A novel, reactive green iron sulfide (Sulfide Green Rust) formed on iron oxide nanocrystals

Christopher J. Jones, Soma Chattopadhyay, Natalia I. Gonzalez-Pech, Carolina Avendano, Nina Hwang, Seung Soo Lee, Minjung Cho, Andrew Ozarowski, Arjun Prakash, J. T. Mayo, Cafer Yavuz, Vicki L. Colvin

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Iron oxide nanocrystals are of great scientific and technological interest. In this work, these materials are the starting point for producing a reactive nanoparticle whose surface resembles that of natural green rusts. Treatment of iron oxide nanoparticles with cysteamine leads to the reduction of iron and the formation of a brilliant green aqueous solution of nanocrystals rich in iron(II). These materials remained crystalline with magnetic and structural features of the original iron oxide. However, new low-angle X-ray diffraction peaks as well as vibrational features characteristic of cysteamine were found in the nanocrystalline product. X-ray absorption spectroscopy (XAS), X-ray photoemission (XPS) and Mössbauer spectroscopies indicated the presence of an iron(II)-rich phase with high sulfur content analogous to the iron-oxygen structures found in natural green rusts. Electron microscopy found that these structural components remained associated with the nonreduced iron oxide cores. These sulfur-rich analogs of natural green rusts are highly reactive and were able to rapidly degrade a model organic dye in water. This observation suggests possible actuation with a cysteamine treatment of inert and magnetic iron oxide particles at the point-of-use for environmental remediation.
Original languageEnglish (US)
Pages (from-to)700-707
Number of pages8
JournalChemistry of Materials
Volume27
Issue number3
DOIs
StatePublished - Feb 10 2015
Externally publishedYes

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

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