Olugbenga Solomon Bello
Ladoke Akintola University of Technology, Nigeria
Olugbenga Solomon Bello has completed his PhD in 2008 from the prestigious University of Ibadan in Nigeria. He has completed his Postdoctoral and Visiting Scholar Fellowships at Universiti Sains Malaysia in 2011 and 2014 respectively. He has published over sixty (60) papers in reputable and peer reviewed journals. He is an Associate Professor of Physical Chemistry in the Department of Pure and Applied Chemistry, LAUTECH, Ogbomoso, Oyo State, Nigeria.
The adsorptive potential of activated carbon prepared by chemical activation of cocoa pod husk (CPHAA) to remove Congo red (CR) dye from its aqueous solution was investigated in this study. CPHAA was characterized using Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Micrograph (SEM) and Energy Dispersive X-Ray (EDX) techniques respectively. The effects of contact time, initial dye concentration and solution temperature were studied. Equilibrium data were fitted to Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models. The equilibrium data were best represented by Langmuir isotherm model with maximum monolayer adsorption capacity of 43.67 mg/g. The kinetic data were fitted to Pseudo-first-order, Pseudo-second-order, Elovich and Intra particle diffusion models; the pseudo-second-order kinetic model provided the best correlation. Thermodynamic parameters such as standard enthalpy (ΔHO), standard entropy (ΔSO) and standard free energy (ΔGO) were evaluated. The thermodynamic study showed that the process is endothermic, spontaneous and feasible. The mean free energy of adsorption shows that the mechanism is by physisorption. CPHAA was found to be an effective adsorbent for the removal of CR dye from aqueous solution.