title: Removal of sulphur mustard, sarin and simulants on impregnated silica nanoparticles.
abstract: Silica nanoparticles of diameter, 24-75 nm and surface area, 875 m(2)/g were synthesized using aero-gel route. Thereafter, nanoparticles were impregnated with reactive chemicals, and used as reactive adsorbent to study the removal of toxic nerve and blister chemical warfare agents and their simulants from solutions. Trichloroisocyanuric acid impregnated silica nanoparticles showed the best performance and indicated physisorption followed by chemisorption/degradation of toxicants. This indicated their suitability as universal decontaminant for nerve and blister agents. This system showed a decrease in t(1/2) from 1210 to 2.8 min for the removal of king of chemical warfare agents, i.e., sulphur mustard. Hydrolysis, dehydrohalogenation and oxidation reactions were found to be the route of degradation of toxicants over impregnated silica nanoparticles.
authors.affiliation: Centre for Fire Explosive & Environment Safety, Timarpur, Delhi 110054, India. amsa888@rediffmail.com
authors.forename: Amit
authors.initials: A
authors.lastname: Saxena
authors.forename: Avanish K
authors.initials: AK
authors.lastname: Srivastava
authors.forename: Beer
authors.initials: B
authors.lastname: Singh
authors.forename: Anshu
authors.initials: A
authors.lastname: Goyal
mesh_terms: D000327:Adsorption; D002619:Chemical Warfare Agents / Q000737:chemistry*; D003666:Decontamination / Q000379:methods; D004785:Environmental Pollutants / Q000737:chemistry*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009151:Mustard Gas / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D016062:Porosity; D012524:Sarin / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D014227:Triazines / Q000737:chemistry
chemical_list: D002619:Chemical Warfare Agents; D004785:Environmental Pollutants; D014227:Triazines; C557580:trichloroisocyanuric acid; D012822:Silicon Dioxide; D012524:Sarin; D009151:Mustard Gas