Isotherm and Kinetic Studies of Adsorption of Heavy Metals on to Ecchornia Crassipes

Environmental problems are increasing day by day due to rapid industrialization. Therefore there exists great demand for removing heavy metals from the waste water. Many methods were available from literature for removing heavy metals from wastewater out of which Bioadsorption using Biomass is found to be more economical and ecofriendly compared to physico–chemical methods. In the present work, Ecchornia crassipes is used as an adsorbent for removing heavy metals like Pb and Zn from waste water. Ecchornia crassipes which contains high content of lignin can have high metal binding capacity. The effect of various parameters like PH, Biomass Dosage, Initial Metal Ion Concentration and Temperature on metal biosorption was studied. Biosorption experimental data is well described by both Freundlich and Langmuir Isotherm models. The experimental data obtained is well suited with the pseudo second order kinetics.