Raman spectroscopy of hydrotalcites with phosphate in the interlayer- implications for the removal of phosphate from water

Frost, Ray L., Musumeci, Anthony W., Kloprogge, J. Theo, Adebajo, Moses O., & Martens, Wayde N. (2006) Raman spectroscopy of hydrotalcites with phosphate in the interlayer- implications for the removal of phosphate from water. Journal of Raman Spectroscopy, 37(7), pp. 733-741.

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Hydrotalcites with phosphate in the interlayer were prepared at different pH. At pH >11.0 (PO4)3- was the intercalated ionic species whereas at pH < 11.0 a mixture of (PO4)3- and (HPO4)2- ions was intercalated. Powder X-ray diffraction shows the hydrotalcite formed at pH 9.5 is poorly diffracting with a d-spacing of 11.9; whereas the d(003) spacing for the phosphate interlayered hydrotalcite formed at pH 11.9 and 12.5 were 8.0 and 7.9 Å. The addition of a thermally activated ZnAl-HT to a phosphate solution resulted in the uptake of the phosphate and the reformation of the hydrotalcite. Raman spectroscopy of the phosphate interlayered hydrotalcites shows the interlayered anion is pH dependent and only above pH 11.9 is the orthophosphate anion intercalated. At lower pH the monohydrogen phosphate anion is intercalated.
Raman spectroscopy shows that upon addition of the thermally activated hydrotalcite to an aqueous phosphate solution results in the uptake of phosphate anion from the solution.

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ID Code: 4760
Item Type: Journal Article
Refereed: Yes
Additional Information: This is one of a series of manuscripts on the use of thermally activated hydrotalcites for water purification. In this example phophate anions are removed from water.
Keywords: hydrotalcite, brucite, phosphate removal, Raman microscopy, carrboydite, hydrohonessite, takovite, mountkeithite
DOI: 10.1002/jrs.1500
ISSN: 0377-0486
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2006 John Wiley & Sons
Copyright Statement: The definite version is available on publication at www3.interscience.wiley.com
Deposited On: 04 Aug 2006 00:00
Last Modified: 29 Feb 2012 13:24

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