Kinetics, equilibrium and thermodynamics investigation on the adsorption of cr (vi) ions from wastewater using activated kigelia africana rind nano carbon

Abstract

The goal of this research is to investigate the feasibility of using activated Kigelia africana rind nano carbon (KANC) to adsorb Cr (VI) ions from aqueous solutions through batch experiments. Effect of contact time, initial Cr(VI) ion concentration, activated KANC dose, initial solution pH, other ions and temperature on the Cr (VI) ions adsorption were examined. The sorption process was examined by applying Elovich, pseudo-second order and intraparticle diffusion rate.  The best pH for Cr (VI) ions removal is in the range of 2.0-7.0 with more than 80-85% of Cr (VI) ions removed. The equilibrium time was found to be 45min and the adsorption data followed the pseudo-second-order kinetics. Isotherm data followed Langmuir isotherm model. The adsorption was endothermic and spontaneous in nature.