Abstract
Herein, the sorption behavior of potassium nickel hexacyanoferrate(II) (KNiFC) for Cs+ was investigated by sorption kinetics and isotherms. The results indicate sorption isotherms are well described by the Freundlich equation, sorption kinetics agree with pseudo-second-order kinetics, and rate limiting processes are controlled by film diffusion. The distribution coefficient of Cs+ (K d,Cs), decreased following the order: NH4 + > K+ > Na+ > Ca2+ > Mg2+, and declined with the increase of pH to a minimum value of 5.3 and then increased with the increase of pH. The selective sorption was closely related to hydrated radius, charge-radius, ionization potential and the structure of KNiFC.
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