Mathematical modeling of the adsorption of trivalent chromium by the sodium polyacrylate beads

The objective of this work is thus to study the kinetics and adsorption isotherms of chromium (iii) on a superabsorbent polymer pana (sodium polyacrylate). in first,the study of some parameters like contact time and metal concentration,show that the extraction efficiency reaches 80% at a concentration of chromium equal to 4 mg/l. the extraction equilibrium time decreases from 60 mn for 4 mg/l to 30 mn for raised concentrations of cr(iii). in a second step,the study of the kinetics show that the adsorption of cr(iii) onto pana from aqueous solution is well described by the pseudo-second order kinetic model (the correlation coefficient r2>0.98). the adsorption isotherms of the adsorbent/adsorbate systems studied are described satisfactorily by the mathematical model of langmuir. furthermore,the isotherm study revealed that the adsorption is spontaneous and is carried out in monolayer. © 2017 university of mohammed premier oujda morocco.