Adsorption of Metal Cations by Anion Clay Hydrotalcite

Townsend, Warwick (2001). Adsorption of Metal Cations by Anion Clay Hydrotalcite Honours Thesis, School of Engineering, The University of Queensland.

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Author Townsend, Warwick
Thesis Title Adsorption of Metal Cations by Anion Clay Hydrotalcite
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2001
Thesis type Honours Thesis
Supervisor H.Y. Zhu
Total pages 40
Language eng
Subjects 0904 Chemical Engineering
Formatted abstract
Government effluent limits as well as ever increasing public awareness of environmental issues make treating industrial wastewater more important today than it has ever been. Heavy metals are one of the major classes of pollutants in wastewater due to their toxicity and cumulative effects. A large number of industries produce effluent contaminated by heavy metals. This study has shown that anion clay hydrotalcite is an effective adsorbent of metal cations in aqueous solution. Little research has been completed in the area of adsorption of metal cations by anion clays. As such this study was limited by the fact that relevant parameters were not present in literature.

Hydrotalcite was synthesised and its structure determined using x-ray diffraction. Half of the synthesised clay was calcined and then bottle-point adsorption tests were performed for Cr(III), Pb 2+ and Zn 2+ ions with both regular and calcined hydrotalcite.

It was found that hydrotalcite is an effective adsorbent of the metal cations tested with greater adsorption from solution by calcined hydrotalcite than regular hydrotalcite. There was an average metal ion uptake of 83% for regular hydrotalcite and 94% for calcined hydrotalcite.

X-ray diffraction of clay samples recovered after adsorption showed that hydrotalcite retained its crystalline structure, however some metal salts were found to have precipitated from solution in some cases, influencing adsorption rates. This study has shown that hydrotalcite is an effective adsorbent for the removal of metal cations from aqueous solution.
Keyword Adsorption of Metal Cations

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Thu, 08 Jan 2015, 14:22:38 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service