Uptake of Ce(III) and Ce(IV) on montmorillonite
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27740%2F16%3A86099837" target="_blank" >RIV/61989100:27740/16:86099837 - isvavai.cz</a>
Alternative codes found
RIV/61989100:27640/16:86099837 RIV/61989100:27600/16:86099837 RIV/61989100:27360/16:86099837
Result on the web
<a href="http://dx.doi.org/10.1016/j.clay.2016.05.012" target="_blank" >http://dx.doi.org/10.1016/j.clay.2016.05.012</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.clay.2016.05.012" target="_blank" >10.1016/j.clay.2016.05.012</a>
Alternative languages
Result language
angličtina
Original language name
Uptake of Ce(III) and Ce(IV) on montmorillonite
Original language description
Montmorillonite (Mt) doped by Ce(III) has good antimicrobial properties and doped by Ce(IV) has high permanent porosity, surface area and catalytic properties. The present study is focused on the mechanism of Ce(III) and Ce(IV) uptake on montmorillonite in neutral and acid aqueous solutions. Chemical equilibria and leaching experiments in acid solutions were evaluated using batch experiments, changes of mineral structure were monitored by X-ray diffraction (XRD), and Ce uptake on Mt surface by scanning electron microscopy (SEM). The concentrations of Ce, Na, K, Ca, Mg, Al, and Si were determined from aqueous solutions using atomic emission spectroscopy with Inductively Coupled Plasma (AES-ICP). The isotherm for Ce(III) uptake on Mt were fitted both by adsorption and ion exchange models. The exchange model with the calculated selectivity constant K =15.2L/mmolk-1 showed a better fit with experimental data than adsorption models. The uptake of Ce(III) on Mt at pH2 was controlled by ion exchange, accompanied by increasing leaching of cations from 2:1 montmorillonite layers. A high uptake of Ce(IV) on Mt (~ 6meq/g, i.e.~210mg/g) at pH2 and 6 in excess of the cation exchange capacity (0.76meq/g) was found and explained by the formation of a mixture of two Ce(IV) complexes fixed on Mt; the first was insoluble and the second soluble in 3M H2SO4 but insoluble in acid aqueous solution at pH2. A small amount of ion exchanged Ce (IV) (~ 0.27meq/g) was also determined in samples of Ce(IV)-Mt prepared at pH2. The Ce(III) and Ce(IV) uptake on Mt at pH6 reached equilibrium in <30min, while the uptake of Ce (IV) at pH2 needed at least 24h. The new findings show a very effective way for cerium uptake, especially from acidic aqueous solutions. (C) 2016 Elsevier B.V.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Applied Clay Science
ISSN
0169-1317
e-ISSN
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Volume of the periodical
132
Issue of the periodical within the volume
NOV 2016
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
41-49
UT code for WoS article
000385600600007
EID of the result in the Scopus database
2-s2.0-84969922380