Water Science and Engineering 2020, 13(3) 202-213 DOI:   https://doi.org/10.1016/j.wse.2020.09.007  ISSN: 1674-2370 CN: 32-1785/TV

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Almond husk
Cobalt ferrite
Equilibrium study
Heavy metals
Error analysis

Characterization of cobalt ferrite-supported activated carbon for removal of chromium and lead ions from tannery wastewater via adsorption equilibrium

Muibat Diekola Yahya a, Kehinde Shola Obayomi b,*, Mohammed Bello Abdulkadir a, Yahaya Ahmed Iyaka c, Adeola Grace Olugbenga a

a Department of Chemical Engineering, Federal University of Technology, Minna,  P. M. B. 65,  Nigeria
b Department of Chemical Engineering, Landmark University, Omu-Aran,  P. M. B. 1001, Nigeria
c Department of Chemistry, Federal University of Technology, Minna, P. M. B. 65, Nigeria


In this experiment, cobalt ferrite-supported activated carbon (CF-AC) was developed and characterized via the wet impregnation method for the removal of Cr and Pb(II) ions from tannery wastewater. Batch adsorption was carried out to evaluate the effect of experimental operating conditions (pH of solution, contact time, adsorbent dose, and temperature), and the removal efficiencies of Cr and Pb(II) ions by the developed adsorbents were calculated and recorded for all experimental conditions. These variables were estimated and reported as removal efficiencies of 98.2% for Cr and 96.4% for Pb(II) ions at the optimal conditions of 5, 0.8 g, 80 min, and 333 K for pH, adsorbent dose, contact time, and temperature, respectively. The equilibrium for the sorption of Cr and Pb(II) ions was studied using four widely used isotherm models (the Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherm models). It was found that the Freundlich isotherm model fit better with the coefficient of determination (R2) of 0.948 4 and a small sum of square error of 0.000 6. The maximum adsorption capacities (Qm) of Pb(II) and Cr adsorbed onto CF-AC were determined to be 6.27 and 23.6 mg/g, respectively. The adsorption process conformed well to pseudo-second order kinetics as revealed by the high R2 values obtained for both metals. The thermodynamic parameters showed that adsorption of Cr and Pb(II) ions onto CF-AC was spontaneous, feasible, and endothermic under the studied conditions. The mean adsorption energy (E) values revealed that the adsorption mechanism of Cr and Pb(II) by CF-AC is physical in nature. The results of the study showed that adsorbent developed from CF-AC can be efficiently used as an environmentally friendly alternative adsorbent, for removal of Cr and Pb(II) ions in tannery wastewater.

Keywords Almond husk   Cobalt ferrite   Equilibrium study   Heavy metals   Error analysis  
Received 2020-02-13 Revised 2020-07-20 Online: 2020-09-30 
DOI: https://doi.org/10.1016/j.wse.2020.09.007
Corresponding Authors: Kehinde Shola Obayomi
Email: Obayomi.kehinde@lmu.edu.ng
About author:


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