Processes for removing, separating and concentrating lead, thallium,

Abstract

A method for the removal, separation, and concentration of alkali metal, alkaline earth metal, Pb and/or Tl cations from a source solution which may contain larger concentrations of other ions comprises bringing the source solution into contact with a compound comprising an oxygen donor macrocycle-containing ligand covalently bonded through an organic spacer silicon grouping to a solid inorganic support. The ligand portion(s) of the compound has affinity for alkali metal, alkaline earth metal, Pb and/or Tl thereby removing them from the source solution. The alkali metal, alkaline earth metal, Pb and/or Tl cations are then removed from the compound through contact with a much smaller volume of a receiving solution in which these cations are either soluble or which has greater affinity for such cations than does the oxygen donor macrocyclic ligand thereby quantitatively stripping the complexed cations from the ligand and recovering them in concentrated form in said receiving solution. The concentrated cations thus removed may be further separated and recovered by known methods. The process is useful in the removal of alkali metal, alkaline earth metal, Pb and Tl cations from a variety of source solutions such as from semiconductor, nuclear waste cleanup, metals refining, electric power, and other industrial enterprises. The invention is also drawn to the oxygen donor macrocycle-containing ligands covalently bonded through a spacer grouping to a hydrophilic inorganic solid support material.