Processes based on the use of iron-based nanoparticles (FeNPs) have proved to be a promiseing technology for the removal of a wide range of pollutants including metals and metalloids in water,being simple and low-cost procedures for removal of As(III)/As(V).FeNPs such as zerovalent iron nanoparticles (nZVI).nanoparticles of iron oxides (FeONPs) as hematite or magnetite,and iron-based nanoparticles prepared from natural extracts of plants or seeds (as yerba mate and green tea) have a larger surface area/volume ratio and exceptional adsorption properties compared with micro-or macrosized materials,with the advantages of an effective removal of pollutants at very low concentrations and a low generation of sludge.Laboratory experiments have been performed to evaluate the efficiency of some iron-based nanoparticles for removal of As(III)/(v) studying the influence of the initial concentration of the pollutant,the NP mass,the pollutan:FeNP molar ratio pH,the presence of O2,among other variables.In this presentation,a brief review on the use of FeNPs fo As removal from water and some results of our laboratory will be presented.
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