Füllenbach, LC, Perez, JPH, Freeman, HM orcid.org/0000-0001-8242-9561 et al. (8 more authors) (2020) Nanoanalytical Identification of Siderite Dissolution-Coupled Pb Removal Mechanisms from Oxic and Anoxic Aqueous Solutions. ACS Earth and Space Chemistry, 4 (11). pp. 1966-1977. ISSN 2472-3452
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.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Keywords: | siderite; XANES-mapping; EXAFS; lead carbonate; iron oxyhydroxides; adsorption; wastewater treatment |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 24 Nov 2020 12:47 |
Last Modified: | 24 Nov 2020 12:47 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acsearthspacechem.0c00180 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:168252 |