Abstract

Biosorption of Pb(II) ions from aqueous solutions by Caesalpinia bonducella leaf powder (CBLP) was
investigated as a function of initial pH, biosorbent dose, initial metal ion concentration and temperature. The
FTIR spectrum shows the involvement of different functional groups (hydroxyl, amine, carboxyl and carbonyl
groups) in Pb(II) biosorption. Kinetic data were best fitted with the pseudo-second-order kinetic model. The
batch equilibrium data were fitted well by Langmuir isotherm. The monolayer maximum biosorption capacity,
calculated from Langmuir isotherm model, was found 116.27 mg/g at 323 K.