Cesium uptake from aqueous solutions by bentonite: A comparison of multicomponent sorption with ion-exchange models
| dc.contributor.author | Klika, Zdeněk | |
| dc.contributor.author | Kraus, Lukáš | |
| dc.contributor.author | Vopálka, Dušan | |
| dc.date.accessioned | 2007-03-02T12:48:50Z | |
| dc.date.available | 2007-03-02T12:48:50Z | |
| dc.date.issued | 2007 | |
| dc.description.abstract-en | The removal of cesium from concentrated aqueous solutions into Ca/Mg-bentonite for a wide range of bentonite-to-water (m/V) ratios was studied experimentally and theoretically. Using the batch technique, the equilibrium of Cs uptake was measured. The nonlinear character of cesium sorption substantially influenced by the m/V ratio was observed. The experimental data were evaluated using the multicomponent Langmuir isotherm and an ion-exchange model based on the ion-exchange reaction between Cs+ and M2+ (Ca2+/Mg2+) initially sorbed on bentonite. Constants k(1,Cs)= 0.521 mmol·g(-1), k(2,Cs)= 968 L·mol(-1), and k(2,M)= 592 L·mol(-1) were obtained for Cs uptake described by multicomponent Langmuir isotherm. For the ion-exchange model, the thermodynamic equilibrium constant K = 75.5 mL·g(-1) with a standard deviation of s(K)= 17.4 mL·g(-1) was determined. Using the t test, the calculated data of multicomponent Langmuir and ion-exchange isotherms were fit to experimental data, and the best agreement was obtained for the ion-exchange model. The results show that Cs uptake by bentonite could be substantially decreased in systems with a high bentonite-to-water (m/V) ratio as a consequence of the presence of desorbed divalent cations in the liquid phase. | en |
| dc.identifier.citation | Langmuir. 2007, vol. 23, issue 3, p. 1227 - 1233. | en |
| dc.identifier.doi | 10.1021/la062080b | |
| dc.identifier.issn | 0743-7463 | |
| dc.identifier.location | Není ve fondu ÚK | en |
| dc.identifier.uri | http://hdl.handle.net/10084/59780 | |
| dc.identifier.wos | 000243684100043 | |
| dc.language.iso | en | en |
| dc.publisher | American Chemical Society | en |
| dc.relation.ispartofseries | Langmuir | en |
| dc.relation.uri | http://dx.doi.org/10.1021/la062080b | en |
| dc.title | Cesium uptake from aqueous solutions by bentonite: A comparison of multicomponent sorption with ion-exchange models | en |
| dc.type | article | en |