Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/76898
Type: Artigo de periódico
Title: Adsorption of FeCl3, CuCl2 and ZnCl2 on silsesquioxane 3-n-propylpyridiniumchloride polymer film adsorbed on Al2O3 coated silica gel
Author: Fujiwara, ST
Gushikem, Y
Alfaya, RVS
Abstract: Silesquioxane 3-n-propylpyridiniumchloride polymer (abbreviated as SiPyCl), was used to coat SiO2/Al2O3 substrate surface to form the chemically modified solid SiO2/Al2O3/SiPyCl having the specific surface area S-BET = 233 m(2) g(-1). The resulting polymer film was strongly adhered to the surface by means of =Al-O-Si bonding (where =Al stands for Al2O3 grafted on SiO2 surface) and presented an ion exchange capacity of 1.04 mmol g(-1). The metal halides, MCz [M = Fe(III), Cu(II) and Zn(II)], were adsorbed by the modified solid from ethanol solutions as neutral species by forming the surface anionic complexes described by the equation: mSiO(2)/Al2O3/SiPyCl + MClz reversible arrow (SiO2/Al2O3/SiPy (1))(m)[MClz+m](m-), where FeCl4-, ZnCl42- have tetrahedral and CuCl42- distorted tetrahedral symmetries. The equilibrium coefficients, K, determined for each complex species showed that SiO2/Al2O3/SiPyCl + has a high affinity for the metal ions. The following values expressed as log K were found: Cu = 3.0, Zn = 3.5 and Fe = 3.0. The material could efficiently preconcentrate these metal ions from an ethanol solutions and release them in aqueous solution. (C) 2001 Elsevier Science B.V. All rights reserved.
Subject: silsesquioxane 3-n-propylpyridiniumchloride polymer
silica-alumina
metal preconcentration
metal adsorption from ethanol
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S0927-7757(00)00685-3
Date Issue: 2001
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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