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Sulfate intercalated layered double hydroxides prepared by the reformation effect

Theiss, Frederick, Palmer, Sara J., Ayoko, Godwin A., & Frost, Ray L. (2011) Sulfate intercalated layered double hydroxides prepared by the reformation effect. Journal of Thermal Analysis and Calorimetry, 107, pp. 1123-1128.

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Abstract

The removal of the sulfate anion from water using synthetic hydrotalcite (Mg/Al LDH) was investigated using powder x-ray diffraction (XRD) and thermogravimetric analysis (TG). Synthetic hydrotalcite Mg6Al2(OH)16(CO3)∙4H2O was prepared by the co-precipitation method from aluminum and magnesium chloride salts. The synthetic hydrotalcite was thermally activated to a maximum temperature of 380°C. Samples of thermally activated hydrotalcite where then treated with aliquots of 1000ppm sulfate solution. The resulting products where dried and characterized by XRD and TG. Powder XRD revealed that hydrotalcite had been successfully prepared and that the product obtained after treatment with sulfate solution also conformed well to the reference pattern of hydrotalcite. The d(003) spacing of all samples was found to be within the acceptable region for a LDH structure. TG revealed all products underwent a similar decomposition to that of hydrotalcite. It was possible to propose a reasonable mechanism for the thermal decomposition of a sulfate containing Mg/Al LDH. The similarities in the results may indicate that the reformed hydrotalcite may contain carbonate anion as well as sulfate. Further investigation is required to confirm this.

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ID Code: 48760
Item Type: Journal Article
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Keywords: Sulfate, layered double hydroxide, hydrotalcite, powder x-ray diffraction, thermogravimetric analysis, water purification
DOI: 10.1007/s10973-011-1369-0
ISSN: 1572-8943 (online) 1388-6150 (print)
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Springer
Copyright Statement: The Author is entitled, however, to self-archive the preprint version of his/her manuscript. The preprint version is the Author’s manuscript or the galley proof or the Author’s manuscript along with the corrections made in the course of the peer review process. The Author’s right to self-archive is irrespective of the format of the preprint (.doc, .tex., .pdf) version and self-archiving includes the free circulation of this file via e-mail or publication of this preprint on the Author’s webpage or on the Author’s institutional repository with open or restricted access. When self-archiving a paper the Author should clearly declare that the archived file is not the final published version of the paper, he/she should quote the correct citation and enclose a link to the published paper (http://dx.doi.org/[DOI of the Article without brackets]).
Deposited On: 21 Feb 2012 08:39
Last Modified: 06 May 2014 10:32

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