US 2013/0274357 A1 · HYBRID ANION EXCHANGER IMPREGNATED WITH HYDRATED ZIRCONIUM OXIDE FOR SELECTIVE REMOVAL OF CONTAMINATING LIGAND AND METHODS OF MANUFACTURE AND USE THEREOF

Abstract

Polymeric anion exchanger are used as host materials in which sub-micron sized hydrated Zr(IV) oxides (HZrO) particles are irreversibly dispersed within the ion exchange medium, such as beads or fibers. The HZrO can be impregnated into the pore structure of resin by mixing the parent anion exchange resin with zirconium solution prepared by pre-calcined zirconium oxide dissolved in concentrated mixture of alcohol and acid, and then followed by precipitation of HZrO particles within the resin by using alkaline solution. Since the anion exchangers have positively charged such as quaternary ammonium functional groups, anionic ligands such as arsenate, fluoride can transport in and out of the gel phase without subjected to the Donnan exclusion effect. Consequently, anion exchanger-supported HZrO submicron particles exhibit significantly greater capacity to remove arsenic and fluoride in comparison with parent anon exchange resins. Known cation exchange resins as support materials do not offer high arsenic or fluoride removal capacity.

Claims21

Dependent claims

A method of preparing a hybrid anion exchange resin, the method comprising the steps of:

preparing a zirconium solution by dissolving zirconium oxide into a solution comprising an organic solvent and an acid;
bringing a polymeric anion exchange resin in contact with the zirconium solution to form a resin-zirconium material;
drying the resin-zirconium material;
subsequently contacting the dried resin-zirconium material with an aqueous alkaline solution to precipitate a zirconium compound within a gel phase of the anion exchange resin;
and
after the step of contacting, washing the anion exchange resin an aqueous wash liquid, followed by optionally rinsing with a non-aqueous rinse liquid, and then drying to yield a dried zirconium-impregnated anion exchange resin impregnated with at least one of a an oxygen-containing compound of zirconium, wherein the zirconium-impregnated anion exchange resin is suitable for use in removing at least one contaminant from a liquid, the contaminant selected from the group consisting of arsenate, arsenite, fluoride, phosphate, and selenite and combinations thereof.

3 more elements

Dependencies are inferred from the claim text.

Hybrid anion exchanger impregnated with hydrated zirconium oxide for selective removal of contaminating ligand and methods of manufacture and use thereof

Life of this patent

Hybrid anion exchanger impregnated with hydrated zirconium oxide for selective removal of contaminating ligand and methods of manufacture and use thereof

Life of this patent

Abstract

Claims21