Abstract
A new adsorbent was prepared by impregnation of nano-sized clinoptilolite by nickel hexacyanoferrate. The synthesized nano-adsorbent was changed to spherical beads by use of phenolsulphonic-formaldehyde resin. Techniques used to study the physicochemical properties of the adsorbent included Fourier transform infrared spectroscopy, X-ray diffraction, thermal methods (DTG-TGA), scanning electron microscopy, and energy dispersive X-ray spectroscopy. The adsorbent beads were used to remove Cs+ and Sr2+ from aqueous solutions in different experimental conditions. The maximum adsorption capacity of 171.3 and 70.5 mg g−1 were obtained for Cs+ and Sr2+ respectively. The adsorption data were examined with the Langmuir and Freundlich isotherm models. It was concluded that the data were best modelled by the Langmuir equation indicating monolayer sorption of Cs+ and Sr2+ on the surface of the nano-composite. The data were well described by the pseudo-second-order model. Thermodynamic parameters, selectivity and regeneration capability of the adsorbent were determined and discussed.
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