Remoción de Cr(VI) con nanopartículas basadas en hierro

KOZLOWSKI, N.; TRAID, H.D.; VERA, M.L.; LITTER, M.I.

Posadas

Jornada; VI Jornadas de Ciencia, Tecnología e Industria y VII Jornadas de Jóvenes Investigadores; 2023

Asociación Misionera de Estudiantes de Ingeniería Química

- Chromium is a heavy metal used in many industrial processes, mainly in the metallurgical industry for metal finishing and in the forestry industry for wood preservation.- The most abundant chromium species in water are Cr(III) and Cr(VI), the latter being the most dangerous, as it is a wellknown human carcinogen. The most widely used process for the treatment of Cr(VI) in water is its reduction to less toxic and mobile Cr(III) species.- A promising alternative for Cr(VI) removal from water is the use of iron (Fe)-based nanoparticles (NPs), such as nanoscale zerovalent iron (nZVI) NPs, or Fe nano-oxides such as nanomagnetite (nFe3O4) or nanomaghemite (nγ-Fe2O3), which promote oxidation-reduction reactions combined with adsorption and coprecipitation processes.- The most commonly used method for the synthesis of nZVI is the chemical reduction of Fe(II) or Fe(III) salts with sodium borohydride (NaBH4), a toxic and flammable compound.- However, in recent times, safer and environmentally friendly methods have been reported to obtain Fe-based nanoparticles by a green chemistry method (g-FeNPs) from natural plant extracts with high polyphenol content.