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Abstract Title:

Uranium sorption on bentonite modified by octadecyltrimethylammonium bromide.

Abstract Source:

J Hazard Mater. 2010 Dec 15;184(1-3):662-70. Epub 2010 Aug 27. PMID: 20863617

Abstract Author(s):

Marek Majdan, Stanisław Pikus, Agnieszka Gajowiak, Dariusz Sternik, Emil Zięba

Article Affiliation:

Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, Poland. marek@hermes.umcs.lublin.pl

Abstract:

The sorption of U(VI) on octadecyltrimethyl-bentonite was investigated at the pH values of the aqueous phase ranging from 3 to 10 and the concentrations of U(VI): 0.1-1 mmol/dm(3). The concentrations of alkylammonium cation in bentonite were increased from 21% to 150% of CEC (cation exchange capacity). It was determined that the sorption of U(VI) on modified bentonite, i.e. the distribution constant -K(d) decreases with the percent of mineral modification until it attains a minimum at 76% of CEC and then increases again. The effective sorption of U(VI) was found to be in the pH range: 6-10 for the modified bentonite and was explained as the consequence of U(VI) anionic hydroxy complexes sorption. Both FT-IR and XRD spectra of the modified bentonite were analyzed and provided arguments for the existence of surfactant cations in the form of monolayer and bilayer in the interlamellar space of bentonite. In turn the luminescence spectra of bentonite suspensions, i.e. their character at different values of pH, proved the existence of hydroxide-like planar polymeric U(VI) species in the bentonite phase at pH 9.

Study Type : In Vitro Study
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