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Published on: June 28, 2019
Efficent removal of nickel(II) salts from aqueous solution using carboxymethylchitosan-coated silica particles as
Moumin Aden1, Rattiya Na Ubol2, Michael Knorr3
1Institut UTINAM, UMR CNRS 6213, Matériaux et Surfaces Structurés, Université Bourgogne Franche-Comté, 16 Route de Gray, 25030 Besançon, France; Faculté des Sciences, Université de Djibouti, Avenue Djanaleh, 1904, Djibouti.
Abstract:
Three types of organo-mineral composites have been probed as adsorbents for the removal of Ni(II) ions from aqueous solution. Native Aerosil 200 silica particles have been encapsulated with carboxymethylchitosan (CM-CS) providing SiO2+CM-CS, surface-silanized silica particles SiO2NH2+CM-CS were obtained by treatment with APTES and subsequent encapsulation by CM-CS. Alternatively, surface-carboxylated Aerosil 200 was coated by CM-CS affording SiO2CO2H+CM-CS. The materials have been characterized by various techniques. The effects of counter ions (Cl-, Br-, CH3COO-, NO3- and SO42-), pH and initial Ni(II) concentration on the adsorption capacities have been systematically investigated. The maximum adsorption capacity qm of CM-CS-coated silica was determined using the Langmuir adsorption isotherm. For SiO2CO2H+CM-CS, SiO2+CM-CS and SiO2NH2+CM-CS, they decrease at pH 7 in the order 256mg/g>140mg/g>105mg/g. The adsorption kinetic fits well with a pseudo-second order model. These carbohydrate-derived biosorbents are excellent adsorbents with capacities superior to most other adsorbents reported in the literature.
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