Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/197351
Type: Artigo de periódico
Title: N-propylpyridinium Chloride-modified Poly(dimethylsiloxane) Elastomeric Networks: Preparation, Characterization, And Study Of Metal Chloride Adsorption From Ethanol Solutions.
Author: Pissetti, Fábio L
Magosso, Herica A
Yoshida, Inez V P
Gushikem, Yoshitaka
Myernyi, Sergiy O
Kholin, Yuriy V
Abstract: An n-propylpyridinium chloride-modified PDMS elastomeric network, PDMS/Py(+)Cl(-), was prepared from linear PDMS chains containing Si(CH(3))(2)OH end-groups cross-linked by 3-chloropropyltrimethoxysilane and posterior reaction with pyridine. PDMS/Py(+)Cl(-) material was structurally characterized by infrared spectroscopy (IR) and solid state (13)C and (29)Si NMR. Thermogravimetric analysis of the product showed good thermal stability, with the initial temperature of weight loss at 450 K. The ion-exchange capacity of the PDMS/Py(+)Cl(-) was 0.65 mmol g(-1). Metal halides, MCl(z) [M=Fe(3+), Cu(2+), and Co(2+)], were adsorbed by the modified solid from ethanol solutions as neutral species by forming the surface anionic complexes MCl(z+n)(n-). The nature of the anionic complex structure was proposed by UV-vis diffuse reflectance spectra. The species adsorbed were FeCl(-)(4), CuCl(2-)(4), and CoCl(2-)(4). The specific sorption capacities and the heterogeneous stability constants of the immobilized metal complexes were determined with the aid of computational procedures. The trend in affinities of PDMS/Py(+)Cl(-) for the metal halides were found to be FeCl(3)>CuCl(2) approximately CoCl(2).
Subject: Adsorption
Dimethylpolysiloxanes
Ethanol
Hydrocarbons, Chlorinated
Metals
Models, Chemical
Molecular Conformation
Pyridinium Compounds
Solutions
Spectrophotometry, Ultraviolet
Rights: fechado
Identifier DOI: 10.1016/j.jcis.2007.05.040
Address: http://www.ncbi.nlm.nih.gov/pubmed/17582428
Date Issue: 2007
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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