title: Determination of kinetic parameters of Cu(II) interaction with chemically modified thin chitosan membranes.
abstract: In this work, vanillin-modified thin chitosan membranes were utilized as adsorbents for the removal of Cu(II) from aqueous solutions. A rise of temperature accelerates mass transfer of Cu(II) to the membranes surfaces. The kinetic data did present a rough fit to the traditional Lagergren adsorption kinetic equations. An alternative Avrami kinetic equation was successfully fitted to the kinetic adsorption quantities. From this new equation, from one to three regions presenting distinct kinetic parameters were found, and the use of the parameter n was also related to the determination of the kinetic orders. Variations of the adsorption rate in relation to the contact time and the temperature were also calculated and are discussed.
authors.affiliation: Laboratory of Materials and Calorimetry, Departamento de Química/CCET, Universidade Federal de Sergipe, 49100-000 São Cristóvão, Sergipe, Brazil. cestari@ufs.br
authors.forename: Antonio R
authors.initials: AR
authors.lastname: Cestari
authors.forename: Eunice F S
authors.initials: EF
authors.lastname: Vieira
authors.forename: Joana D S
authors.initials: JD
authors.lastname: Matos
authors.forename: Débora S C
authors.initials: DS
authors.lastname: dos Anjos
mesh_terms: D002236:Carbohydrate Conformation; D048271:Chitosan / Q000737:chemistry*; D003300:Copper; D007700:Kinetics; D008567:Membranes, Artificial; D008958:Models, Molecular; D013816:Thermodynamics
chemical_list: D008567:Membranes, Artificial; D003300:Copper; D048271:Chitosan