Characterization of uranium(VI) sorption by organobentonite |
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| Authors: | Marek Majdan Stanis?aw Pikus Agnieszka G?adysz-P?aska Jerzy ?uk |
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| Institution: | a Faculty of Chemistry, Maria Curie Sk?odowska University, 20-031 Lublin, Poland
b Institute of Physics, Maria Curie Sk?odowska University, 20-031 Lublin, Poland |
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| Abstract: | The U(VI) sorption on the bentonite modified by hexadecyltrimethylammonium bromide (HDTMA) was studied in the concentration range: 0.0001-0.001 mol/dm3 in the aqueous phase and in the pH range: 3-10. The experiments concerning the pH influence on the molar absorption coefficient cb of U(VI) in the bentonite phase showed that the species: UO22+, UO2(OH)+, UO2(OH)2 UO2(OH)3−, UO2(OH)42−, (UO2)3(OH)5+, (UO2)3(OH)7−, present in the aqueous phase, are responsible for uranium sorption. Their sorption parameters K were determined and it is evident that for higher concentrations of HDTMA+ cations in the bentonite phase, i.e. for b96-b157 bentonite, the presence of anionic species: UO2(OH)3−, UO2(OH)42−, and (UO2)3(OH)7− in the aqueous phase results in the increase of U(VI) molar absorption coefficient cb in the sorbent phase. |
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| Keywords: | Uranium Sorption Organobentonite Hexadecyltrimethylammonium bromide |
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