Investigation of Kinetics and Equilibrium of Lead-Absorbing Process by Magnetic Activated Carbon Powder with Fe3O4 Nanoparticles from Aqueous Solutions

The combination of magnetic nanoparticles with other adsorbents not only does not affect their magnetic properties, but also leads to the formation of adsorbents that improve the refining process.The aim of this study was synthesis of magnetic activated carbon by Fe3O4 and investigating its efficiency in adsorption of Lead from aqueous solutions. Magnetic adsorbent prepared by the method of sequestration and physical characteristics and structure of synthesized absorbent were determined by XRD and TEM. To remove the Lead from aqueous solutions, the Box-behnken design (BBD) of response surface methodology (RSM) was employed for optimizing all parameters affecting the adsorption process. The studied parameters were pH(5-9), temperature (25-45 0C) and the amount of adsorbent (0.5-2 g). 15 experimental runs were calculated by using BBD. The optimal condition for removal of Lead by synthesis of magnetic activated carbon by Fe3O4 nanoparticles were pH=7, 450C temperature and The 2 g of adsorbent. Kinetic studies of the adsorption process specified the  efficiency of the pseudo second-order kinetic model and showed the optimal time was15 min, respectively. The maximum percentage of Lead removed after 90 min was 86.87%. The adsorption isotherm waswell fitted to Longmire model. The study showed that magnetic activated carbon has a high potential for Remove Lead. Therefore, it is believed that magnetized active carbon by keeping its physical and surface properties could be a suitable method to solve some related problems includingseparation and filtration.