This work iscarried out based on the importance of the enormous consumption of water, which is obliged to comply with current regulations for the use to which it is intended. Because the arsenic is a toxic element and exposure to it, even in small amounts, can cause serious health problems, the water supplied to the services must comply with the maximum permissible limits. Therefore, it will use two iron oxide nanoparticles that allow the elimination of said pollutant and, in turn, the nanoparticles will be recovered through the application of a magnetic field for its regeneration and subsequent reuse, determining its life cycle. By establishing the optimal adsorption conditions for each of the nanoparticles, the removal of arsenic in a contact device water – nanoparticles – magnetic field using only the most efficient nanoparticles and the use wastewater treated real will be carried out.