Adsorption mechanism of arsenate by zirconyl-functionalized activated carbon

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • Gerald T Schmidt
  • Nataliya Vlasova
  • Damdinsuren Zuzaan
  • Michael Kersten
  • Birgit Daus
Sammlungen
  • metadata
ISSN
0021-9797
Ausgabe der Veröffentlichung
1
Zeitschrift
Journal of colloid and interface science
Schlüsselwörter
  • 550 Geowissenschaften
  • 550 Earth sciences
Sprache
eng
Paginierung
Seiten: 228 - 234
Datum der Veröffentlichung
2008
Herausgeber
Elsevier
Herausgeber URL
http://dx.doi.org/10.1016/j.jcis.2007.09.012
Datum der Datenerfassung
2020
Datum, an dem der Datensatz öffentlich gemacht wurde
2020
Zugang
Public
Titel
Adsorption mechanism of arsenate by zirconyl-functionalized activated carbon
Ausgabe der Zeitschrift
317

Datenquelle: METADATA.UB

Andere Metadatenquellen:
Autoren
  • Gerald T Schmidt
  • Nataliya Vlasova
  • Damdinsuren Zuzaan
  • Michael Kersten
  • Birgit Daus
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000251283100027&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1016/j.jcis.2007.09.012
eISSN
1095-7103
Externe Identifier
  • Clarivate Analytics Document Solution ID: 236DL
  • PubMed Identifier: 17927995
ISSN
0021-9797
Ausgabe der Veröffentlichung
1
Zeitschrift
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Schlüsselwörter
  • arsenate
  • adsorption modeling
  • activated carbon
  • zirconyl
  • EXAFS
Paginierung
228 - 234
Datum der Veröffentlichung
2008
Status
Published
Titel
Adsorption mechanism of arsenate by zirconyl-functionalized activated carbon
Sub types
  • Article
Ausgabe der Zeitschrift
317

Datenquelle: Web of Science (Lite)

Autoren
  • Gerald T Schmidt
  • Nataliya Vlasova
  • Damdinsuren Zuzaan
  • Michael Kersten
  • Birgit Daus
DOI
10.1016/j.jcis.2007.09.012
ISSN
0021-9797
Ausgabe der Veröffentlichung
1
Zeitschrift
Journal of Colloid and Interface Science
Sprache
en
Paginierung
228 - 234
Datum der Veröffentlichung
2008
Status
Published
Herausgeber
Elsevier BV
Herausgeber URL
http://dx.doi.org/10.1016/j.jcis.2007.09.012
Datum der Datenerfassung
2019
Titel
Adsorption mechanism of arsenate by zirconyl-functionalized activated carbon
Ausgabe der Zeitschrift
317

Datenquelle: Crossref

Abstract
Arsenate [As(V)] and arsenite [As(III)] sorption at the solid-water interface of activated carbon impregnated with zirconyl nitrate (Zr-AC) was investigated using X-ray absorption spectroscopy (XAS) and surface complexation modeling. The XAS data at the Zr K-edge suggest that the structure of the zirconyl nitrate coating is built from chains of edge-sharing ZrO8 trigonal dodecahedra bound to each other through two double hydroxyl bridges. The 8-fold coordination of each Zr atom is completed by four O atoms, which share a bit less than the two theoretically possible bidentate nitrate groups. On impregnation, two of the O atoms may lose their nitrate group and be transformed to hydroxyl groups ready for binding to carboxylic or phenolic ligands at the AC surface. As K-edge XANES results showed the presence of only As(V) on adsorption regardless of the initial As oxidation state. Oxidation to As(V) is probably mediated by available carbon species on the AC surface as found by batch titration. Zr K-edge EXAFS data indicate that arsenate tetrahedra form monodentate mononuclear surface complexes with free hydroxyl groups of zirconyl dodecahedra, whereby each bidentate nitrate group is exchanged by up to two arsenate groups. The inner-sphere arsenate binding to the Zr-AC surface sites constrained with the spectroscopic results was used in the formulation of a surface complexation model to successfully describe the adsorption behavior of arsenate in the pH range between 4 and 12. The results suggest therefore that Zr-AC is an effective adsorbent for arsenic removal due to its high surface area and the presence of high affinity surface hydroxyl groups.
Addresses
  • Environmental Geochemistry Group, Institute of Geosciences, Johannes Gutenberg-University, 55099 Mainz, Germany.
Autoren
  • Gerald T Schmidt
  • Nataliya Vlasova
  • Damdinsuren Zuzaan
  • Michael Kersten
  • Birgit Daus
DOI
10.1016/j.jcis.2007.09.012
eISSN
1095-7103
Externe Identifier
  • PubMed Identifier: 17927995
Open access
false
ISSN
0021-9797
Ausgabe der Veröffentlichung
1
Zeitschrift
Journal of colloid and interface science
Schlüsselwörter
  • Arsenates
  • Arsenites
  • Nitrates
  • Carbon
  • Zirconium
  • Water
  • Spectrum Analysis
  • Potentiometry
  • Adsorption
  • Surface Properties
  • X-Rays
Sprache
eng
Medium
Print-Electronic
Online publication date
2007
Paginierung
228 - 234
Datum der Veröffentlichung
2008
Status
Published
Datum der Datenerfassung
2007
Titel
Adsorption mechanism of arsenate by zirconyl-functionalized activated carbon.
Sub types
  • Research Support, Non-U.S. Gov't
  • Journal Article
Ausgabe der Zeitschrift
317

