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Type: Artigo de periódico
Title: Determination of the constants of affinity of FeCl3, CuCl2, and ZnCl2 for a nitrogen-containing organosilane bonded on Al2O3-cellulose acetate hybrid material surface from ethanol solution
Author: Lazarin, AM
Landers, R
Kholin, YV
Gushikem, Y
Abstract: This work describes the preparation and characterization of a cellulose acetate fiber coated with Al2O3, resulting in the organic-inorganic hybrid Cel/Al2O3. Furthermore, the hybrid was modified by attaching organofunctional groups by reaction with the precursor reagents (RO)(3)Si(CH2)(3)L (L = NH2, NH(CH2)(2)NH2, NH(CH2)(2)NH(CH2)(2)NH2, and N2C3H3 (imidazole)), resulting in Cel/Al2O3/Si(CH2)(3)NH2 (1), Cel/Al2O3/Si(CH2)(3)NH(CH2)(2)NH2 (2), Cel/Al2O3/Si(CH2)(3)NH(CH2)(2)NH(CH2)(2)NH2 (3), and Cel/ Al2O3/Si(CH2)(3)N2C3H3 (4). The amounts of attached organofunctional groups were (in mmol per gram of the material) 1 = 1.90, 2 = 1.89, 3 = 1.66, and 4 = 1.35. The isotherms of adsorption of FeCl3, CuCl2, and ZnCl2 by Cel/Al2O3/Si(CH2)(3)L from ethanol solutions were obtained at 298 K. Accurate estimates of the specific sorption capacities and the heteregeneous stability constants of the immobilized metal complexes were determined with the aid of several computational procedures. It is shown that the sorptional capacities are much less than the concentrations of the attached organofunctional groups. As all sorption isotherms are fitted properly with the Langmuir isotherm equation, the effects of the energetic heterogeneity and the lateral interactions do not affect the chemisorption equilibria. The heterogeneous stability constants of the immobilized complexes are fairly high, which provides efficient removal of the metal ions from solutions by the hybrid materials. (C) 2002 Elsevier Science (USA).
Subject: cellulose acetate fiber
organofunctional groups
metal halide
adsorption isotherms
affinity constants in ethanol solutions
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Identifier DOI: 10.1006/jcis.2002.8552
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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