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Title: Effects of humic substances on Fe(II) sorption onto aluminum oxide and clay

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCES
OSTI Identifier:
1419076
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geochemical Transactions; Journal Volume: 19; Journal Issue: 1
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Zhu, Ying, Liu, Jingjing, Goswami, Omanjana, Rouff, Ashaki A., and Elzinga, Evert J. Effects of humic substances on Fe(II) sorption onto aluminum oxide and clay. United States: N. p., 2018. Web. doi:10.1186/s12932-018-0048-5.
Zhu, Ying, Liu, Jingjing, Goswami, Omanjana, Rouff, Ashaki A., & Elzinga, Evert J. Effects of humic substances on Fe(II) sorption onto aluminum oxide and clay. United States. doi:10.1186/s12932-018-0048-5.
Zhu, Ying, Liu, Jingjing, Goswami, Omanjana, Rouff, Ashaki A., and Elzinga, Evert J. 2018. "Effects of humic substances on Fe(II) sorption onto aluminum oxide and clay". United States. doi:10.1186/s12932-018-0048-5.
@article{osti_1419076,
title = {Effects of humic substances on Fe(II) sorption onto aluminum oxide and clay},
author = {Zhu, Ying and Liu, Jingjing and Goswami, Omanjana and Rouff, Ashaki A. and Elzinga, Evert J.},
abstractNote = {},
doi = {10.1186/s12932-018-0048-5},
journal = {Geochemical Transactions},
number = 1,
volume = 19,
place = {United States},
year = 2018,
month = 1
}
  • We have studied the immobilization of Sb(III) and Sb(V) by Al-rich phases - hydrous Al oxide (HAO), kaolinite (KGa-1b), and oxidized and reduced nontronite (NAu-1) - using batch experiments to determine the uptake capacity and the kinetics of adsorption and Extended X-ray Absorption Fine Structure (EXAFS) Spectroscopy to characterize the molecular environment of adsorbed Sb. Both Sb(III) and Sb(V) are adsorbed in an inner-sphere mode on the surfaces of the studied substrates. The observed adsorption geometry is mostly bidentate corner-sharing, with some monodentate complexes. The kinetics of adsorption is relatively slow (on the order of days), and equilibrium adsorption isothermsmore » are best fit using the Freundlich model. The oxidation state of the structural Fe within nontronite affects the adsorption capacity: if the clay is reduced, the adsorption capacity of Sb(III) is slightly decreased, while Sb(V) uptake is increased significantly. This may be a result of the presence of dissolved Fe(II) in the reduced nontronite suspensions or associated with the structural rearrangements in nontronite due to reduction. These research findings indicate that Sb can be effectively immobilized by Al-rich phases. The increase in Sb(V) uptake in response to reducing structural Fe in clay can be important in natural settings since Fe-rich clays commonly go through oxidation-reduction cycles in response to changing redox conditions.« less
  • Natural (untreated) clays are most probably amorphous on their outermost surface layers due to the continuous and natural process of partial dissolution and reprecipitation of the clay components at the solid-aqueous interface. The pH-dependent adsorption on Al and Si oxides, mordenite, kaolinite, and montmorillonite of a humic acid (HA) and a fulvic acid (FA) was described as occurring on Al and Si sites. The surfaces of the clay minerals were modeled as mixtures of amorphous Al and Si oxides. The results showed a strong adsorption of the organics by the al sites on the Al oxide and kaolinite, and amore » weak adsorption of organics by the Si sites on the Si oxide, mordenite, and montmorillonite. At low pH values, the Si sites o the Si oxide, mordenite, and montmorillonite adsorbed FA; these latter observations strongly suggest that the adsorption of FA by the interplanar spaces of expanding clays is driven by forces that can be studied using amorphous Si oxide as the adsorbent. Multivalent cations will form organo-metallic complexes that significantly increase adsorption, particularly on Si sites; exceptions were found with some FA-metal complexes, which were attributed to the degree of complexation. The implication of these observations is that, in natural systems, the adsorption of aqueous compounds is highly dependent on the type of (amorphous) surface present at the outermost layer of the solid phase in contact with the liquid phase.« less