| abstract |
A method comprises the step of spray-drying a solution or slurry comprising (alkali metal or ammonium) (metal) hexacyanoferrate particles wherein said metal is selected from Fe, Ru, Os, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, and Hg in a liquid to provide monodisperse, substantially spherical particles in a yield of at least 70 percent of theoretical yield and having an average particle size in the range of 1 to 500 micrometers, said particles being active towards Cs ions. The particles, which can be of a single salt or a combination of salts, can be used free flowing, in columns or beds, or entrapped in a nonwoven, fibrous web or matrix or a cast porous membrane, to selectively remove Cs ions from aqueous solutions. |