Examinando por Autor "Rynkowski, J.M."

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    Decolorization and mineralization of yellow 5 (E102) by UV/Fe2+/H2O2 process. Optimization of the operational conditions by response surface methodology
    (Elsevier Masson SAS, 2015-10-01) GilPalvas, E.; Gómez, C.M.; Rynkowski, J.M.; Dobrosz-Gómez, I.; Gómez-García, M.Á.; GilPalvas, E.; Gómez, C.M.; Rynkowski, J.M.; Dobrosz-Gómez, I.; Gómez-García, M.Á.; Universidad EAFIT. Departamento de Ingeniería de Procesos; Procesos Ambientales (GIPAB)
    In this study, the optimization and implementation of a homogeneous photo-Fenton process for the decolorization and mineralization of a wastewater containing highly concentrated yellow 5 (E102) dye, resulting from an industry placed in the suburbs of Medellin (Colombia), is presented. Response surface methodology was applied as a tool for the optimization of operational conditions such as initial dyestuff concentration. H2O2 concentration, and UV-radiation power (number of lamps). The decolorization, degradation and mineralization efficiencies were used as response variables. The following conditions were found to be optimal for decolorization and mineralization of yellow 5:UV radiation of 365 nm (4W. one lamp), dye concentration of 200 mg/L, Fe2+ concentration of 1.0 mM, H2O2 concentration of 1.75 mL/L, treatment time of 180 min, Fe2+ concentration of 1 mM and pH = 3. Under these conditions (180 min), the photo-Fenton process allowed us to reach ca. 100% of color dye degradation, 99% of COD degradation, and 85% of mineralization (TOC). The scavenging effect of the CI- anion on the photodegradation process was also confirmed. (C) 2015 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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    Transition metal loaded TiO2 for phenol photo-degradation
    (Elsevier Masson SAS, 2015-10-01) Dobrosz-Gómez, I.; Gómez-García, M.Á.; López Zamora, S.M.; Gilpavas, E.; Bojarska, J.; Kozanecki, M.; Rynkowski, J.M.; Dobrosz-Gómez, I.; Gómez-García, M.Á.; López Zamora, S.M.; Gilpavas, E.; Bojarska, J.; Kozanecki, M.; Rynkowski, J.M.; Universidad EAFIT. Departamento de Ingeniería de Procesos; Procesos Ambientales (GIPAB)
    Photocatalytic degradation of phenol under both UV radiation and visible light, using TiO2 (Degussa P-25) and TiO2 loaded with some transition metal ions (Co, Cu, Fe and Mo) was examined. From the series of metal loaded catalysts, Mo/TiO2 was the most efficient one. In the presence of Mo, neither TiO2 anatase/rutile fraction nor its pore size diameter has been affected. However. Mo made its surface more acidic. The percentage of phenol degradation reached under visible light was significantly lower than that under UV radiation due to the lower degree of light absorption by the catalyst surface. From the series of studied catalysts, 2 wt% Mo/TiO2 was the most efficient one. The synergetic effect between S-BET, mean pore size diameter, catalyst agglomerates size, band gap, ZPC and the type of M0(x)O(y), species on TiO2 surface, depending on Mo loading, created its photocatalytic performance. (C) 2015 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.