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Investigation on the removal of entacapone from contaminated water using magnetic activated carbon

The adsorption of Entacapone (ENT) on activated carbons (AC) was studied. AC was prepared from pomegranate wood and Modified by NH4Cl (NAC). To solve the problems of separating powder activated carbon (PAC) from the aquatic system after the end of the treatment process, the PAC magnetized by iron nanoparticle. In this work, kinetics, equilibrium, and other adsorption properties such as pH, agitation speed, adsorbent dose, contact time, and temperature were investigated. The optimum conditions for the removal in aqueous solution containing 50 mg l−1 of ENT were a pH of 6.0, 0.16 g l−1 of magnetic NH4Cl-induced activated carbon (MNAC), and stirring speed of 150 rpm. The Results of equilibrium isotherms show that the adsorption process is more compatible with Langmuir model and maximum adsorption capacity was 1666.67 mg g−1. Applying the pseudo first- and second-order and Weber-Morris kinetic models indicated that the adsorption processes are well described by the pseudo-second-order model. The results demonstrated that the MNAC is very effective to remove ENT from aqueous solutions.