AN ADSORPTIVE STUDY ON REMOVAL OF MALACHITE GREEN (MG) FROM AQUEOUS SOLUTION USING AN ECO- FRIENDLY BIOADSORBENT ACTIVATED PONGAMMIA PINNATA POD POWDER (AP4)

Abstract

The present investigation has been aimed to develop a cheap adsorption method for the removal of contaminants from wastewater using an eco-friendly bioadsorbent. Activated Pongammia pinnata pod powder (AP4) was used as an adsorbent which is extracted from ground shells of Pongammia pinnata pods (karanj tree). Systematic batch adsorption studies of Malachite Green (MG) on activated Pongammia pinnata pod powder (AP4) were carried using different parameters such as effect of initial adsorbate concentration, dose of adsorbent (AP4), pH, contact time and temperature. The adsorptive behaviour of MG onto AP4 was studied using Langmuir adsorption isotherm model. Thermodynamic analysis was also done to find out the nature of adsorption procedure. The estimated value of Gibb’s free energy ΔG° (-11.22×103) reveals spontaneous nature of the process which involves pseudo first order kinetics controlled by particle diffusion process and the positive value entropy (ΔS°) shows the randomness of the adsorption process.