Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5357883 | Applied Surface Science | 2010 | 6 Pages |
Abstract
The U(VI) sorption on the bentonite modified by hexadecyltrimethylammonium bromide (HDTMA) was studied in the concentration range: 0.0001-0.001Â 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)3â, UO2(OH)42â, (UO2)3(OH)5+, (UO2)3(OH)7â, 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)3â, UO2(OH)42â, and (UO2)3(OH)7â in the aqueous phase results in the increase of U(VI) molar absorption coefficient cb in the sorbent phase.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Marek Majdan, StanisÅaw Pikus, Agnieszka Gajowiak, Agnieszka GÅadysz-PÅaska, Halina Krzyżanowska, Jerzy Å»uk, Monika Bujacka,