Sorption of Eu(III) on a Natural Hematite: Application of a Surface Complexation Model
Identifieur interne : 000E91 ( Main/Exploration ); précédent : 000E90; suivant : 000E92Sorption of Eu(III) on a Natural Hematite: Application of a Surface Complexation Model
Auteurs : Thomas Rabung [Allemagne] ; Horst Geckeis [Allemagne] ; Jae-Il Kim [Allemagne] ; Horst Philipp Beck [Allemagne]Source :
- Journal of Colloid And Interface Science [ 0021-9797 ] ; 1998.
English descriptors
- KwdEn :
- Teeft :
- Academic press, Acidity constants, Acta, Adsorption, Base constants, Base properties, Capacitance, Carbonate complexation, Code fiteql, Colloid interface, Complexation, Complexation constants, Complexation reaction, Considerable fraction, Constant capacitance model, Distribution ratios, Electrostatic term, Elemental composition, Experimental conditions, Experimental data, Experimental results, Fiteql, Free concentration, Function plot, Graphical method, Hematite, Hematite surface, High concentrations, High surface coverage, High surface coverages, Higher concentrations, Higher surface coverage, Higher surface coverages, Hydroxyl, Interface, Interface geochemistry, Ionic strength, Isotherm, Isotherm data, Langmuir, Langmuir equation, Langmuir formalism, Langmuir isotherm, Latter procedure, Literature data, Meaningful comparison, Mineral surface, Mineral surfaces, Mineralogical society, Model system, Modeling, Monodentate complexation, Naclo4, Natural hematite, Natural minerals, Nonideal sorption behavior, Precipitation, Present study, Rare earth elements, Reversibility studies, Several orders, Site complexation, Sorbate concentration, Sorption, Sorption behavior, Sorption constants, Sorption data, Sorption experiments, Sorption isotherm, Sorption isotherms, Sorption mechanisms, Sorption process, Sorption reaction, Sorption reactions, Strong site complexation, Surface area, Surface charge, Surface charge effect, Surface complexation, Surface complexation constants, Surface complexation model, Surface complexation modeling, Surface complexation models, Surface complexation reaction, Surface coverage, Surface coverages, Surface hydroxyl groups, Surface precipitation, Surface precipitation reaction, Surface site concentration, Surface sites, Surface species, Synthetic hematite, Titration, Titration data, Total concentration, Trivalent, Trivalent actinides, Trivalent elements, Tting, Tting titration data, Weak sites.
Abstract
The solid/water interface reaction is investigated for the sorption of the Eu3+ion onto a well-characterized natural hematite at pH ≤6 in 0.1 mol/L NaClO4. Sorption isotherms are determined at different pH. The sorption of Eu3+onto hematite at coverages <1% of the surface hydroxyl groups follows the ideal Nernst behavior and can be interpreted in terms of the surface complexation by the following equilibrium reaction: XOH + Eu3+⇔ XOEu2++ H+(logKintx= 2.50 ± 0.19). Complexation constants are calculated by either graphically interpretating the sorption isotherms or fitting the data using the code FITEQL. At higher surface coverages a deviation from the Nernst behavior is observed which can be described satisfactorily by a two-site surface complexation model, taking into account the lateral electrostatic interaction of surface-bound Eu(III): YOH + Eu3+⇔ YOEu2++ H+(logKinty= −0.82 ± 0.11). The experimental results are compared with data published in the literature, and the interpretation of sorption isotherms with regard to the sorption mechanisms is critically discussed.
