The Agro-based nutraceutical industrial Pterocarpus Marsupiumspent (NIPMS) adsorbent used to adsorb a cationic dye, Malachite Green (MG) from aqueous solution. The influence of initial dye concentration, pH, temperature, adsorbent dosage and particle size on dye adsorption was studied. The experimental equilibrium data obtained were analyzed by isotherm models of Langmuir, Freundlich. The experimental value of the adsorption capacity, qe was 45mg/g. The models applied for adsorption kinetic studies fitted well to a pseudo-second order model. The thermodynamic parameter values like ΔGº, ΔHº and ΔSº proved that the process of adsorption was exothermic. The FTIR spectra and images of SEM proved the MG being adsorbed onto NIPMS. Possible interaction that occurred in the MG-NIPMS system is discussed. NIPMS is an effective adsorbent to remove MG dye from aqueous solution.
