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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

  • Czech description

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

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

  • 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