title: Alumina-supported oxime for the degradation of sarin and diethylchlorophosphate.
abstract: 1-(4-Chlorophenyl))-N-hydroxymethanimine and cyclohexyl-N-hydroxymethanimine were synthesized and a well-established oxime, i.e., 2-[(hydroxyimino)methyl]-1-methylpyridinium chloride was purchased. Thereafter; all were loaded over Al(2)O(3) using incipient wetness technique. The prepared systems were characterized using surface area analyzer, scanning electron microscope, energy dispersive X-ray spectrophotometer, Fourier transform infrared spectrophotometer and thermogravimetric analyzer. Kinetics of the degradation of sarin (GB) and simulant, i.e. diethylchlorophosphate (DEClP) was studied over synthesized oxime impregnated Al(2)O(3) and results were compared with well reported oxime impregnated Al(2)O(3). Kinetics of reaction was found to be following the pseudo first order reaction kinetics. The order of reactivity of the prepared systems was found to be cyclohexyl-N-hydroxymethanimine/Al(2)O(3)>1-(4-chlorophenyl)-N-hydroxymethanimine/Al(2)O(3)>2-[(hydroxyimino)methyl]-1-methylpyridinium chloride/Al(2)O(3)>Al(2)O(3). From the reaction kinetics it was observed that the reaction with DEClP was faster than with GB. Cyclohexyl-N-hydroxymethanimine/Al(2)O(3) was found to be the most reactive system with half-life of 0.94 and 15 h for DEClP and GB respectively.
authors.affiliation: Defence Research and Development Establishment, Jhansi Road, Gwalior 474 002, MP, India.
authors.forename: Aniza K
authors.initials: AK
authors.lastname: Verma
authors.forename: Avanish K
authors.initials: AK
authors.lastname: Srivastava
authors.forename: Beer
authors.initials: B
authors.lastname: Singh
authors.forename: Dilip
authors.initials: D
authors.lastname: Shah
authors.forename: Smriti
authors.initials: S
authors.lastname: Shrivastava
authors.forename: Chandra Kant P
authors.initials: CK
authors.lastname: Shinde
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D002619:Chemical Warfare Agents / Q000032:analysis / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D009943:Organophosphorus Compounds / Q000032:analysis / Q000737:chemistry*; D010091:Oximes / Q000737:chemistry*; D012524:Sarin / Q000032:analysis / Q000737:chemistry*
chemical_list: D002619:Chemical Warfare Agents; D009943:Organophosphorus Compounds; D010091:Oximes; C548970:diethylchlorophosphate; D012524:Sarin; D000537:Aluminum Oxide