Synthesis and Characterization of Goethite Nanostructured powder: Application in the Simultaneous Removal of Co(II) and
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.527
Synthesis and Characterization of Goethite Nanostructured powder: Application in the Simultaneous Removal of Co(II) and Ni(II) Ions from Aqueous Solution C.R. Nangah1,2, T.G. Merlain2, N.J. Nsami2, C.P. Tubwoh1, K.J. Mbadcam2, D. Dodoo-Arhin3 1
Department of Chemistry, University of Buea, Buea; Cameroon Physical and Theoretical Chemistry Laboratory, Department of Inorganic Chemistry, University of Yaounde I, Yaounde, Cameroon 3 Department of Materials Science and Engineering, University of Ghana, Accra-Ghana
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Abstract: This study investigates the adsorption efficiency of goethite nanostructured powder for the simultaneous removal of cobalt and nickel ions. The nanostructured powder sample was synthesized via a chemical precipitation technique and characterized using SEM, FTIR-ATR and XRD techniques. From batch adsorption studies, maximum absorption for Co(II) and Ni(II) ions occurred at an equilibrium contact time of 80 min, with an adsorbent mass of 0.1 g, and at pH=7. Co(II) ions showed greater affinity to the nanoparticles as compared to Ni(II). The maximum quantities adsorbed were recorded as 148.5 mg/g for Co(II) and 110.6 mg/g for Ni(II) ions. The best isotherm model fit for both metal ions was the Freundlich model indicating heterogeneity of the surface binding sites. The pseudo-second order kinetic model was the best-fit model: an indication of a strong chemical adsorption between the adsorbent surface and metal ions. The findings show that the goethite nanostructured powder is a very effective adsorbent material and prominent candidate for the simultaneous removal of cobalt and nickel ions from water. Corresponding Author: Nangah Che Randy, [email protected] 1. INTRODUCTION Nanotechnology has great potential for providing efficient, cost-effective, and environmentally acceptable solutions for improving water quality [1]. Nanoparticles have much larger surface areas than bulk particles and are ideal building blocks for developing high-capacity sorbents with the ability to be functionalized to enhance their affinity and selectivity [2, 3, 4, 5]. Hydrated iron oxide nanoparticles are nontoxic, inexpensive, readily available and chemically stable over a wide pH range [6]. They can be synthesized by all known wet chemical methods, e.g. chemical
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precipitation [7], micro-emulsion precipitation [8] sol gel [9]. Goethite (α-FeOOH) is the most common iron oxyhydroxide in soils [10, 11], sediments and ore deposits, as well as a common weathering product in rocks of all types [12]. Given its affinity to adsorb various contaminants: anions, organic acids, and cations including hea vy metal ions, goethite represents an important component of environmental remediation process [13, 14]. This is highligh
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