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Nanoanalytical identification of siderite dissolution-coupled Pb removal mechanisms from oxic and anoxic aqueous solutions

DOI: 10.1021/acsearthspacechem.0c00180 DOI Help

Authors: Lisa C. Fuellenbach (University College London (UCL)) , Jeffrey Paulo H. Perez (GFZ German Research Center for Geosciences) , Helen Freeman (GFZ German Research Centre for Geosciences; University of Leeds) , Andrew N. Thomas (Karlsruhe Institute of Technology) , Sathish Mayanna (GFZ German Research Center for Geosciences; Carl Zeiss Microscopy GmbH) , Julia E. Parker (Diamond Light Source) , Jörg Göttlicher (Karlsruhe Institute of Technology) , Ralph Steininger (Karlsruhe Institute of Technology) , Jörg Radnik (Federal Institute for Material Testing and Research (BAM)) , Liane G. Benning (GFZ German Research Center for Geosciences; Freie Universitaẗ Berlin) , Eric H. Oelkers (University College London (UCL))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Earth And Space Chemistry

State: Published (Approved)
Published: October 2020
Diamond Proposal Number(s): 21719

Abstract: Lead(II) is a toxic pollutant often found in metal-contaminated soils and wastewaters. In acidic aqueous environments, Pb(II) is highly mobile. Chemical treatment strategies of such systems therefore often include neutralization agents and metal sorbents. Since metal solubility and the retention potential of sorbents depend on the redox state of the aqueous system, we tested the efficiency of the naturally occurring redox-sensitive ferrous iron carbonate mineral siderite to remove Pb(II) from acidic aqueous solutions in batch experiments under oxic and anoxic conditions over a total of 1008 h. Siderite dissolution led to an increase in reactive solution pH from 3 to 5.3 and 6.9, while 90 and 100% of the initial aqueous Pb(II) (0.48 × 10–3 mol kg–1) were removed from the oxic and anoxic systems, respectively. Scanning and transmission electron microscopy, combined with X-ray absorption and photoelectron spectroscopy, indicated that under oxic conditions, Pb(II) was consumed by cerussite precipitation and inner-sphere surface complexation to secondary goethite. Under anoxic conditions, Pb(II) was removed by the rapid precipitation of cerussite. This efficient siderite dissolution-coupled sequestration of Pb(II) into more stable solid phases demonstrates this potential method for contaminated water treatment regardless of the redox environment.

Journal Keywords: siderite; XANES-mapping; EXAFS; lead carbonate; iron oxyhydroxides; adsorption; wastewater treatment

Subject Areas: Chemistry, Earth Science, Environment

Instruments: I14-Hard X-ray Nanoprobe

Added On: 02/11/2020 11:11

Discipline Tags:

Desertification & Pollution Earth Sciences & Environment Mineralogy Chemistry Inorganic Chemistry Geology

Technical Tags:

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