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Using thermally activated hydrotalcite for the uptake of phosphate from aqueous media

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Abstract

Hydrotalcites of formula Mg6A12(OH)16(PO4)·4H2O formed by intercalation with the phosphate anion as a function of pH show variation in the d-spacing attributed to the size of the hydrated anion in the interlayer. The value changes from 11.91 Å for pH 9.3, to 7.88 Å at pH 12.5. No crystalline hydrotalcites with phosphate in the interlayer were formed at pH 9.3. Thermal decomposition identifies three steps namely dehydration, dehydroxylation and some loss of carbonate during the thermal treatment. 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. The technology has the potential for water purification through anion removal.

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Authors and Affiliations

  1. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland, 4001, Australia

    R. L. Frost, A. W. Musumeci, M. O. Adebajo & W. Martens

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  1. R. L. Frost
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  2. A. W. Musumeci
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  3. M. O. Adebajo
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  4. W. Martens
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Correspondence to R. L. Frost.

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Frost, R.L., Musumeci, A.W., Adebajo, M.O. et al. Using thermally activated hydrotalcite for the uptake of phosphate from aqueous media. J Therm Anal Calorim 89, 95–99 (2007). https://doi.org/10.1007/s10973-005-7478-x

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  • DOI: https://doi.org/10.1007/s10973-005-7478-x

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