Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 43, Issue 5, Pages 1373-1378Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es802334e
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Funding
- National Science Foundation [BES 0608749]
- Center for Materials Innovation at Washington University
- Office of Science (BER)
- U.S. Department of Energy [DE-FG02-06ER64229, DE-AC02-06CH11357]
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U(VI) adsorption on aerosol-synthesized hematite particles ranging in size from 12 to 125 nm was studied to explore nanoscale size effects on uranium adsorption. Adsorption on 70 nm aqueous-synthesized particles was also investigated to examine the effect of the synthesis method on reactivity. Equilibrium adsorption was measured over pH 3-11 at two U(VI) loadings. Surface complexation modeling, combined with adjustment of adsorption equilibrium constants to be independent of site density and surface area, provided a quantitative reaction-based framework for evaluating adsorption affinity and capacity, Among the aerosol-synthesized particles, the adsorption affinity decreased as the particle size increased from 12 to 125 nm with similar intermediate affinities for 30 and 50 nm particles. X-ray absorption fine structure spectroscopy measurements suggest that the differences in adsorption affinity and capacity are not the result of substantially different coordination environments of adsorbed U(VI).
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