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Effect of sulphate, carbonate, and phosphate on the uranium(VI) sorption behaviour onto bentonite

Title data

Bachmaf, Samer ; Planer-Friedrich, Britta ; Merkel, Broder J.:
Effect of sulphate, carbonate, and phosphate on the uranium(VI) sorption behaviour onto bentonite.
In: Radiochimica Acta. Vol. 96 (2008) Issue 6 . - pp. 359-366.
ISSN 0033-8230
DOI: https://doi.org/10.1524/ract.2008.1496

Abstract in another language

Batch experiments were conducted to study the uranium U(VI) sorption onto bentonite as a function of pH (3 to 8), and initial U(VI) concentrations (5×10−6 and 5×10−5 M) in the presence and absence of sulfate, carbonate, and phosphate. Uranium sorption onto bentonite depended on the initial U(VI) concentration with a stronger sorption at lower concentrations and was high over a wide range of pH in the absence of complexing ligands. In the presence of 0.005M sulfate, U(VI) sorption was reduced at low pH values due to the competition between SO42− and the uranyl ion for sorption sites on the bentonite surface, or the formation of uranyl-sulfate complexes. In the presence of 0.003M carbonate, U(VI) sorption decreased sharply at a pH above 7, because of the formation of negatively charged uranyl-carbonate complexes, which are weakly adsorbed onto the bentonite. Uranium sorption onto bentonite was greatly enhanced in the presence of 0.003M phosphate. Kinetic batch experiments carried out for 5×10−5 M U(VI) at pH values of 3, 5, and 8 revealed that the sorption rate was generally rapid over the first 10 min of the experiments, then slowed down appreciably after 1 to 24 h. Sulfate had little effect on the kinetics of U(VI) sorption; both in the absence and presence of sulfate, sorption equilibrium was attained after 4 h. In the presence of carbonate, attainment of sorption equilibrium required more time than in its absence. The presence of 0.003M phosphate reduced the time required to reach sorption equilibrium across a wide range of pH compared to phosphate-free systems.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER80730
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group > Professorship Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 05 May 2015 12:10
Last Modified: 05 May 2015 12:10
URI: https://eref.uni-bayreuth.de/id/eprint/12819