 | Clean Technology 2007
Technical Proceedings of the 2007 Clean Technology Conference and Trade Show
Chapter 8: Nanoparticle Processes & Applications |
| | Destruction of Organophosphate Agents by Recyclable Catalytic Magnetic Nanoparticles | | Authors: | L. Bromberg and T.A. Hatton | | Affilation: | Massachusetts Institute of Technology, US | | Pages: | 266 - 269 | | Keywords: | magnetite, oximate ion, catalysis, nerve agent decomposition | | Abstract: | Organophosphorus pesticides and warfare agents are not readily hydrolyzed in aqueous media without applying extremes of pH, heat, or bleach. We show that suspensions of magnetite (Fe3O4) nanoparticles modified with a common antidote, 2-pralidoxime (PAM), its polymeric analog, poly(4-vinylpyridine-N-phenacyloxime-co-acrylic acid), or poly(N-vinylimidazole-co-acrolein oxime-co-acrylic acid) (PImAA) catalyze the hydrolysis of organophosphate (OP) compounds such as diisopropyl fluorophosphate (DFP) or insecticide diethyl-p-nitrophenyl phosphate (paraoxon) serving as models of the warfare nerve agents, at neutral pH. The oxime-modified magnetite particle serves as a nano-sized particulate carrier with a powerful a-nucleophile, the oximate group, immobilized on its surface. The rates of OP hydrolysis by the PAM- or PImAA-modified magnetite are comparable to those of the most potent copper-based catalysts. The oxime-modified magnetite nanoparticles are colloidally stable at neutral pH and are readily recovered for reuse from the aqueous milieu by high-gradient magnetic separation methods with no loss of catalytic activity. |  | This paper is available to CTSI members in PDF© format. | | ISBN: | 1-4200-6382-0 |
| Pages: | 338 |
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