Url:
DOI: 10.1006/jcis.1998.5788
Affiliations:
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Box 3640, D-76021, Karlsruhe</wicri:regionArea><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Karlsruhe</region><settlement type="city">Karlsruhe</settlement></placeName></affiliation></author><author><name sortKey="Kim, Jae Il" sort="Kim, Jae Il" uniqKey="Kim J" first="Jae-Il" last="Kim">Jae-Il Kim</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgungstechnik, P.O. Box 3640, D-76021, Karlsruhe</wicri:regionArea><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Karlsruhe</region><settlement type="city">Karlsruhe</settlement></placeName></affiliation></author><author><name sortKey="Beck, Horst Philipp" sort="Beck, Horst Philipp" uniqKey="Beck H" first="Horst Philipp" last="Beck">Horst Philipp Beck</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Universität des Saarlandes, Anorganische und Analytische Chemie und Radiochemie, P.O. Box 15 11 50, D-66041, Saarbrücken</wicri:regionArea><placeName><region type="land" nuts="2">Sarre (Land)</region><settlement type="city">Sarrebruck</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Colloid And Interface Science</title><title level="j" type="abbrev">YJCIS</title><idno type="ISSN">0021-9797</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1998">1998</date><biblScope unit="volume">208</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="153">153</biblScope><biblScope unit="page" to="161">161</biblScope></imprint><idno type="ISSN">0021-9797</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0021-9797</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>adsorption isotherms</term><term>europium</term><term>hematite</term><term>surface complexation modeling</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Academic press</term><term>Acidity constants</term><term>Acta</term><term>Adsorption</term><term>Base constants</term><term>Base properties</term><term>Capacitance</term><term>Carbonate complexation</term><term>Code fiteql</term><term>Colloid interface</term><term>Complexation</term><term>Complexation constants</term><term>Complexation reaction</term><term>Considerable fraction</term><term>Constant capacitance model</term><term>Distribution ratios</term><term>Electrostatic term</term><term>Elemental composition</term><term>Experimental conditions</term><term>Experimental data</term><term>Experimental results</term><term>Fiteql</term><term>Free concentration</term><term>Function plot</term><term>Graphical method</term><term>Hematite</term><term>Hematite surface</term><term>High concentrations</term><term>High surface coverage</term><term>High surface coverages</term><term>Higher concentrations</term><term>Higher surface coverage</term><term>Higher surface coverages</term><term>Hydroxyl</term><term>Interface</term><term>Interface geochemistry</term><term>Ionic strength</term><term>Isotherm</term><term>Isotherm data</term><term>Langmuir</term><term>Langmuir equation</term><term>Langmuir formalism</term><term>Langmuir isotherm</term><term>Latter procedure</term><term>Literature data</term><term>Meaningful comparison</term><term>Mineral surface</term><term>Mineral surfaces</term><term>Mineralogical society</term><term>Model system</term><term>Modeling</term><term>Monodentate complexation</term><term>Naclo4</term><term>Natural hematite</term><term>Natural minerals</term><term>Nonideal sorption behavior</term><term>Precipitation</term><term>Present study</term><term>Rare earth elements</term><term>Reversibility studies</term><term>Several orders</term><term>Site complexation</term><term>Sorbate concentration</term><term>Sorption</term><term>Sorption behavior</term><term>Sorption constants</term><term>Sorption data</term><term>Sorption experiments</term><term>Sorption isotherm</term><term>Sorption isotherms</term><term>Sorption mechanisms</term><term>Sorption process</term><term>Sorption reaction</term><term>Sorption reactions</term><term>Strong site complexation</term><term>Surface area</term><term>Surface charge</term><term>Surface charge effect</term><term>Surface complexation</term><term>Surface complexation constants</term><term>Surface complexation model</term><term>Surface complexation modeling</term><term>Surface complexation models</term><term>Surface complexation reaction</term><term>Surface coverage</term><term>Surface coverages</term><term>Surface hydroxyl groups</term><term>Surface precipitation</term><term>Surface precipitation reaction</term><term>Surface site concentration</term><term>Surface sites</term><term>Surface species</term><term>Synthetic hematite</term><term>Titration</term><term>Titration data</term><term>Total concentration</term><term>Trivalent</term><term>Trivalent actinides</term><term>Trivalent elements</term><term>Tting</term><term>Tting titration data</term><term>Weak sites</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The solid/water interface reaction is investigated for the sorption of the Eu3+ion onto a well-characterized natural hematite at pH ≤6 in 0.1 mol/L NaClO4. Sorption isotherms are determined at different pH. The sorption of Eu3+onto hematite at coverages <1% of the surface hydroxyl groups follows the ideal Nernst behavior and can be interpreted in terms of the surface complexation by the following equilibrium reaction: XOH + Eu3+⇔ XOEu2++ H+(logKintx= 2.50 ± 0.19). Complexation constants are calculated by either graphically interpretating the sorption isotherms or fitting the data using the code FITEQL. At higher surface coverages a deviation from the Nernst behavior is observed which can be described satisfactorily by a two-site surface complexation model, taking into account the lateral electrostatic interaction of surface-bound Eu(III): YOH + Eu3+⇔ YOEu2++ H+(logKinty= −0.82 ± 0.11). The experimental results are compared with data published in the literature, and the interpretation of sorption isotherms with regard to the sorption mechanisms is critically discussed.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Bade-Wurtemberg</li><li>District de Karlsruhe</li><li>Sarre (Land)</li></region><settlement><li>Karlsruhe</li><li>Sarrebruck</li></settlement></list><tree><country name="Allemagne"><region name="Sarre (Land)"><name sortKey="Rabung, Thomas" sort="Rabung, Thomas" uniqKey="Rabung T" first="Thomas" last="Rabung">Thomas Rabung</name></region><name sortKey="Beck, Horst Philipp" sort="Beck, Horst Philipp" uniqKey="Beck H" first="Horst Philipp" last="Beck">Horst Philipp Beck</name><name sortKey="Geckeis, Horst" sort="Geckeis, Horst" uniqKey="Geckeis H" first="Horst" last="Geckeis">Horst Geckeis</name><name sortKey="Kim, Jae Il" sort="Kim, Jae Il" uniqKey="Kim J" first="Jae-Il" last="Kim">Jae-Il Kim</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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