The Structure and Thermal Properties of Solid Ternary Compounds Forming with Ca2+, Al3+ and Heptagluconate Ions

Ákos Buckó; Zsolt Kása; Márton Szabados; Bence Kutus; Ottó Berkesi; Zoltán Kónya; Ákos Kukovecz; Pál Sipos; István Pálinkó

doi:10.3390/molecules25204715

Molecules (Oct 2020)

The Structure and Thermal Properties of Solid Ternary Compounds Forming with Ca2+, Al3+ and Heptagluconate Ions

Ákos Buckó,
Zsolt Kása,
Márton Szabados,
Bence Kutus,
Ottó Berkesi,
Zoltán Kónya,
Ákos Kukovecz,
Pál Sipos,
István Pálinkó

Affiliations

Ákos Buckó: Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm sqr. 7, H-6720 Szeged, Hungary
Zsolt Kása: Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm sqr. 7, H-6720 Szeged, Hungary
Márton Szabados: Department of Organic Chemistry, University of Szeged, Dóm sqr. 8, H-6720 Szeged, Hungary
Bence Kutus: Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, D-55128 Mainz, Germany
Ottó Berkesi: Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich B. sqr. 1, H-6720 Szeged, Hungary
Zoltán Kónya: Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. sqr. 1, H-6720 Szeged, Hungary
Ákos Kukovecz: Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. sqr. 1, H-6720 Szeged, Hungary
Pál Sipos: Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm sqr. 7, H-6720 Szeged, Hungary
István Pálinkó: Department of Organic Chemistry, University of Szeged, Dóm sqr. 8, H-6720 Szeged, Hungary

DOI: https://doi.org/10.3390/molecules25204715
Journal volume & issue: Vol. 25, no. 20
p. 4715

Abstract

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In the present work, the structure and thermal stability of Ca–Al mixed-metal compounds, relevant in the Bayer process as intermediates, have been investigated. X-ray diffraction (XRD) measurements revealed the amorphous morphology of the compounds, which was corroborated by SEM-EDX measurements. The results of ICP-OES and UV-Vis experiments suggested the formation of three possible ternary calcium aluminum heptagluconate (Ca-Al-Hpgl) compounds, with the formulae of CaAlHpgl(OH)40, Ca2AlHpgl2(OH)50 and Ca3Al2Hpgl3(OH)90. Additional IR and Raman experiments revealed the centrally symmetric arrangement of heptagluconate around the metal ion. The increased thermal stability was demonstrated by thermal analysis of the solids and confirmed our findings.

Published in Molecules

ISSN: 1420-3049 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Organic chemistry
Website: http://www.mdpi.com/journal/molecules

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