Characteristic of Prussian Blue Analogue Used in Caesium Adsorption and Study of Caesium Removal from Aqueous Solution

Abstract

Prussian blue (PB) and copper ferrocyanide (CF) were synthesized and characterized by XRD, SEM, XPS and N₂-BET. The basic adsorption behavior of caesium (Cs) onto these adsorbents were investigated. The adsorption isotherms was fitted by both Langmuir and Freundlich isotherm equations (particularly fitted to Langmuir equation for CF). The maximum adsorption capacity based on Langmuir equation was determined to be 296 mg/g for PB and 409 mg/g for CF. Moreover, to evaluate the efficiency of SiO₂ carried CF (CF-SiO₂) as novel adsorbent for Cs, the effect of interfering cations on the adsorption capacity of Cs⁺ was investigated in the presence of several competitive cations (i.e., Na⁺, K⁺, Mg²⁺) as well as PB and CF. In the present study, this adsorbent was tentatively applied to the removal of radioactive caesium (¹³⁷Cs). The adsorbent synthesized in this work can be an efficient adsorbent for Cs⁺.