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)
| Autor: | A. Acosta-Rangel, Antonio J. Mota, M. Rozalen, A.M.S. Polo, J. Rivera-Utrilla, M. Sánchez-Polo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:Hydraulic engineering
water contaminants Radical Iron Cytotoxicity Geography Planning and Development Sulfamethizole 02 engineering and technology 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry Advanced oxidation technologies Hydroxylation chemistry.chemical_compound lcsh:Water supply for domestic and industrial purposes sulfite iron Sulfite lcsh:TC1-978 Oxidation state sulfonamides medicine Response surface methodology 0105 earth and related environmental sciences Water Science and Technology lcsh:TD201-500 Sulfonamides Aqueous solution Water contaminants 021001 nanoscience & nanotechnology chemistry advanced oxidation technologies cytotoxicity Degradation (geology) 0210 nano-technology Nuclear chemistry medicine.drug |
| Zdroj: | Digibug. Repositorio Institucional de la Universidad de Granada instname Water Volume 11 Issue 11 Water, Vol 11, Iss 11, p 2332 (2019) |
| Popis: | This study is focused on advanced oxidation technologies (AOTs) using the combined effect of Fe(0&ndash VI)/sulfite systems, that produce mainly SO4&bull &minus radicals, to remove different 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&rsquo 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&rsquo removal percentage when using ground water. This is probably due to the presence of different anions, such as HCO3&minus Cl&minus and SO42&minus 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|