Adsorptive removal of methyl orange from wastewaters by the commercial anion exchange membrane EPTAC

In this manuscript, we have utilized the commercially available anion exchange membrane EPTAC for the adsorptive removal of methyl orange (MO) dye from wastewater via batch mode at room temperature. The percentage removal of MO was increased from 26.10% to 98.70% with the contact time, and from 48.04% to 98.70% with the amount of adsorbent (membrane dosage). On the other hand, the percentage removal of MO was decreased with an initial concentration of dye aqueous solution, temperature and ionic strength. Adsorption kinetics evaluation showed that experimental data for adsorption of MO onto the commercial anion exchange membrane EPTAC fitted-well to pseudo-second-order model because the value of correlation coefficient (R-2) was very close to unit (R-2 > 0.995). Several nonlinear isotherms containing two parameters and three parameters isotherms were applied on experimental data of MO adsorption onto the commercial anion exchange membrane EPTAC. Results demonstrated that adsorption MO onto the commercial anion exchange membrane EPTAC fitted well to nonlinear Freundlich isotherm with the lower value of chi-square (chi(2) = 2.22 x 10(-9)) Moreover, adsorption thermodynamics of MO adsorption onto the commercial anion exchange membrane EPTAC was also evaluated in detail. The negative value of enthalpy of the system (Delta H degrees = -68.93 kJ/mol) showed that adsorption of MO onto the commercial anion exchange membrane EPTAC was an exothermic process.