Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/196262
Type: Artigo de periódico
Title: Favorable Chitosan/cellulose Film Combinations For Copper Removal From Aqueous Solutions.
Author: Lima, Ilauro S
Lazarin, Angélica M
Airoldi, Claudio
Abstract: Three well-formed film combinations of chitosan, in the beta form and cellulose acetate biopolymer, having different proportions, have been synthesized and characterized by X-ray diffraction and infrared spectroscopy. The film having a 1.0/0.50 proportion presented 6.87 mmol of nitrogen atoms per gram of synthesized hybrid, with the highest affinity for adsorbing copper from aqueous solutions at 298+/-1K. The isotherm obtained in this adsorption showed a saturation plateau that corresponds to 1.92 mmol of copper per gram of hybrid. The energetic effects caused by copper ion interaction were determined through calorimetric titration at the solid-liquid interface in aqueous solution and gave a net thermal effect that enabled the calculation of the exothermic enthalpic values and the equilibrium constant. The complete thermodynamic data showed that the system is favored by exothermic enthalpies, negative Gibbs free energies and positive entropies.
Subject: Adsorption
Calorimetry
Carbon
Cellulose
Chitosan
Copper
Culture Techniques
Hot Temperature
Hydrogen
Ions
Macromolecular Substances
Models, Chemical
Models, Statistical
Nitrogen
Spectrophotometry
Spectrophotometry, Infrared
Temperature
Thermodynamics
Water
X-ray Diffraction
Rights: fechado
Identifier DOI: 10.1016/j.ijbiomac.2005.04.001
Address: http://www.ncbi.nlm.nih.gov/pubmed/15896840
Date Issue: 2005
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

Files in This Item:
File SizeFormat 
pmed_15896840.pdf187.82 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.