Equilibrium, kinetic and thermodynamic study on copper (ii) removal from aqueous solution using Strychnos nux-vomica

Author(s): Arivoli S*, V. Marimuthu, A.R. Mohamed Jahangir

Abstract

The effective and economic removal of heavy metals from industrial effluents is one of the important issues globally. The present study proposed the use of Activated Strychnos nux-vomica L in the removal of Cu (II), ions from synthetic aqueous solutions. Batch adsorption experiments were carried to fix the adsorption dosage and also to find the optimum pH. Batch adsorption studies showed that Activated Strychnos nux-vomica L was able to adsorb Cu (II) ions from aqueous solutions in the concentration range 25–125 mg/L. The adsorption was favored with maximum adsorption at pH 6.5, whereas the adsorption starts at pH 2 for Cu (II) ions. The effects of contact time, initial concentration of Cu (II) ions, adsorbent dosage and temperature have been reported. The applicability of Langmuir and Freundlich isotherm was tried for the system to completely understand the adsorption isotherm processes. The adsorption kinetics tested with pseudo-first-order and pseudo-second-order models yielded high R2 values from0.850 to 0.932 and from0.991 to 0.999, respectively. The Activated Strychnos nux-vomica L. was found to be cost effective and has good efficiency to remove these toxic Cu (II) ions from aqueous solution.

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