Comparative Study of the Oxidative Degradation of Different 4-Aminobenzene Sulfonamides in Aqueous Solution by Sulfite Activation in the Presence of Fe(0), Fe(II), Fe(III) or Fe(VI)
Metadatos
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Acosta Rangel, Aurora; Sánchez Polo, Manuel; Rivera Utrilla, José; Rozalen, María; Polo, A. M. S.; Mota Ávila, Antonio JoséEditorial
MDPI
Materia
Advanced oxidation technologies Sulfite Iron Water contaminants Sulfonamides Cytotoxicity
Fecha
2019-11-07Referencia bibliográfica
Acosta-Rangel, A., Sánchez-Polo, M., Rozalen, M., Rivera-Utrilla, J., Polo, A. M. S., & Mota, A. J. (2019). Comparative Study of the Oxidative Degradation of Different 4-Aminobenzene Sulfonamides in Aqueous Solution by Sulfite Activation in the Presence of Fe (0), Fe (II), Fe (III) Or Fe (VI). Water, 11(11), 2332.
Patrocinador
This research was funded by both Ministry of Science and Innovation of Spain, grant number CTQ2016-80978-C2-1-R, and CONACyT (Mexico), grant number 407494.Resumen
This study is focused on advanced oxidation technologies (AOTs) using the combined
effect of Fe(0–VI)/sulfite systems, that produce mainly SO4 radicals, to remove di erent
4-aminobenzene sulfonamides (SAs), namely sulfamethazine, sulfadiazine, sulfamethizole, from
aqueous solutions. Results obtained showed that neither sulfite nor iron alone is able to degrade
SAs; however, the combined effect depends on the oxidation state of iron species whose effectiveness
to activate sulfite to promote the degradation of SAs increased following this order: Fe(III) < Fe(II)
< Fe(0) < Fe(VI). Using Fe(VI)/sulfite, the complete removal of SAs was obtained in 5 min largely
surpassing the effectiveness of the other three systems. The sulfonamides’ removal percentage was
markedly influenced by sulfite concentration and dissolved oxygen, which improved the generation
of oxidant radicals. Response surface methodology was applied, and a quadratic polynomial model
was obtained, which allowed us to determine the percentage of SAs degradation as a function of
both the iron species and sulfite concentrations. The study of the influence of the water matrix on
these AOTs revealed an inhibition of SAs’ removal percentage when using ground water. This is
probably due to the presence of different anions, such as HCO3
-, Cl-, and SO4
2- in relatively high
concentrations. According to the byproducts identified, the proposed degradation pathways include
hydroxylation, SO2 extrusion, and different bond-cleavage processes. Cytotoxicity of degradation
byproducts, using MTS assay with HEK 293 and J774 cell lines for the first time, did not show an
inhibition in cell proliferation, sustaining the safety of the process.