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Sulfate intercalated layered double hydroxides prepared by the reformation effect

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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 1000 ppm 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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Acknowledgements

The financial and infra-structure support of the Chemistry Discipline of the Faculty of Science and Technology, Queensland University of Technology is gratefully acknowledged. The Australian Research Council (ARC) is thanked for funding the instrumentation.

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Authors and Affiliations

  1. Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane Queensland, 4001, Australia

    Frederick L. Theiss, Sara J. Palmer, Godwin A. Ayoko & Ray L. Frost

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  1. Frederick L. Theiss
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  2. Sara J. Palmer
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  3. Godwin A. Ayoko
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  4. Ray L. Frost
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Correspondence to Ray L. Frost.

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Theiss, F.L., Palmer, S.J., Ayoko, G.A. et al. Sulfate intercalated layered double hydroxides prepared by the reformation effect. J Therm Anal Calorim 107, 1123–1128 (2012). https://doi.org/10.1007/s10973-011-1369-0

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