We demonstrated the simultaneous enhancement of two properties of Prussian blue, Cs-adsorption performance and magnetization, using only thermal partial oxidation. The Cs-adsorption performance and magnetic properties of ammonium iron(III) hexacyanoferrate(II) (AFCF) n-hydrate, NH4Fe[Fe(CN)6]1−y·zH2O, were investigated before and after heating at 240 °C for 60 min. Both the distribution coefficient in Cs-adsorption, Kd, and the magnetic susceptibility were enhanced by as much as three times. The adsorption improvement is attributed to a partial structural change accompanying the increase of [Fe(CN)6] vacancies, whereas the change of 50% of Fe into the form of FeOx enhanced the susceptibility. The obtained magnetic adsorbent is applicable for Cs uptake from radioactive Cs wastewater using magnetic separation.
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Takahashi et al. (2014) studied this question.
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