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Kinetics and Equilibrium Models for Sorption of Cu(II) onto a Novel Manganese Nano-adsorbent
Authors:Oluwasogo Adewumi Dada  Folahan Amoo Adekola  Ezekiel Oluyemi Odebunmi
Institution:1. Department of Physical Sciences, Industrial Chemistry Programme, Landmark University, Omu-Aran, Nigeriadada.oluwasogo@lmu.edu.ng;3. Department of Industrial Chemistry, University of Ilorin, Ilorin, Nigeria;4. Department of Chemistry, University of Ilorin, Ilorin, Nigeria
Abstract:The studies of kinetics and equilibrium sorption of Cu(II) were undertaken using nanoscale zerovalent manganese (nZVMn) synthesized by chemical reduction in a single pot system. nZVMn was characterized using scanning electron microscopy, energy dispersive x-ray, and surface area determined by Brunauer–Emmett–Teller. The effect of pH, contact time, adsorbent dose, agitation speed, initial Cu(II) concentrations, temperature, and ionic strength on the sorption of Cu(II) onto nZVMn were investigated in a batch system. The kinetic data followed pseudo-second-order. The mechanism was governed by pore diffusion. The equilibrium sorption data were tested by Freundlich, Langmuir, Temkin, Dubinin–Kaganer–Raduskevich, and Halsey isotherm models. The Langmuir monolayer adsorption capacity (Qmax = 181.818 mg/g) is much greater compared to other nano-adsorbents used in sorption of Cu(II). The thermodynamic parameters (ΔH0, ΔS0, ΔG0) revealed a feasible, spontaneous, and endothermic adsorption process. nZVMn has a great potential for effective removal of copper (II) in aqueous solution.
Keywords:Adsorption  copper  kinetics  manganese nanoparticles  salinity  spontaneous
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