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US 7,393,466 B2Granted
Compositions and methods for anion absorbent metal hydroxides
AssigneeApplied Intellecutal Capital, Inc.
InventorsRobert Lewis Clarke, Dean Butler
Life of this patent
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Abstract
A metal hydroxide complex has a formula Me(OH)4*A−*nH2O or MeO2*A−*nH2O. Preferred complexes are formed in an alkaline medium, and particularly especially preferred anions include cyanide and cyanide gold complexes. Contemplated complexes are formed on a metal hydroxide (e.g., hydrated zirconium, hafnium, and titanium hydroxide), which may be disposed in a porous container. Consequently, contemplated compounds may be used in methods of reducing the concentration of an anion in an alkaline medium.
Claims9
A method of reducing a concentration of an anion in an alkaline medium, comprising:
- providing an alkaline medium that includes an anion selected from the group consisting of cyanide and a cyanide metal complex;
- contacting the anion in the alkaline medium with a metal hydroxide, thereby forming a metal hydroxide complex of the formula Me(OH)4*A−*nH2O or MeO2*A−*nH2O, wherein Me is selected from the group consisting of zirconium, hafnium, and titanium;
- wherein Me is the metal, A− is the anion, and n is between 1 and 10,000;
- and removing the metal hydroxide complex from the alkaline medium.
1 more element
Dependencies are inferred from the claim text.