Patent ID: 7122502

Claim:
A water decontamination medium comprising: sorbent material that binds anionic species in water, selected from the group consisting of species including chromium and species including arsenic, predominantly through a formation of surface complexes, wherein said sorbent material comprises a composition of formula (AB 2 X 4 ) n wherein: A is a divalent cation selected from the group consisting of Co 2+ , Cu 2+ , Mg 2+ , Ni 2+ , and Zn 2+ ; B is a trivalent cation selected from the group consisting of Al 3+ , Bi 3+ , Co 3+ , Cr 3+ , Fe 3+ , Mn 3+ , Ni 3+, and V 3+ ; X is an anion species selected from the group consisting of oxygen and sulfur; and n is at least one.