The study of mechanism of cesium sorption by modified aluminosilicates

2018 ◽  
Author(s):  
A. V. Voronina ◽  
P. A. Orlov ◽  
M. A. Mashkovtsev ◽  
V. S. Semenishchev
Keyword(s):  
Cesium Sorption ◽  
Modified Aluminosilicates

scholarly journals Modeling cesium migration through Opalinus clay: a benchmark for single- and multi-species sorption-diffusion models

2021 ◽  
Author(s):  
Jesús F. Águila ◽  
Vanessa Montoya ◽  
Javier Samper ◽  
Luis Montenegro ◽  
Georg Kosakowski ◽  
...  
Keyword(s):  
Time Discretization ◽  
Single Species ◽  
Opalinus Clay ◽  
Sorption Behavior ◽  
Diffusion Experiment ◽  
Modeling Tools ◽  
Cesium Sorption ◽  
Code Performance ◽  
Good Agreement

AbstractSophisticated modeling of the migration of sorbing radionuclides in compacted claystones is needed for supporting the safety analysis of deep geological repositories for radioactive waste, which requires robust modeling tools/codes. Here, a benchmark related to a long term laboratory scale diffusion experiment of cesium, a moderately sorbing radionuclide, through Opalinus clay is presented. The benchmark was performed with the following codes: CORE2DV5, Flotran, COMSOL Multiphysics, OpenGeoSys-GEM, MCOTAC and PHREEQC v.3. The migration setup was solved with two different conceptual models, i) a single-species model by using a look-up table for a cesium sorption isotherm and ii) a multi-species diffusion model including a complex mechanistic cesium sorption model. The calculations were performed for three different cesium boundary concentrations (10−3, 10−5, 10−7 mol / L) to investigate the models/codes capabilities taking into account the nonlinear sorption behavior of cesium. Generally, good agreement for both single- and multi-species benchmark concepts could be achieved, however, some discrepancies have been identified, especially near the boundaries, where code specific spatial (and time) discretization had to be improved to achieve better agreement at the expense of longer computation times. In addition, the benchmark exercise yielded useful information on code performance, setup options, input and output data management, and post processing options. Finally, the comparison of single-species and multi-species model concepts showed that the single-species approach yielded generally earlier breakthrough, because this approach accounts neither for cation exchange of Cs+ with K+ and Na+, nor K+ and Na+ diffusion in the pore water.

Cesium sorption on bentonites and montmorillonite K10

2010 ◽  
Vol 284 (1) ◽  
pp. 55-64 ◽  
Author(s):  
M. Galamboš ◽  
V. Paučová ◽  
J. Kufčáková ◽  
O. Rosskopfová ◽  
P. Rajec ◽  
...  
Keyword(s):  
Montmorillonite K10 ◽  
Cesium Sorption

Effect of humic acid on cesium sorption on silica colloids

2006 ◽  
Vol 94 (6-7) ◽  
Author(s):  
Sumit Kumar ◽  
B. S. Tomar ◽  
S. Ramanathan ◽  
V. K. Manchanda
Keyword(s):  
Humic Acid ◽  
Sorption Behaviour ◽  
Cesium Sorption ◽  
Silica Colloids

SummaryEffect of humic acid (HA) on the sorption behaviour of

High-Temperature Cesium Sorption in Calcined Kaolin Packed Beds

2004 ◽  
Vol 21 (1) ◽  
pp. 73-81 ◽  
Author(s):  
H.C. Yang ◽  
J.S. Yun ◽  
M.J. Kang ◽  
Y. Kang ◽  
J.H. Kim
Keyword(s):  
High Temperature ◽  
Packed Beds ◽  
Cesium Sorption ◽  
Calcined Kaolin

A study of strontium and cesium sorption-desorption on bentonites of different composition

2017 ◽  
Vol 72 (4) ◽  
pp. 290-298
Author(s):  
M. L. Kuleshova ◽  
N. N. Danchenko ◽  
V. L. Kosorukov ◽  
V. I. Sergeev ◽  
T. G. Shimko
Keyword(s):  
Cesium Sorption

Study of the sorption and modelling of cesium by a Brazilian bentonite using PHREEQC

MRS Advances ◽  
2020 ◽  
Vol 5 (5-6) ◽  
pp. 245-252
Author(s):  
Clédola C. O. de Tello ◽  
Daisy M. M dos Santos ◽  
Thais B. Teixeira
Keyword(s):  
Diffusion Coefficient ◽  
Flow Cell ◽  
Batch Adsorption ◽  
Radionuclide Transport ◽  
One Dimensional ◽  
Cesium Sorption ◽  
Dimensional Flow ◽  
Retardation Coefficient ◽  
Cesium Radionuclide

ABSTRACTTo estimate the cesium sorption by the bentonite and to obtain the isotherms, some batch-adsorption experiments are being carried out, being the Kd (retardation coefficient) calculated from these isotherms. One-dimensional flow cell was constructed to measure the bentonite permeability regarding to a cesium solution, which results will be used to evaluate the diffusion coefficient – D. It will be used the PHREEQC software to model the transport of the cesium radionuclide through this bentonite with the Kd and D data. The modelling of radionuclide transport in the Brazilian materials will contribute to evaluate the efficiency of multi-barriers system of the national repository, because it is one of its safety criteria.

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