Cesium transport in Czech compacted bentonite: Planar source and through diffusion methods evaluated considering non-linearity of sorption isotherm

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00370256" target="_blank" >RIV/68407700:21340/23:00370256 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.clay.2023.107150" target="_blank" >https://doi.org/10.1016/j.clay.2023.107150</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.clay.2023.107150" target="_blank" >10.1016/j.clay.2023.107150</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Cesium transport in Czech compacted bentonite: Planar source and through diffusion methods evaluated considering non-linearity of sorption isotherm

Popis výsledku v původním jazyce

The aim of the presented study was to determine the influence of non-linear character of Cs sorption isotherm and dominant interlayer cation on the sorption and diffusion properties of the Czech compacted bentonite. Planar source and through diffusion experiments with Cs on the compacted bentonite were performed and evaluated by suitable methods accounting for the transient state of diffusion and the presence of separating filters. It was shown that the observed Cs concentration profiles can be appropriately simulated with the use of Langmuir isotherm. The fitted values of sorption parameters obtained from the evaluation of through diffusion experiments generally agreed with the values expected from the batch sorption experiments. The most important factor for the Cs diffusion was its total concentration in the experiment with Da values ranging from about 1⨯10-13 m2 ⋅s-1 at the Cs concentration 10-7 M to about 4⨯10- 12 m2 ⋅s-1 at the Cs concentration 10-3 M. The observed discrepancies between the experimental data and the standard model based on Fickian diffusion were explained by the application of dual transport model using so-called surface diffusion theory. The importance of surface diffusion in through diffusion experiments increased with increasing Cs total concentration, which indicates that this effect is probably connected to the ion exchange mechanism on layer sites of bentonite

Název v anglickém jazyce

Cesium transport in Czech compacted bentonite: Planar source and through diffusion methods evaluated considering non-linearity of sorption isotherm

Popis výsledku anglicky

The aim of the presented study was to determine the influence of non-linear character of Cs sorption isotherm and dominant interlayer cation on the sorption and diffusion properties of the Czech compacted bentonite. Planar source and through diffusion experiments with Cs on the compacted bentonite were performed and evaluated by suitable methods accounting for the transient state of diffusion and the presence of separating filters. It was shown that the observed Cs concentration profiles can be appropriately simulated with the use of Langmuir isotherm. The fitted values of sorption parameters obtained from the evaluation of through diffusion experiments generally agreed with the values expected from the batch sorption experiments. The most important factor for the Cs diffusion was its total concentration in the experiment with Da values ranging from about 1⨯10-13 m2 ⋅s-1 at the Cs concentration 10-7 M to about 4⨯10- 12 m2 ⋅s-1 at the Cs concentration 10-3 M. The observed discrepancies between the experimental data and the standard model based on Fickian diffusion were explained by the application of dual transport model using so-called surface diffusion theory. The importance of surface diffusion in through diffusion experiments increased with increasing Cs total concentration, which indicates that this effect is probably connected to the ion exchange mechanism on layer sites of bentonite

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Centrum pokročilých aplikovaných přírodních věd</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Clay Science

ISSN

0169-1317

e-ISSN

1872-9053

Svazek periodika

245

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

—

Kód UT WoS článku

001096734500001

EID výsledku v databázi Scopus

2-s2.0-85173575278