Aqueous solubility diagrams for cementitious waste stabilization systems. 3. Mechanism of zinc immobilization by calcium silicate hydrate

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000176591600036&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1021/es0102484
eISSN
1520-5851
Externe Identifier
  • Clarivate Analytics Document Solution ID: 569GA
  • PubMed Identifier: 12144268
ISSN
0013-936X
Ausgabe der Veröffentlichung
13
Zeitschrift
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Paginierung
2919 - 2925
Datum der Veröffentlichung
2002
Status
Published
Titel
Aqueous solubility diagrams for cementitious waste stabilization systems. 3. Mechanism of zinc immobilization by calcium silicate hydrate
Sub types
  • Article
Ausgabe der Zeitschrift
36

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Autoren
DOI
10.1021/es0102484
eISSN
1520-5851
ISSN
0013-936X
Ausgabe der Veröffentlichung
13
Zeitschrift
Environmental Science & Technology
Sprache
en
Online publication date
2002
Paginierung
2919 - 2925
Datum der Veröffentlichung
2002
Status
Published
Herausgeber
American Chemical Society (ACS)
Herausgeber URL
http://dx.doi.org/10.1021/es0102484
Datum der Datenerfassung
2023
Titel
Aqueous Solubility Diagrams for Cementitious Waste Stabilization Systems. 3. Mechanism of Zinc Immobilizaton by Calcium Silicate Hydrate
Ausgabe der Zeitschrift
36

Datenquelle: Crossref

Abstract
Zinc oxide was added during hydration of alite (C3S) as an analogue for solidification/stabilization by cement of metal-bearing hazardous waste. Curing of samples was stopped at various intervals between 8 h and 100 d, and the reaction products were analyzed by both X-ray diffraction (XRD) and X-ray absorption spectroscopy (EXAFS at Zn, Ca, and Si K-edges). Calcium zincate hydrate (CaZn2(OH)6 x 2H2O) initially formed together with calcium silicate hydrate (CSH) vanishes from X-ray diffractograms after 14 d, and no other crystalline Zn-bearing phase could be detected thereafter. EXAFS Zn K-edge data analysis reveals that Zn(O,OH)4 tetrahedra continue to determine the first shell coordination. However, a new Zn-Si bond appears in the second coordination shell as indicated by both Zn K-edge and Si K-edge EXAFS. Together with the Ca-Zn and Ca-Ca shells derived from the Ca K-edge EXAFS spectra, a structural model for the site occupation of Zn in CSH is proposed, whereby the Zn(O,OH)4 tetrahedra are bound in layer rather than interlayer positions substituting for the silicate bridging tetrahedra and/or at terminal silicate chain sites. This structural model enables ultimately the formulation of a thermodyamic Lippmann model to predict the aqueous solubility of Zn in solid solution with a CSH phase of a Ca/Si ratio fixed to unity.
Autoren
DOI
10.1021/es0102484
eISSN
1520-5851
Externe Identifier
  • PubMed Identifier: 12144268
Open access
false
ISSN
0013-936X
Ausgabe der Veröffentlichung
13
Zeitschrift
Environmental science & technology
Schlüsselwörter
  • Calcium Compounds
  • Zinc
  • Silicates
  • Industrial Waste
  • Environmental Pollution
  • Refuse Disposal
  • Solubility
  • Models, Theoretical
  • Manufactured Materials
Sprache
eng
Medium
Print
Paginierung
2919 - 2925
Datum der Veröffentlichung
2002
Status
Published
Datum der Datenerfassung
2002
Titel
Aqueous solubility diagrams for cementitious waste stabilization systems. 3. Mechanism of zinc immobilizaton by calcium silicate hydrate.
Sub types
  • Research Support, Non-U.S. Gov't
  • Journal Article
Ausgabe der Zeitschrift
36

Datenquelle: Europe PubMed Central

Abstract
Zinc oxide was added during hydration of alite (C3S) as an analogue for solidification/stabilization by cement of metal-bearing hazardous waste. Curing of samples was stopped at various intervals between 8 h and 100 d, and the reaction products were analyzed by both X-ray diffraction (XRD) and X-ray absorption spectroscopy (EXAFS at Zn, Ca, and Si K-edges). Calcium zincate hydrate (CaZn2(OH)6 x 2H2O) initially formed together with calcium silicate hydrate (CSH) vanishes from X-ray diffractograms after 14 d, and no other crystalline Zn-bearing phase could be detected thereafter. EXAFS Zn K-edge data analysis reveals that Zn(O,OH)4 tetrahedra continue to determine the first shell coordination. However, a new Zn-Si bond appears in the second coordination shell as indicated by both Zn K-edge and Si K-edge EXAFS. Together with the Ca-Zn and Ca-Ca shells derived from the Ca K-edge EXAFS spectra, a structural model for the site occupation of Zn in CSH is proposed, whereby the Zn(O,OH)4 tetrahedra are bound in layer rather than interlayer positions substituting for the silicate bridging tetrahedra and/or at terminal silicate chain sites. This structural model enables ultimately the formulation of a thermodyamic Lippmann model to predict the aqueous solubility of Zn in solid solution with a CSH phase of a Ca/Si ratio fixed to unity.
Autoren
Autoren-URL
https://www.ncbi.nlm.nih.gov/pubmed/12144268
DOI
10.1021/es0102484
ISSN
0013-936X
Ausgabe der Veröffentlichung
13
Zeitschrift
Environ Sci Technol
Schlüsselwörter
  • Calcium Compounds
  • Environmental Pollution
  • Industrial Waste
  • Manufactured Materials
  • Models, Theoretical
  • Refuse Disposal
  • Silicates
  • Solubility
  • Zinc
Sprache
eng
Country
United States
Paginierung
2919 - 2925
Datum der Veröffentlichung
2002
Status
Published
Datum, an dem der Datensatz öffentlich gemacht wurde
2003
Titel
Aqueous solubility diagrams for cementitious waste stabilization systems. 3. Mechanism of zinc immobilizaton by calcium silicate hydrate.
Sub types
  • Journal Article
  • Research Support, Non-U.S. Gov't
Ausgabe der Zeitschrift
36

Datenquelle: PubMed

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