Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 105, Issue 10, Pages 3696-3699Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0711528105
Keywords
chalcogenide; environmental remediation; ion exchange; layered materials; nuclear waste
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In this article, we report the family of robust layered sulfides K2xMnxSn3-xS6 (x = 0.5-0.95) (KMS-1). These materials feature hexagonal [MnxSn3-xS6](2x-) slabs of the Cdl(2) type and contain highly mobile K+ ions in their interlayer space that are easily exchangeable with other cations and particularly strontium. KMS-1 display outstanding preference for strontium ions in highly alkaline solutions containing extremely large excess of sodium cations as well as in acidic environment where most alternative adsorbents with oxygen ligands are nearly inactive. The implication of these results is that simple layered sulfides should be considered for the efficient remediation of certain nuclear wastes.
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