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Potassium bismuthate rods was synthesized in a form of elongated rods in non-aqueous methanol medium. The material morphology and structure were investigated using energy dispersive spectroscopy, scanning electron microscopy, and X-ray diffraction. The effects of annealing temperature on the material morphology and structure were investigated. Sorption kinetic study and ionic selectivity was investigated using batch technique. The sorption of Ce 3+  on potassium bismuthate was found to be Ce 3+  cation’s ionic state selective process. Results showed that the chemical sorption of Ce 3+  ionic state in KBiO 3  follows the reduction of Bi 5+  to Bi 2−  as a result of the formation of cerium bismuthide(    Ce   2   3  +Bi    2  −O  2   )  .    $({\rm{Ce}}_2^{3 + }{\rm{B}}{{\rm{i}}^{2 - }}{{\rm{O}}_2}).$    The suggested chemo-sorption mechanism includes equilibration parallel processes of the released K +  to form K 2 CeO 2  and Bi 2 O 3  that consumes the original material. The sorption kinetic has two different orders depending on contact time, isotherms fits adequately with Freundlich model and Dubinin-Radushkevich model. The material is considered a candidate for lanthanides radioactivity removal from aqueous media for radioactive waste disposal processes.

Redox sorption of Ce(III)/Ce(IV) on potassium bismuthate