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In situ arsenic oxidation and sorption by a Fe-Mn binary oxide waste in soil

DOI: 10.1016/j.jhazmat.2017.08.066 DOI Help

Authors: Clare M. Mccann (Newcastle University) , Caroline L. Peacock (University of Leeds) , Karen A. Hudson-Edwards (Birkbeck, University of London) , Thomas Shrimpton (Newcastle University) , Neil D. Gray (Newcastle University) , Karen L. Johnson (Durham University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Hazardous Materials

State: Published (Approved)
Published: August 2017
Diamond Proposal Number(s): 7737

Abstract: The ability of a Fe-Mn binary oxide waste to adsorb arsenic (As) in a historically contaminated soil was investigated. Initial laboratory sorption experiments indicated that arsenite [As(III)] was oxidized to arsenate [As(V)] by the Mn oxide component, with concurrent As(V) sorption to the Fe oxide. The binary oxide waste had As(III) and As(V) adsorption capacities of 70 mg g−1 and 32 mg g−1 respectively. X-ray Absorption Near-Edge Structure and Extended X-ray Absorption Fine Structure at the As K-edge confirmed that all binary oxide waste surface complexes were As(V) sorbed by mononuclear bidentate corner-sharing, with 2 Fe at ∼3.27 Ǻ. The ability of the waste to perform this coupled oxidation-sorption reaction in real soils was investigated with a 10% by weight addition of the waste to an industrially As contaminated soil. Electron probe microanalysis showed As accumulation onto the Fe oxide component of the binary oxide waste, which had no As innately. The bioaccessibility of As was also significantly reduced by 7.80% (p < 0.01) with binary oxide waste addition. The results indicate that Fe-Mn binary oxide wastes could provide a potential in situ remediation strategy for As and Pb immobilization in contaminated soils.

Journal Keywords: Arsenic; Fe-Mn binary oxide; remediation; soil; lead

Subject Areas: Earth Science, Environment, Chemistry

Instruments: B18-Core EXAFS

Added On: 06/09/2017 10:36

Discipline Tags:

Inorganic Chemistry Earth Sciences & Environment Desertification & Pollution Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS) X-ray Absorption Near Edge Structure (XANES)