Equilibrium and kinetics of calcium–uranyl–carbonate adsorption on silica nanoparticles

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The present work focuses on studying U(VI) adsorption to silica nanoparticles at neutral to weakly alkaline pH and in the presence of calcium and carbonate ions, i.e. when calcium-uranyl-carbonate complexes dominate aqueous U(VI) speciation. The adsorption behavior was studied in batch experiments under various experimental conditions such as solid:liquid ratio, contact time, pH, and varying concentrations of U(VI). The U(VI) distribution ratio (R-d) decreases from 32.2 to 3.2 L g(-1) as the pH increases from 7.1 to 8.6, due to the increase in concentration of Ca(UO2)(CO3)(3)(2-) and UO2(CO3)(3)(4-) complexes in solution. Under the experimental conditions, the adsorption data are best fitted to the Langmuir isotherm and the adsorption capacity (q(m)) is 51.39 +/- 2.89 mg g(-1). On the other side, the U(VI) adsorption follows the pseudo-second-order rate equation which suggests that the adsorption is of chemisorption type.
Publisher
SPRINGER
Issue Date
2017-10
Language
English
Article Type
Article
Keywords

INDUCED FLUORESCENCE SPECTROSCOPY; URANIUM(VI) SORPTION; U(VI) SORPTION; OPALINUS CLAY; HUMIC-ACID; COMPLEXES; CHEMISORPTION; SPECIATION; HEMATITE; WATERS

Citation

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, v.314, no.1, pp.93 - 103

ISSN
0236-5731
DOI
10.1007/s10967-017-5395-7
URI
http://hdl.handle.net/10203/226720
Appears in Collection
NE-Journal Papers(저널논문)
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