A Novel, Reactive Green Iron Sulfide (Sulfide Green Rust) Formed on Iron Oxide Nanocrystals

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• 作者：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
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：February 10, 2015
• 年：2015
• 卷：27
• 期：3
• 页码：700-707
• 全文大小：525K
• ISSN：1520-5002

文摘

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 M枚ssbauer spectroscopies indicated the presence of an iron(II)-rich phase with high sulfur content analogous to the iron鈥搊xygen 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.