Paper Details
Bibliographic Data:
Code: |
ZSBUS09 |
Paper Type: |
Article |
Author(s): |
Zeng H, Singh A, Basak B, Ulrich KU, Sahu M, Biswas P, Catalano JG, Giammar DE |
Title: |
Nanoscale Size Effects on Uranium(VI) Adsorption to Hematite |
Journal: |
Environmental Science & Technology
Volume: 43 Year: 2009 Pages: 1373-1378
ISSN-Print: 0013-936X |
Internal Storage: |
V3937 |
DOI: |
10.1021/es802334e |
Abstract: |
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). |
Comment: |
RAW_GRAPH (diagrammed raw data; percent adsorption vs pH) |
Surface Area
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Site Density / Protolysis
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Complex Formation
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Formatted Citation
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