Chitosan-based biosorbents: immobilization of metal hexacyanoferrates and application for removal of cesium radionuclide from aqueous solutions
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Composite M (M—Cu, Ni) potassium ferrocyanide chitosan-based materials were prepared via co-precipitation methods using chitosan as a matrix for adsorption of cesium from alkaline solutions. The materials were fabricated using a suspension or in situ formation of ferrocyanides of transition metals in a chitosan matrix with simultaneous chitosan deposition. The synthesis products were characterized by the methods of scanning electron microscopy with energy-dispersive analysis (SEM–EDX) and X-ray diffraction (XRD). In the process of sorption of radiocesium from alkaline solutions under static conditions, the stability of composite sorbents compared with the pristine powders of transition metal ferrocyanides was estimated. The boundary values of the pH and time, at which the destruction of the composite sorbent is observed, are determined. The stabilizing effect of chitosan on the resistance of Ni-K ferrocyanide (FCN) complexes in alkaline mineralized solutions has been shown on the example of Ni-K FCN/chitosan composite sorbents.
Composite sorption materials have been fabricated by the methods of co-precipitation of chitosan and hexacyanoferrates of transition metals (Ni and Cu).
The synthesis products were characterized by the methods of scanning electron microscopy with energy-dispersive analysis (SEM–EDX) and XRD.
Sorbents were tested for cesium removal from model mineralized alkaline solutions.
KeywordsOrganomineral composites Sorbent Chitosan Metal hexacyanoferrate Cesium Radionuclide
The work was partially supported by the FEBRAS Program of Basic Research “Far East”, project no. 18–3–021.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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