A cubic compound may comprise thorium borate or, in the alternative cerium borate, and may possess a porous supertetrahedral cationic framework with extraframework borate anions. These anions are readily exchanged with a variety of environmental contaminants, especially those from the nuclear industry, including chromate and pertechnetate.
STATEMENT REGARDING FEDERALLY SPONSORED R&D
 This invention was made with government support under the United States Department of Energy and under Contract Nos. DE-FG02-01ER15187, DE-FG02-01ER16026, and DE-SC0001089. The government has certain rights in the invention.