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Type: Artigo de periódico
Title: Cellulose acetate-Al2O3 hybrid material coated with N-propyl-1,4-diazabicyclo [2.2.2] octane chloride. Preparation, characterization and study of some metal halides adsorption from ethanol solution
Author: Splendore, G
Benvenutti, EV
Kholin, YV
Gushikem, Y
Abstract: The preparation, characterization as well as the adsorption properties of MCln ( M= Fe( III), Co( II) and Cu( II)) from ethanol solutions by the new hybrid material cellulose acetate / Al2O3 coated with N- propyl- 1,4 diazabicyclo [ 2.2.2] octane chloride group are described. The diamine is bonded to the cellulose acetate / Al2O3 surface by Al - O - Si covalent bonds and thus, the material obtained is chemically very stable and shows high adsorption capacity in adsorbing MCln from ethanol solutions. When the material ( designated as σ- L+Cl-) comes into contact with the metal halide solutions, the salts diffuse into the substrate- solution interface as neutral species and are fixed in the form of the anionic complexes. The latter are held near the surface due to the electrostatic interactions with the positively charged centers ∼ L+. The adsorption capacities of the material ( t, in mmol g(-1)) and its affinities to the metal halides were determined by analyzing the adsorption isotherms with the help of the model of fixed polydentate centers. The constants of the adsorption equilibria ( β, in L mol(-1)) were used as the quantitative characteristics of affinity. For the FeCl3 adsorption equilibrium σ-L+ Cl- + FeCl3 β(11) σ-L+ [FeCl4](-) the specific concentration of the sorption centers t(σ-L+Cl-) is equal to 1.42 and log β(11) = 3.14. The adsorption of CoCl2 and CuCl2 ( MCl2) is described in a more complicated way: [GRAPHICS] The following values of parameters were obtained: t({σ- L+Cl -}2) = 0.20 and 0.115; log β(21) = 4.08 and 3.3 for CoCl2 and CuCl2 respectively.
Subject: N-propyl-1,4-diazabicyclo [2.2.2] octane chloride
Al2O3 coated cellulose acetate
chemically modified cellulose acetate
metal halide adsorption
heterogeneous equilibrium constant
Country: Brasil
Editor: Soc Brasileira Quimica
Citation: Journal Of The Brazilian Chemical Society. Soc Brasileira Quimica, v. 16, n. 2, n. 147, n. 152, 2005.
Rights: aberto
Identifier DOI: 10.1590/S0103-50532005000200004
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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