Aqueous solubility of Zn incorporated into Mg-Al-layered double hydroxides

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
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Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000755403800001&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1007/s42860-021-00169-y
eISSN
1552-8367
Externe Identifier
  • Clarivate Analytics Document Solution ID: 0W3EK
ISSN
0009-8604
Ausgabe der Veröffentlichung
1
Zeitschrift
CLAYS AND CLAY MINERALS
Schlüsselwörter
  • LDH
  • Solid solution
  • Solubility product
  • SSAS
  • Thermodynamic equilibrium
  • Zinc
Paginierung
34 - 47
Datum der Veröffentlichung
2022
Status
Published
Titel
Aqueous solubility of Zn incorporated into Mg-Al-layered double hydroxides
Sub types
  • Article
Ausgabe der Zeitschrift
70

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:title>Abstract</jats:title><jats:p>Hydrotalcite minerals are layered double hydroxides (LDH) which play an important role in immobilizing hazardous compounds to decontaminate industrial wastewaters. The stability of an LDH is mostly evaluated in terms of its low solubility in water. However, the solubility of divalent trace metals immobilized by Mg-Al-type LDHs is not well known. Hydrotalcites containing Zn in solid solution, (Mg+Zn)<jats:sub>3</jats:sub>-Al-LDH, were synthesized by alkaline co-precipitation. A series of eleven LDH phases with Zn mole fractions <jats:italic>X</jats:italic><jats:sub>Zn</jats:sub> = Zn/(Mg+Zn) of 0–1 were characterized by powder X-ray diffractometry (XRD), Fourier-transform infrared (FTIR) spectroscopy, thermogravimetry (TGA), scanning and transmission electron microscopy (SEM/TEM), Brunauer-Emmett-Teller (BET) surface area analysis, and inductively coupled plasma mass (ICP-MS) spectrometry. The XRD analysis provided sharp characteristic spacings for <jats:italic>d</jats:italic><jats:sub>003</jats:sub> and <jats:italic>d</jats:italic><jats:sub>006</jats:sub> which occurred for all samples, confirming a layered LDH structure. Cell parameters (<jats:italic>a</jats:italic>, <jats:italic>c</jats:italic>) obeyed Vegard’s law and confirmed the formation of a regular solid-solution series without a mixing gap. An aqueous equilibrium time was determined by kinetic dissolution experiments. Steady-state solubility occurred after 120 days, but the experiments continued up to 240 days. The XRD and SEM/TEM analyses indicated no phase changes during the long-term dissolution experiments; neither were phase impurities detected after 240 days. The solubility products of the Mg- and Zn-bearing endmember compositions were calculated from experimentally determined total cation and anion concentrations using the <jats:italic>Visual Minteq</jats:italic> code for considering element speciation and ion pairing. The solubility product decreased as the Zn mole fraction increased, suggesting that the Zn-bearing LDH phases were more stable than the pure Mg<jats:sub>3</jats:sub>-Al-LDHs. Solid-solution aqueous-solution thermodynamic equilibrium modeling using the Lippmann “total solubility product” approach and applying Lippmann diagrams with logarithmic <jats:italic>x</jats:italic>-axes revealed a log-linear decrease in aqueous Zn solubility. The results are promising for remediation of metal-bearing liquid wastes because the metals that co-precipitated with the LDH were more strongly retained and, therefore, less soluble than the hydroxides or carbonates of the trace metal.</jats:p>
Autoren
DOI
10.1007/s42860-021-00169-y
eISSN
1552-8367
ISSN
0009-8604
Ausgabe der Veröffentlichung
1
Zeitschrift
Clays and Clay Minerals
Sprache
en
Online publication date
2024
Paginierung
34 - 47
Datum der Veröffentlichung
2022
Status
Published
Herausgeber
Cambridge University Press (CUP)
Herausgeber URL
http://dx.doi.org/10.1007/s42860-021-00169-y
Datum der Datenerfassung
2024
Titel
Aqueous Solubility of Zn Incorporated into Mg-Al-Layered Double Hydroxides
Ausgabe der Zeitschrift
70

Datenquelle: Crossref

Author's licence
CC-BY
Autoren
Hosting institution
Universitätsbibliothek Mainz
Sammlungen
  • DFG-491381577-H
Resource version
Published version
DOI
10.1007/s42860-021-00169-y
Funding acknowledgements
  • Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 491381577
File(s) embargoed
false
Open access
true
ISSN
1552-8367
Zeitschrift
Clays and clay minerals
Schlüsselwörter
  • 550 Geowissenschaften
  • 550 Earth sciences
Sprache
eng
Open access status
Open Access
Paginierung
34 - 47
Datum der Veröffentlichung
2022
Public URL
https://openscience.ub.uni-mainz.de/handle/20.500.12030/8307
Herausgeber
Springer International Publishing
Datum der Datenerfassung
2022
Datum, an dem der Datensatz öffentlich gemacht wurde
2022
Zugang
Public
Titel
Aqueous solubility of Zn incorporated into Mg-Al-layered double hydroxides
Ausgabe der Zeitschrift
70

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