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.
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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|Item Type:||Journal Article|
|Keywords:||Sulfate, layered double hydroxide, hydrotalcite, powder x-ray diffraction, thermogravimetric analysis, water purification|
|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
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|Deposited On:||20 Feb 2012 22:39|
|Last Modified:||06 May 2014 00:32|
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