Measurement
and Surface Complexation Modeling of U(VI)
Adsorption to Engineered Iron Oxide Nanoparticles
Version 2 2017-07-27, 18:23
Version 1 2017-07-27, 18:23
Posted on 2017-07-27 - 18:23
Surface-functionalized
magnetite nanoparticles have high capacity
for U(VI) adsorption and can be easily separated from the aqueous
phase by applying a magnetic field. A surface-engineered bilayer structure
enables the stabilization of nanoparticles in aqueous solution. Functional
groups in stearic acid (SA), oleic acid (OA), and octadecylphosphonic
acid (ODP) coatings led to different adsorption extents (SA≈
OA > ODP) under the same conditions. The impact of water chemistry
(initial loading of U(VI), pH, and the presence of carbonate) has
been systematically examined for U(VI) adsorption to OA-coated nanoparticles.
A diffuse double layer surface complexation model was developed for
surface-functionalized magnetite nanoparticles that could simulate
both the measured surface charge and the U(VI) adsorption behavior
at the same time. With a small set of adsorption reactions for uranyl
hydroxide and uranyl carbonate complexes to surface sites, the model
can successfully simulate the entire adsorption data set over all
uranium loadings, pH values, and dissolved inorganic carbon concentrations.
The results show that the adsorption behavior was related to the changing
U(VI) species and properties of surface coatings on nanoparticles.
The model could also fit pH-dependent surface potential values that
are consistent with measured zeta potentials.
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Pan, Zezhen; Li, Wenlu; Fortner, John D.; Giammar, Daniel E. (2017). Measurement
and Surface Complexation Modeling of U(VI)
Adsorption to Engineered Iron Oxide Nanoparticles. ACS Publications. Collection. https://doi.org/10.1021/acs.est.7b01649
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AUTHORS (4)
ZP
Zezhen Pan
WL
Wenlu Li
JF
John D. Fortner
DG
Daniel E. Giammar
KEYWORDS
surface-functionalized magnetite nanoparticleslayer surface complexation modelresults showuranium loadingssurface-engineered bilayer structurestearic acidsurface chargeEngineered Iron Oxide Nanoparticles Surface-functionalized magnetite nanoparticlesadsorption extentssurface coatingsFunctional groupsODPcarbon concentrationsadsorption reactionsadsorption datapH-dependent surfacezeta potentialsSAwater chemistryuranyl carbonate complexesadsorption behavioroctadecylphosphonic aciduranyl hydroxidepH valuesSurface Complexation Modelingsurface sitesOA-coated nanoparticles