Abstract
The U(VI) sorption on the bentonite modified by hexadecyltrimethylammonium bromide (HDTMA) was studied in the concentration range: 0.0001–0.001 mol/dm 3 in the aqueous phase and in the pH range: 3–10. The experiments concerning the pH influence on the molar absorption coefficient c b of U(VI) in the bentonite phase showed that the species: UO 2 2+, UO 2(OH) +, UO 2(OH) 2 UO 2(OH) 3 −, UO 2(OH) 4 2−, (UO 2) 3(OH) 5 +, (UO 2) 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: UO 2(OH) 3 −, UO 2(OH) 4 2−, and (UO 2) 3(OH) 7 − in the aqueous phase results in the increase of U(VI) molar absorption coefficient c b in the sorbent phase.
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