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Synthesis and application of modified chitosan beads for iron removal: kinetic and isotherm models
Author(s) -
CorreaMurrieta Ma. A.,
LópezCervantes Jaime,
SánchezMachado Dalia I.,
SánchezDuarte Reyna G.
Publication year - 2014
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.1841
Subject(s) - adsorption , freundlich equation , glutaraldehyde , langmuir , chitosan , chemistry , diffusion , langmuir adsorption model , kinetic energy , chromatography , nuclear chemistry , chemical engineering , thermodynamics , organic chemistry , physics , quantum mechanics , engineering
Chitosan beads (CBs) and glutaraldehyde cross‐linked chitosan beads (CGLBs) were used to investigate adsorption behavior of Fe (II/III) ions. Optimal adsorption conditions were determined by analyzing the solution pH, adsorption time, and adsorbent dosage. Kinetic studies were analyzed by using pseudo‐first‐order, pseudo‐second‐order, Elovich and intraparticle diffusion models. The equilibrium data were modeled by Langmuir, Redlich–Peterson, and Freundlich. The kinetic data were found to follow the pseudo‐first‐order and pseudo‐second‐order models. The equilibrium data were best modeled by Langmuir and Freundlich isotherms. The maximum adsorption capacities estimated from the Langmuir model were 90.49 mg Fe (III)/g CGLBs, 59.85 mg Fe (II)/g CBs, and 56.99 mg Fe (II)/g CGLBs. These last two results allow concluding that the cross‐linking slightly affected the adsorption capacity of pure chitosan, but the resulting beads are resistant to acidic medium using a small amount of glutaraldehyde and are a friendly alternative for the treatment of wastewater. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd.