Removal of Ag ﴾I﴿ ions using potassium nickel hexacyanoferrate ion exchanger incapsulated barium alginate from aqueous solutions.

Document Type : Original Article

Authors

Chemistry Department, Faculty of Science, Benha, Egypt.

Abstract

Spherical beads of potassium nickel hexacyanoferrate ion exchanger incapsulated barium alginate (KNiHCF-Baalginate) have been prepared by ionotropic gelation of nickel chloride, potassium ferrocyanide with sodium alginate in
the presence of BaCl2 solution. The composition, properties and morphology of the resulting ion exchanger have been
characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), x-ray diffraction
(XRD) and thermogravimetric analysis (TGA). Batch technique was employed to examine the effects of different
parameters such as solution pH, concentration of metal ions, contact time and medium temperature on silver ion uptake.
The results indicated that the barium–alginate ion exchanger have high affinity towards silver ions. The ion exchange
data have been perfectly described by Freundlich isotherm rather than other isotherms such as Langmuir and Temkin.
Kinetics data have been analyzed using pseudo-first order, pseudo-second order and intra-particle diffusion equations.
The resulted showed that pseudo-second-order kinetic model was best fit with the obtained data. Also, thermodynamic
data proved the spontaneity of sorption process. Furthermore, the removal of silver ions using KNiHCF-Ba-alginate has
been studied using column technique as well.

Keywords

Journal of Basic and Environmental Sciences
Volume 5, Issue 4
October 2018
Pages 314-324

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