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Adsorption of palladium and platinum from aqueous solutions by chitosan and activated carbon coated with chitosan
Author(s) -
Sharififard Hakimeh,
Zokaee Ashtiani Farzin,
Soleimani Mansooreh
Publication year - 2012
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.1671
Subject(s) - palladium , adsorption , chitosan , platinum , activated carbon , freundlich equation , aqueous solution , chemistry , langmuir , inorganic chemistry , nuclear chemistry , catalysis , organic chemistry
In this work, the potential of chitosan and activated carbon coated with chitosan for palladium and platinum adsorption from aqueous solutions was investigated. The observed results showed that the optimum operating conditions for palladium and platinum adsorption on chitosan were initial pH 2, particle size of adsorbent = 0.21 mm and adsorbent dose = 10 g/L. Equilibrium studies showed that palladium and platinum adsorption on chitosan was of spontaneous and exothermic nature. Equilibrium results fitted with Langmuir, Freundlich, Temkin and Dubinin‐Radushkevich models for two adsorbents. The maximum adsorption capacities for palladium and platinum adsorption were 62.50 and 66.66 mg/g of chitosan and 43.48 and 52.63 mg/g of activated carbon coated with chitosan, respectively. Kinetic data were found to confirm pseudo‐second‐order kinetic model. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd.