Sulfate intercalated layered double hydroxides prepared by the reformation effect |
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Authors: | Frederick L Theiss Sara J Palmer Godwin A Ayoko Ray L Frost |
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Institution: | (1) Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane Queensland, 4001, Australia; |
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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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