Synthesis, Characterization, and Adsorption Kinetic Studies of Ethylenediamine Modified Cellulose for Removal of Cd and Pb

Abstract

Surface functionalization of cellulose using ethylenediamine was performed to improve its binding capacity for Cd and Pb. Adsorption kinetics at pH 6.0 and 25°C revealed the Langmuir model to better describe the binding phenomena based on linear regression correlation coefficient (R2) values of 0.998 and 0.986 with adsorption capacities of 0.0136 and 0.0179 mmol g−1 for Cd and Pb, respectively, using raw cellulose and 0.128 and 0.242 mmol g−1 with ethylenediamine-modified cellulose. The Freundlich model gave binding capacities of 2.32 × 10−3 and 2.08 × 10−3 mmol g−1 for Cd and Pb, with R2 values of 0.979 and 0.942, respectively.