BIOSORPTION OF PB(II) IONS FROM AQUEOUS SOLUTION BY INACTIVE BIOMASS OF BACILLUS MEGATERIUM
Meenakshi Sati, Megha Verma, J.P.N. Rai
Abstract
In the present study, the biosorption capacity of dead cells of Bacillus megaterium has been assessed for the removal of Pb(II) ions from aqueous solution under different conditions of temperature regimes, pH, contact time and biosorbent dose. The biosorbent used in this study exhibited a good adsorption potential at initial pH 5 and temperature 300C. The equilibrium adsorption data was analyzed by the Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich (D-R) isotherm models. Freundlich isotherm was found more applicable in terms of relatively high regression values (R2 0.991). The energy of adsorption, E (12.936 KJ/mol) obtained from the D-R isotherm suggested a chemical ion exchange mechanism. The results of the kinetics studies revealed that the biosorption of Pb(II) ions on B. megaterium followed pseudo-second order kinetics.