These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Nanogoethite formation from oxidation of Fe(II) sorbed on aluminum oxide: implications for contaminant reduction.
    Author: Larese-Casanova P, Cwiertny DM, Scherer MM.
    Journal: Environ Sci Technol; 2010 May 15; 44(10):3765-71. PubMed ID: 20408543.
    Abstract:
    Ferrous iron [Fe(II)] bound to mineral surfaces has been shown to reduce several important groundwater contaminants, but little is known of the nature of the newly formed, insoluble ferric iron [Fe(III)] and whether it influences the heterogeneous contaminant reduction process. To explore how the formation and evolution of the Fe oxidation products influences contaminant reduction, we measured the kinetics of nitrobenzene reduction by Fe(II) sorbed on alpha-Al(2)O(3) while simultaneously characterizing the Fe oxidation product with Mossbauer spectroscopy and electron microscopy. After a brief period of slow kinetics, the onset of nitrobenzene reduction coincided with a change in particle suspension color from white to yellow-ocher due to formation of nanogoethite rods (alpha-FeOOH) from oxidation of sorbed Fe(II). Formation of nanogoethite on the alpha-Al(2)O(3) particles appears to promote the rapid reduction of nitrobenzene. Our results show that nanogoethite crystals can form rapidly by heterogeneous Fe(II) oxidation, and formation of goethite can profoundly influence contaminant reduction rates by Fe(II).
    [Abstract] [Full Text] [Related] [New Search]