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

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)
Files in This Item
There are no files associated with this item.
  • Hit : 149
  • Download : 0
  • Cited 0 times in thomson ci
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡClick to seewebofscience_button
⊙ Cited 1 items in WoSClick to see citing articles inrecords_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0