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Synthesis and characterization of MgCo2O4 nanoparticles: Application to removal of Ni2+ in aqueous solution by adsorption
•MgCo2O4 is prepared by a facile nitrate route exhibits a high adsorption capacity for Ni2+ and this is what is new .•XRD, FTIR, SEM, EDS, XPS, BET and Zeta analysis are used to explore the sorption mechanism.•the study accounts for 99.9% of Ni2+ adsorption.•It has the advantages of low cost, easy s...
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Published in: | Journal of alloys and compounds 2022-06, Vol.907, p.164498, Article 164498 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | •MgCo2O4 is prepared by a facile nitrate route exhibits a high adsorption capacity for Ni2+ and this is what is new .•XRD, FTIR, SEM, EDS, XPS, BET and Zeta analysis are used to explore the sorption mechanism.•the study accounts for 99.9% of Ni2+ adsorption.•It has the advantages of low cost, easy separation and has great adsorption quality after continuous cycles (adsorption / desorption).
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The present study is based on the adsorption of Ni2+ in aqueous solution on the spinel MgCo2O4 synthesized by nitrate route, followed by calcination at 500 °C. The powder was characterized by X-ray diffraction (XRD), FTIR spectroscopy, SEM/EDX analysis and specific surface area. It crystallizes in a cubic symmetry (Space Group: Fd-3m) and the SEM image shows hexagonal-shaped grains with visible porosity. The effects of the initial Ni2+ concentration, catalyst dose, temperature and pH were investigated. The optimization was found for 0.5 g/ L, 25 mg/ L, pH ∼ 6 and 50 °C respectively with a maximum efficiency of 99%. The experimental data were analysed by different isotherms. The Langmuir model indicates a better representation with a high adsorption capacity of 140 mg/g and a correlation coefficient (R²) of 0.99, thus showing that MgCo2O4 is an efficient adsorbent for the Ni2+ recovery. The kinetic data are well fitted by the pseudo second-order model. The positive zeta potential leads to a high adsorption capacity. The thermodynamic parameters revealed that the Ni2+ adsorption on the spinel is endothermic (ΔH° = 27.236 kJ/ mol) and spontaneous (ΔG° = −2.045 kJ/ mol). The spinel is regenerated with diluted HCl solution without noticeable loss of adsorption quality after continuous cycles (adsorption / desorption). |
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ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2022.164498 |