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In this study, chitosan was crosslinked with glutaraldehyde and coated on the surface of cristobalite through a dip and phase inversion process. The adsorbent was used in batch experiments to evaluate the adsorption of Fe(III) and Cd(II) ions. A maximum adsorption capacity was observed at a glutaraldehyde concentration in sorbent preparation of 1% (w/w). The equilibrium adsorption quantity was determined to be a function of the solution pH, initial concentration and agitation period. Langmuir and Freundlich adsorption models were used to describe adsorption isotherms.

Comparative adsorption of Fe(III) and Cd(II) ions on glutaraldehyde crosslinked chitosan–coated cristobalite