Vermiculite as efficient sorbent of Ce-III and Ce-IV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F17%3A86099160" target="_blank" >RIV/61989100:27360/17:86099160 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27600/17:86099160 RIV/61989100:27640/17:86099160 RIV/61989100:27740/17:86099160

Výsledek na webu

<a href="http://dx.doi.org/10.1071/EN16112" target="_blank" >http://dx.doi.org/10.1071/EN16112</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1071/EN16112" target="_blank" >10.1071/EN16112</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Vermiculite as efficient sorbent of Ce-III and Ce-IV

Popis výsledku v původním jazyce

This study focussed on the mechanism of Ce-III and Ce-IV uptake on vermiculite (Ver), which has been studied sporadically. Chemical equilibrium and leaching experiments in acid solutions were evaluated using batch experiments and changes of mineral composition were monitored by X-ray powder diffraction analysis. The concentrations of Ce, Na, K, Ca, Mg, Al and Si were determined by atomic emission spectroscopy coupled with inductively coupled plasma (AES-ICP). The data for Ce-III uptake on Ver in neutral aqueous solution were fitted both with adsorption and ion-exchange models. The latter, with a calculated selectivity constant (K-V) over bar = 14.30 (L mmol(-1))(k-1), showed a better fit with experimental data than adsorption models. The uptake of Ce-III on Ver at pH 2 was also controlled by intensive leaching of cations from 2 : 1 layers and therefore these data were not fitted. A much higher uptake of Ce-IV on Ver (similar to 6 mequiv. g(-1), i.e., similar to 210 mg g(-1)) at pH 2 and 6 in comparison with the cation-exchange capacity of original vermiculite (1.28 mequiv. g(-1)) was found and explained. With regard to the different rate of Ce-IV species fixation on Ver, their different Ce-IV solubility in NaCl solution, aqueous acid solution (pH 2), and 3 M H2SO4, three species of Ce-IV bonded on vermiculite are proposed. They are ion-exchanged Ce-IV, Ce-IV-complex 1 and Ce-IV-complex 2. The Ce-IV species uptake on Ver was quantitatively determined both for pH 2 and 6. The new findings show a very effective method of cerium uptake, especially from acidic aqueous solutions.

Název v anglickém jazyce

Vermiculite as efficient sorbent of Ce-III and Ce-IV

Popis výsledku anglicky

This study focussed on the mechanism of Ce-III and Ce-IV uptake on vermiculite (Ver), which has been studied sporadically. Chemical equilibrium and leaching experiments in acid solutions were evaluated using batch experiments and changes of mineral composition were monitored by X-ray powder diffraction analysis. The concentrations of Ce, Na, K, Ca, Mg, Al and Si were determined by atomic emission spectroscopy coupled with inductively coupled plasma (AES-ICP). The data for Ce-III uptake on Ver in neutral aqueous solution were fitted both with adsorption and ion-exchange models. The latter, with a calculated selectivity constant (K-V) over bar = 14.30 (L mmol(-1))(k-1), showed a better fit with experimental data than adsorption models. The uptake of Ce-III on Ver at pH 2 was also controlled by intensive leaching of cations from 2 : 1 layers and therefore these data were not fitted. A much higher uptake of Ce-IV on Ver (similar to 6 mequiv. g(-1), i.e., similar to 210 mg g(-1)) at pH 2 and 6 in comparison with the cation-exchange capacity of original vermiculite (1.28 mequiv. g(-1)) was found and explained. With regard to the different rate of Ce-IV species fixation on Ver, their different Ce-IV solubility in NaCl solution, aqueous acid solution (pH 2), and 3 M H2SO4, three species of Ce-IV bonded on vermiculite are proposed. They are ion-exchanged Ce-IV, Ce-IV-complex 1 and Ce-IV-complex 2. The Ce-IV species uptake on Ver was quantitatively determined both for pH 2 and 6. The new findings show a very effective method of cerium uptake, especially from acidic aqueous solutions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Environmental Chemistry

ISSN

1448-2517

e-ISSN

—

Svazek periodika

14

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

AU - Austrálie

Počet stran výsledku

9

Strana od-do

39-47

Kód UT WoS článku

000392205800005

EID výsledku v databázi Scopus

2-s2.0-85008873355