Copper ions biosorption onto bean shells: kinetics, equilibrium, and process optimization studies

The removal of copper ions from aqueous solutions using bean shells as an adsorbent is presented in this paper. influence the solution pH on biosorption capacity was investigated. increased with increase pH. pseudo-second order kinetic model showed best agreement analyzed experimental data, indicating that chemisorption could be a possible way binding to surface shells. Langmuir isotherm fitted data. SEM-EDS analysis performed before and after process. change morphology sample process evident, whereby K, Mg, Si, Ca were possibly exchanged ions. Response Surface Methodology (RSM) based Box-Behnken design (BBD) used optimize process, selected factors: pH, initial concentration, contact time. optimum conditions determined be: = 3-4, concentration 100 mg dm-3, time 10-30 minutes.