Abstract
A natural clay was used as low-cost adsorbent for simultaneous removal of Ni(II) ions and methylene blue (MB) dye from an aqueous solution. FTIR, XRD and SEM analysis were used to characterize the adsorbent. Batch adsorption methodology was used to evaluate the effect of solution pH, initial pollutants concentration and contact time on adsorption performance.The equilibrium isotherm data was analyzed using the Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D-R) isotherm model. The Freundlich isotherm model provided the best fit to the experimental data for both pollutants as indicated by the values of the regression coefficient. The kinetic data was analyzed using pseudo-first order, pseudo-second order, Elovich equation and intraparticle diffusion rate equation. The pseudo-second-order model was found to explain the adsorption kinetics most effectively to the experimental data for both pollutants. The presence of intraparticle diffusion mechanism was indicated, although it was not the sole rate determining step. It was concluded that natural clay is an effective adsorbent for removal for simultaneous removal of Ni(II) ions and methylene blue (MB) dye from aqueous solution.
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