Datenquelle: Europe PubMed Central

Abstract
Arsenate [As(V)] and arsenite [As(III)] sorption at the solid-water interface of activated carbon impregnated with zirconyl nitrate (Zr-AC) was investigated using X-ray absorption spectroscopy (XAS) and surface complexation modeling. The XAS data at the Zr K-edge suggest that the structure of the zirconyl nitrate coating is built from chains of edge-sharing ZrO8 trigonal dodecahedra bound to each other through two double hydroxyl bridges. The 8-fold coordination of each Zr atom is completed by four O atoms, which share a bit less than the two theoretically possible bidentate nitrate groups. On impregnation, two of the O atoms may lose their nitrate group and be transformed to hydroxyl groups ready for binding to carboxylic or phenolic ligands at the AC surface. As K-edge XANES results showed the presence of only As(V) on adsorption regardless of the initial As oxidation state. Oxidation to As(V) is probably mediated by available carbon species on the AC surface as found by batch titration. Zr K-edge EXAFS data indicate that arsenate tetrahedra form monodentate mononuclear surface complexes with free hydroxyl groups of zirconyl dodecahedra, whereby each bidentate nitrate group is exchanged by up to two arsenate groups. The inner-sphere arsenate binding to the Zr-AC surface sites constrained with the spectroscopic results was used in the formulation of a surface complexation model to successfully describe the adsorption behavior of arsenate in the pH range between 4 and 12. The results suggest therefore that Zr-AC is an effective adsorbent for arsenic removal due to its high surface area and the presence of high affinity surface hydroxyl groups.
Date of acceptance
2007
Autoren
  • Gerald T Schmidt
  • Nataliya Vlasova
  • Damdinsuren Zuzaan
  • Michael Kersten
  • Birgit Daus
Autoren-URL
https://www.ncbi.nlm.nih.gov/pubmed/17927995
DOI
10.1016/j.jcis.2007.09.012
ISSN
0021-9797
Ausgabe der Veröffentlichung
1
Zeitschrift
J Colloid Interface Sci
Schlüsselwörter
  • Adsorption
  • Arsenates
  • Arsenites
  • Carbon
  • Nitrates
  • Potentiometry
  • Spectrum Analysis
  • Surface Properties
  • Water
  • X-Rays
  • Zirconium
Sprache
eng
Country
United States
Paginierung
228 - 234
PII
S0021-9797(07)01289-1
Datum der Veröffentlichung
2008
Status
Published
Datum, an dem der Datensatz öffentlich gemacht wurde
2008
Titel
Adsorption mechanism of arsenate by zirconyl-functionalized activated carbon.
Sub types
  • Journal Article
  • Research Support, Non-U.S. Gov't
Ausgabe der Zeitschrift
317

Datenquelle: PubMed

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