title: Study on soluble heavy metals with preconcentration by using a new modified oligosilsesquioxane sorbent.
abstract: In this work, a new modified oligosilsesquioxane was prepared, characterized and evaluated for its heavy metal adsorption characteristics from aqueous solution. The material was characterized using infrared spectroscopy, X-ray diffractometry, solid-state (29)Si and (13)C nuclear magnetic resonance. Batch and column experiments were conducted to investigate for Fe (III), Cr (III), Cu (II), Cd (II), Pb (II) and Ni (II) removal from dilute aqueous solution by sorption onto modified oligosilsesquioxane. The results obtained in the flow experiments, showed a recovery of ca. 100% of the metal ions adsorbed in a column packed with 2.0 g of nanomaterial, using 3 mL of 1.0 mol L(-1) HCl solution as eluent. The detection limits for Fe, Cr, Cu, Cd, Pb, and Ni were 0.26, 0.33, 0.38, 0.41, 0.47 and 0.55 μg L(-1), respectively. The relative standard deviation values (n=12) were <4.82% for Fe, <4.12% for Cr, <3.79% for Cu, <3.03% for Cd, <4.02% for Pb and <2.65% for Ni. The proposed method was successfully applied to the analysis of environmental samples.
authors.affiliation: Departamento de Física e Química, Unesp-Univ Estadual Paulista, Av. Brasil, 56-Centro, Caixa Postal 31, 15385-000 Ilha Solteira, SP, Brazil.
authors.forename: Eduardo G
authors.initials: EG
authors.lastname: Vieira
authors.forename: Isaac V
authors.initials: IV
authors.lastname: Soares
authors.forename: Newton L
authors.initials: NL
authors.lastname: Dias Filho
authors.forename: Niléia C
authors.initials: NC
authors.lastname: da Silva
authors.forename: Sérgio D
authors.initials: SD
authors.lastname: Perujo
authors.forename: Andréa C
authors.initials: AC
authors.lastname: Bastos
authors.forename: Edemir F
authors.initials: EF
authors.lastname: Garcia
authors.forename: Tamires T
authors.initials: TT
authors.lastname: Ferreira
authors.forename: Leonardo F
authors.initials: LF
authors.lastname: Fraceto
authors.forename: André H
authors.initials: AH
authors.lastname: Rosa
mesh_terms: D000327:Adsorption; D019216:Metals, Heavy / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D017646:Organosilicon Compounds / Q000737:chemistry*; D012995:Solubility; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D019216:Metals, Heavy; D017646:Organosilicon Compounds; D014874:Water Pollutants, Chemical