Limitation of adsorptive penetration of cesium into Prussian blue crystallite

Abstract

The adsorption of cesium (Cs) onto Prussian blue (PB) with different crystallite sizes is investigated to examine the limitations of the adsorptive penetration of Cs ? into PB crystallite. The adsorption of Cs ? onto soluble PB occurs via ion exchange with a charge-compensation cation like K ? , which originally resides in the crystalline lattice. The ratio of the compensation cation sites that are replaced by Cs ? after adsorption time of 2 weeks significantly increases with decreasing crystallite size, meaning that the adsorption occurs only near the surface of the crystallite during the adsorption time. The depth of Cs ? penetration after 2 weeks is only within approximately 1-2 nm (or 1-2 units of the crystalline lattice) from the external surface of the crystallite at ambient temperature, regardless of the crystallite size. Hence, the crystallite size is the most important factor governing the adsorption performance.

Mechanochemically Synthesized Prussian Blue for Efficient Removal of Cesium Ions from Aqueous Solutions

“…The average crystallite size and lattice strain of PB_mechano and commercial PB were estimated according to the Williamson–Hall method (Table , Figure S1a). , The lattice strain induced in PB_mechano might be attributed to crystal imperfection and distortion resulted from the defect sites. The lattice constants of PB_mechano and commercial PB were also calculated as 1.015 and 1.020 nm, respectively, by the extrapolation method using the Nelson–Riley function (Table , Figure S1b).…”

Eco-friendly one-pot synthesis of Prussian blue-embedded magnetic hydrogel beads for the removal of cesium from water

“…Over 24 h was required for PB-MHBs-3 to reach adsorption equilibrium. The slower adsorption of PB-MHBs-3 may be attributed to the use of commercial PB, which is known to have slow kinetics due to limitations in diffusion 34 . However, 80% of the total amount of adsorbed Cs was adsorbed within a few hours of contact, as shown in Fig.…”

Interfacial Role of Cesium in Prussian Blue Films

“…On the one hand, a spontaneous and non-stoichiometric entrance where Cs atoms are located inside the porous of the zeolitic film 55 . In aim to maintain the electrical neutrality, the cesium cation must be accompanied by chloride anion.…”