Evaluation of Layered Double Hydroxide Synthesised from a Green Biogenic Precursor for Phosphate Removal: Characterisations and Isotherms
American Journal of BioScience
Volume 5, Issue 2, March 2017, Pages: 13-24
Received: Feb. 8, 2017; Accepted: Mar. 13, 2017; Published: Mar. 22, 2017
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Authors
Ruth Olubukola Ajoke Adelagun, Department of Chemical Sciences, Federal University Wukari, Wukari, Nigeria
Nurudeen Abiola Oladoja, Department of Chemical Sciences, Adekunle Ajasin University, Akungba - Akoko, Ondo, Nigeria
Isaac Ayodele Ololade, Department of Chemical Sciences, Adekunle Ajasin University, Akungba - Akoko, Ondo, Nigeria
Adeniyi Samson Adeyemo, Department of Chemical Sciences, Adekunle Ajasin University, Akungba - Akoko, Ondo, Nigeria
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Abstract
CaCr LDH materials were synthesized by the co-precipitation method, using Gastropod shell as a biogenic source of Ca2+. The mineralogical, surficial morphology and elemental composition analysis of the materials showed characteristics typical of hydrotalcite-like materials, composed of Ca, Cr, O, C and Cl. Batch equilibrium adsorption studies showed that phosphate sorption on the LDH reached equilibrium within 5 min with about 98% removal. The sorption of phosphate was well described by the Langmuir isotherm model. The monolayer adsorption capacity of the CaCr LDH for phosphate was 142.86 mg/g. Mechanistic studies of phosphate removal by the LDHs was elucidated via instrumental analysis, vis-a viz, SEM-EDX, XRD and FTIR. Results revealed that phosphate was removed via the combination of ion exchange and precipitation. It could be inferred that CaCr LDH synthesised using Gastropod shell as a biogenic source of Ca2+ is a suitable adsorbent for phosphate removal from aqua system.
Keywords
Phosphate, Layered Double Hydroxide, Characterisation, Gastropod Shell, Isotherms
To cite this article
Ruth Olubukola Ajoke Adelagun, Nurudeen Abiola Oladoja, Isaac Ayodele Ololade, Adeniyi Samson Adeyemo, Evaluation of Layered Double Hydroxide Synthesised from a Green Biogenic Precursor for Phosphate Removal: Characterisations and Isotherms, American Journal of BioScience. Vol. 5, No. 2, 2017, pp. 13-24. doi: 10.11648/j.ajbio.20170502.11
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Copyright © 2017 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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