The influence of temperature on selenate adsorption by goethite

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
Sammlungen
  • metadata
ISSN
0033-8230
Ausgabe der Veröffentlichung
7
Zeitschrift
Radiochimica acta
Schlüsselwörter
  • 550 Geowissenschaften
  • 550 Earth sciences
Sprache
eng
Paginierung
Seiten: 413 - 419
Datum der Veröffentlichung
2013
Herausgeber
Oldenbourg
Herausgeber URL
http://dx.doi.org/10.1524/ract.2013.2041
Datum der Datenerfassung
2020
Datum, an dem der Datensatz öffentlich gemacht wurde
2020
Zugang
Public
Titel
The influence of temperature on selenate adsorption by goethite
Ausgabe der Zeitschrift
101

Datenquelle: METADATA.UB

Andere Metadatenquellen:
Autoren
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000322298200003&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1524/ract.2013.2041
Externe Identifier
  • Clarivate Analytics Document Solution ID: 189WE
ISSN
0033-8230
Ausgabe der Veröffentlichung
7
Zeitschrift
RADIOCHIMICA ACTA
Schlüsselwörter
  • Thermodynamics
  • Van't Hoff equation
  • Selenate
  • Goethite
  • Adsorption
  • Temperature
Paginierung
413 - 419
Datum der Veröffentlichung
2013
Status
Published
Titel
The influence of temperature on selenate adsorption by goethite
Sub types
  • Article
Ausgabe der Zeitschrift
101

Datenquelle: Web of Science (Lite)

Abstract
<jats:title>Abstract</jats:title> <jats:p>Acid-base batch titration data up to 75 ºC were used to constrain a temperature-dependent 1-p<jats:italic>K</jats:italic> basic Stern model of the surface protonation reactions of goethite. Experimental data for the temperature dependence of pH<jats:sub>PZC</jats:sub> (as determined using the two-term Van't Hoff extrapolation) yielded a negative value of −44.9 kJ/mol for the surface protonation enthalpy, and therefore a shift of the zero point of charge towards lower pH values with increasing temperature. Batch titrations at selenate concentrations of between 10 and 100 μM showed an increased degree of adsorption in the acidic pH range, which appeared to be sensitive to the ionic strength of the solution. The selenate adsorption edges shifted towards more acidic pH values with increasing temperature. A 1-p<jats:italic>K</jats:italic> charge distribution multi-site surface complexation (CD-MUSIC) model was applied, assuming the formation of an outer-spheric surface complex together with an inner-spheric one, in agreement with published spectroscopic information. The temperature behaviour of the intrinsic equilibrium constants were well represented by a linear Van't Hoff log <jats:italic>K</jats:italic> <jats:italic>vs</jats:italic>. 1/<jats:italic>T</jats:italic> plot, from which negative enthalpy values could be derived for both adsorption reactions. The adsorption of the selenate was therefore exothermic and became weaker with increasing temperature. The bidentate inner-spheric complex was more sensitive to rises in temperature (−70 kJ/mol), compared to the outer-spheric complex (−36 kJ/mol). The latter ultimately became the dominating adsorption process at the highest temperature studied.</jats:p>
Autoren
DOI
10.1524/ract.2013.2041
ISSN
0033-8230
Ausgabe der Veröffentlichung
7
Zeitschrift
ract
Sprache
en
Online publication date
2013
Paginierung
413 - 420
Datum der Veröffentlichung
2013
Status
Published
Herausgeber
Walter de Gruyter GmbH
Herausgeber URL
http://dx.doi.org/10.1524/ract.2013.2041
Datum der Datenerfassung
2021
Titel
The influence of temperature on selenate adsorption by goethite
Ausgabe der Zeitschrift
101

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