Nanoscale size effects on uranium(VI) adsorption to hematite

Hui Zeng, Abhas Singh, Soubir Basak, Kai Uwe Ulrich, Manoranjan Sahu, Pratim Biswas, Jeffrey G. Catalano, Daniel E. Giammar

Research output: Contribution to journalArticlepeer-review

133 Scopus citations

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).

Original languageEnglish (US)
Pages (from-to)1373-1378
Number of pages6
JournalEnvironmental Science and Technology
Volume43
Issue number5
DOIs
StatePublished - Mar 1 2009
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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