Incorporation of monovalent cations in sulfate green rust

B.C. Christiansen, K. Dideriksen, A. Katz, S. Nedel, N. Bovet, H.O. Sørensen, C. Frandsen, C. Gundlach, M.P. Andersson, S.L.S. Stipp

Research output: Contribution to journalArticleResearchpeer-review

25 Citations (Scopus)


Green rust is a naturally occurring layered mixed-valent ferrous-ferric hydroxide, which can react with a range of redox-active compounds. Sulfate-bearing green rust is generally thought to have interlayers composed of sulfate and water. Here, we provide evidence that the interlayers also contain monovalent cations, using X-ray photoelectron spectroscopy and synchrotron X-ray scattering. For material synthesized with Na+, K+, Rb+, or Cs+, interlayer thickness derived from basal plane spacings correlates with the radius of the monovalent cation. In addition, sequential washing of the materials with water showed that Na+ and K+ were structurally fixed in the interlayer, whereas Rb+ and Cs+ could be removed, resulting in a decrease in the basal layer spacing. The incorporation of cations in the interlayer opens up new possibilities for the use of sulfate green rust for exchange reactions with both anions and cations: e.g., radioactive Cs.

Original languageEnglish
Pages (from-to)8887-8894
Number of pages8
JournalInorganic Chemistry
Issue number17
Publication statusPublished - 2 Sept 2014
Externally publishedYes

Programme Area

  • Programme Area 2: Water Resources


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