title: Extraction of heavy metals by 2-mercaptoethoxy groups attached to silica gel.
abstract: Silica gel is currently being used as a support for various straight chain mono- and bifunctional compounds such as amines, thiols (mercaptans), and mercaptoalochols. The current study reports the results of an investigation of a 2-mercaptoethoxy moiety covalently attached to silica gel. The condensation was effected by acid-catalyzed condensation of toluene solution of 2-mercaptoethanol and silica gel and azeotropically removing the water using a Dean-Stark tube. As a coordinating agent, this bifunctional compound was used in the removal of copper(II), cadmium(II), and lead(II) from standard aqueous solutions. Using silica gel support, the removal percentages were 91-93% for the three metals.
authors.affiliation: Department of Chemistry, Institute for Environmental Studies, University of South Florida, Tampa, Florida 33620, USA.
authors.forename: Craig A
authors.initials: CA
authors.lastname: Bowe
authors.forename: Dean F
authors.initials: DF
authors.lastname: Martin
mesh_terms: D002104:Cadmium / Q000737:chemistry / Q000302:isolation & purification*; D003300:Copper / Q000737:chemistry / Q000302:isolation & purification*; D007854:Lead / Q000737:chemistry / Q000302:isolation & purification*; D058428:Silica Gel; D012822:Silicon Dioxide / Q000737:chemistry; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D013438:Sulfhydryl Compounds; D002104:Cadmium; D007854:Lead; D058428:Silica Gel; D012822:Silicon Dioxide; D003300:Copper