Investigation of Methylene Blue Adsorption in Water Solution Using Modified Magnetic Fe3O4 by Guanidine

In this study, magnetic nanoparticle supported by guanidine was synthesized, and its property was investigated in adsorption of methylene blue from wastewater samples. Physical and structural characteristics of the adsorbent were investigated by SEM, TEM, and FTIR techniques. The effect of pH, initial concentration of methylene blue and adsorbent, contact time, and temperature were investigated to determine equilibrium isotherms, and kinetics of adsorption process. The optimum conditions of adsorbent were: pH=6, contact time=30min, adsorbent dose of 2.5 g/L and room temperature. The equilibrium isotherm study showed that the adsorption process was fitted by Langmuir model and the adsorption kinetic a good compliance with pseudo second-order model. The present study showed that the magnetic nanoparticle supported by guanidine has high potential for adsorption of methylene blue, in addition to features like simple and rapid separation. Therefore, it can be used for adsorption and separation of such pollutants from aqueous solutions.