title: Extraction of chlorpyrifos and malathion from water by metal nanoparticles.
abstract: The nanoparticles of gold and silver in solution state and supported over activated alumina are effective systems for the quantitative removal of chlorpyrifos and malathion, two common pesticides found in surface waters of developing nations, from water. In the solution phase, these pesticides adsorb onto the nanoparticles' surfaces and upon interaction for a long time, the nanoparticles with adsorbed pesticides precipitate. In contrast, complete removal of these pesticides occurs when contaminated water is passed over nanoparticles supported on alumina. A prototype of an on-line filter was made using a column of activated alumina powder loaded with silver nanoparticles and the device was used for pesticide removal for extended periods. We believe that the method has great technological potential in drinking water purification, especially using silver nanoparticles.
authors.affiliation: DST Unit of Nanoscience, Department of Chemistry and Sophisticated Analytical Instrument Facility, Indian Institute of Technology Madras, Chennai 600036, India.
authors.forename: A Sreekumaran
authors.initials: AS
authors.lastname: Nair
authors.forename: T
authors.initials: T
authors.lastname: Pradeep
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D004390:Chlorpyrifos / Q000737:chemistry / Q000302:isolation & purification*; D003460:Crystallization / Q000379:methods; D046911:Macromolecular Substances / Q000737:chemistry; D008294:Malathion / Q000737:chemistry / Q000302:isolation & purification*; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods; D010316:Particle Size; D013499:Surface Properties; D014867:Water / Q000737:chemistry*; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D046911:Macromolecular Substances; D014873:Water Pollutants; D014867:Water; D004390:Chlorpyrifos; D000537:Aluminum Oxide; D008294:Malathion