SORPTION OF EU ON NA- AND CA-MONTMORILLONITES: EXPERIMENTAL INVESTIGATIONS AND MODELLING WITH CATION EXCHANGE AND SURFACE COMPLEXATION
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dc.contributor.author | Bradbury M.H. | |
dc.contributor.author | Baeyens B. | |
dc.date.accessioned | 2021-04-19T02:32:53Z | |
dc.date.available | 2021-04-19T02:32:53Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1094201 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2002, 66, 13, 2325-2334 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28048 | |
dc.description.abstract | The 2-site protolysis no electrostatics surface complexation and cation exchange (2SPNE/CE) model used in previous work to model the sorption of Ni and Zn on Na- and Ca-montmorillonites was applied to sorption edges and isotherms measured for Eu on these two montmorillonite forms. The aim was to further test the applicability of the sorption model on a trivalent element with a more complex aqueous chemistry. An additional reason for choosing Eu was that it is considered to be a good chemical analogue for other lanthanides and trivalent actinides. With site types, site capacities, and protolysis constants fixed at the values in the Ni/Zn studies, all of the measured sorption edge data could be modelled using cation exchange and the monodentate surface species, =SSOEu2+, =SSOEuOH+ and =SSOEu(OH)3-, on the strong site type. However, an additional modelling study showed that the same data were almost equally well described by considering bidentate surface complexes, (=SSO)2Eu+ and (=SSO)2Eu(OH)2-, and cation exchange. To model the sorption isotherm measurements up to pH = 7.2, only one additional weak site surface complex was required, =SW1OEu2+ for the monodentate case and (=SW1O)2Eu+ for the bidentate case. Selectivity coefficients are given for Eu3+- Ca2+ and Eu3+- Na+ exchange on the planar sites and surface complexation constants for monodentate and bidentate Eu surface species on the edge sites of montmorillonite. | |
dc.title | SORPTION OF EU ON NA- AND CA-MONTMORILLONITES: EXPERIMENTAL INVESTIGATIONS AND MODELLING WITH CATION EXCHANGE AND SURFACE COMPLEXATION | |
dc.type | Статья |
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