Selective sorption mechanism of Cs+ on potassium nickel hexacyanoferrate(II) compounds
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.
KeywordsKNiFC Ion exchange Cs+ Radioactive wastewater
This work was financially supported by the National Natural Foundation of China (11105073, 81101146), the Natural Science Foundation of Jiangsu Province (BK2011739, BK2011738, No. BK2012799) and the Ph.D. Programs Foundation of Ministry of Education of China (No. 2012321811008).
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