectrometry analyses of DDE dechlorination revealed the formation of a completely dechlorinated hydrocarbon skeleton, with diphenylethane as the end product, thereby implying the removal of all four chlorine atoms of DDE. In the case of DDD, we identified two partially dechlorinated intermediates [namely, 1, 1‐dichloro‐2, 2 bis (phenyl) ethane and 1, chloro‐2, 2 bis (phenyl) ethane] and diphenylethane as the end product. On the basis of products formed from DDD dehalogenation, we propose the removal of aryl chlorine atoms as a first step. Our investigation reveals that biosurfactant may be an attractive solubilizing agent for DDT and its residues. The magnesium/palladium system is a promising option because of its high reactivity and ability to achieve complete dechlorination of DDE and DDD.