Competitive and Cooperative Effects during Nickel Adsorption to Iron Oxides in the Presence of Oxalate
Abstract
Iron oxides are ubiquitous in soils and sediments and play a critical role in the geochemical distribution of trace elements and heavy metals via adsorption and coprecipitation. The presence of organic acids may potentially alter how metals associate with iron oxide minerals through a series of cooperative or competitive processes: solution complexation, ternary surface complexation, and surface site competition. The macroscopic and molecular-scale effects of these processes were investigated for Ni adsorption to hematite and goethite at pH 7 in the presence of oxalate. The addition of this organic acid suppresses Ni uptake on both minerals. Aqueous speciation suggests that this is dominantly the result of oxalate complexing and solubilizing Ni. Comparison of the Ni surface coverage to the concentration of free (uncomplexed) Ni2+ in solution suggests that the oxalate also alters Ni adsorption affinity. EXAFS and ATR-FTIR spectroscopies indicate that these changes in binding affinity are due to the formation of Ni–oxalate ternary surface complexes. Here, these observations demonstrate that competition between dissolved oxalate and the mineral surface for Ni overwhelms the enhancement in adsorption associated with ternary complexation. Oxalate thus largely enhances Ni mobility, thereby increasing micronutrient bioavailability and inhibiting contaminant sequestration.
- Authors:
-
- Washington Univ., St. Louis, MO (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1379430
- Grant/Contract Number:
- DGE-1745038; AC02-06CH11357; ECS-0335765
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Environmental Science and Technology
- Additional Journal Information:
- Journal Volume: 51; Journal Issue: 17; Journal ID: ISSN 0013-936X
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 54 ENVIRONMENTAL SCIENCES; anions; complexation; hematite; adsorption; minerals
Citation Formats
Flynn, Elaine D., and Catalano, Jeffrey G. Competitive and Cooperative Effects during Nickel Adsorption to Iron Oxides in the Presence of Oxalate. United States: N. p., 2017.
Web. doi:10.1021/acs.est.7b02657.
Flynn, Elaine D., & Catalano, Jeffrey G. Competitive and Cooperative Effects during Nickel Adsorption to Iron Oxides in the Presence of Oxalate. United States. https://doi.org/10.1021/acs.est.7b02657
Flynn, Elaine D., and Catalano, Jeffrey G. Mon .
"Competitive and Cooperative Effects during Nickel Adsorption to Iron Oxides in the Presence of Oxalate". United States. https://doi.org/10.1021/acs.est.7b02657. https://www.osti.gov/servlets/purl/1379430.
@article{osti_1379430,
title = {Competitive and Cooperative Effects during Nickel Adsorption to Iron Oxides in the Presence of Oxalate},
author = {Flynn, Elaine D. and Catalano, Jeffrey G.},
abstractNote = {Iron oxides are ubiquitous in soils and sediments and play a critical role in the geochemical distribution of trace elements and heavy metals via adsorption and coprecipitation. The presence of organic acids may potentially alter how metals associate with iron oxide minerals through a series of cooperative or competitive processes: solution complexation, ternary surface complexation, and surface site competition. The macroscopic and molecular-scale effects of these processes were investigated for Ni adsorption to hematite and goethite at pH 7 in the presence of oxalate. The addition of this organic acid suppresses Ni uptake on both minerals. Aqueous speciation suggests that this is dominantly the result of oxalate complexing and solubilizing Ni. Comparison of the Ni surface coverage to the concentration of free (uncomplexed) Ni2+ in solution suggests that the oxalate also alters Ni adsorption affinity. EXAFS and ATR-FTIR spectroscopies indicate that these changes in binding affinity are due to the formation of Ni–oxalate ternary surface complexes. Here, these observations demonstrate that competition between dissolved oxalate and the mineral surface for Ni overwhelms the enhancement in adsorption associated with ternary complexation. Oxalate thus largely enhances Ni mobility, thereby increasing micronutrient bioavailability and inhibiting contaminant sequestration.},
doi = {10.1021/acs.est.7b02657},
journal = {Environmental Science and Technology},
number = 17,
volume = 51,
place = {United States},
year = {Mon Jul 31 00:00:00 EDT 2017},
month = {Mon Jul 31 00:00:00 EDT 2017}
}
Web of Science
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