Kinetic and thermodynamic study of cd~(2+) adsorption onto rubber tree (hevea brasiliensis) leaf powder

摘要

A batch adsorption system was applied to study the adsorption of Cd~(2+) ions from aqueous solution by Hevea Brasiliensis, HB leaf powder. The adsorption capacities and rates of Cd~(2+) ions onto HB leaf powder were evaluated. Langmuir and Freundlich models were applied to describe the isotherms and isotherms constants. Equilibrium data agreed well with the Freundlich model. The kinetic experimental data correlated well with the pseudo-second-order kinetic model, indicating that the chemical sorption was the rate-limiting step.