Fenton Reaction
Mostrando 13-24 de 137 artigos, teses e dissertações.
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13. ESTUDO MECANÍSTICO DAS REAÇÕES FENTON E CUPRO-FENTON POR ANÁLISE VOLTAMÉTRICA IN SITU
Although the classical Fenton process exhibits a high initial rate of the organic compounds degradation, this process is not complete due to the formation of refractory compounds which resist the attack of the hydroxyl radicals. In the presence of Cu(II), the degradation is slower, but results in a greater reduction of TOC (total organic carbon) measurements
Quím. Nova. Publicado em: 2017-08
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14. Treatment of Sanitary Landfill Leachate by Photo-Fenton Process: Effect of the Matrix Composition
In this study it was evaluated the role of the composition of sanitary landfill leachate on the removal of dissolved organic carbon (DOC) by photo-Fenton process. The composition of the matrix (high turbidity and color, as well as presence of inorganic ions sulfate and chloride) does not reduce the efficiency of DOC removal by photo-Fenton reactions, but inf
J. Braz. Chem. Soc.. Publicado em: 2016-12
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15. Yerba Mate Tea Extract: a Green Approach for the Synthesis of Silica Supported Iron Nanoparticles for Dye Degradation
This work describes a green approach to the synthesis of iron nanoparticles supported in silica using tea extract of the South American plant yerba mate (Ilex paraguariensis). Catalysts with different iron contents were obtained according to the reaction conditions employed. Characterization by X-ray powder diffraction (XRD) and scanning electron microscopy
J. Braz. Chem. Soc.. Publicado em: 2016-11
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16. Preparation of Mesoporous Fe2O3-Supported ZSM-5 Zeolites by Carbon-Templating and their Evaluation as Photo-Fenton Catalysts to Degrade Organic Pollutant
Mesoporous Fe2O3-supported ZSM-5 zeolites were prepared by carbon-templating and subsequently evaluated as photo-Fenton catalysts to degrade a dye used as a model heavy organic pollutant. The synthesis procedure of the mesoporous ZSM-5 zeolites was performed employing a nucleating gel and carbon particles as mesopores template. Thereafter, the precursor salt
Mat. Res.. Publicado em: 20/10/2016
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17. Comparing Photo-Fenton Degradation of Malachite Green Using FeII and FeIII Salts Under UVA Light Irradiation
Photo-Fenton degradation of pollutants involves the reaction of FeIIsalts with hydrogen peroxide under ultraviolet A irradiation, which significantly enhances the process. The reaction with FeIIIsalts is slower and therefore less studied. In this work, we compared the efficiencies of FeIIIand FeII salts in the photo-Fenton degradation of malachite green (MG)
J. Braz. Chem. Soc.. Publicado em: 2016-02
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18. Magnetic Nanoparticles Obtained by Homogeneous Coprecipitation Sonochemically Assisted
The present work demonstrates preparation of magnetic nanoparticles by a novel method. Magnetic nanoparticles with potential for biomedical and environmental applications were obtained by homogeneous coprecipitation method sonochemically assisted. The effect of ultrasonic cavitation on changing the reaction environment was studied. The chemical reaction medi
Mat. Res.. Publicado em: 2015-12
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19. Evaluation of biological activities of Physalis peruviana ethanol extracts and expression of Bcl-2 genes in HeLa cells
Physalis species are used in folk medicine for phytotherapeutic properties. The extracts of medicinal plants are known to possess cytotoxic and chemopreventative compounds. In this study we investigated antibacterial, antioxidant, DNA damage preventative properties of Physalis peruviana (golden berry) on leaf and shoot ethanol extracts and their effects on c
Food Sci. Technol. Publicado em: 2014-06
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20. Óxidos de ferro e suas aplicações em processos catalíticos: uma revisão
A review of most of the reported studies on the use of iron oxides as catalyst in specific processes, namely Haber-Bosch reaction, Fischer-Tropsch synthesis, Fenton oxidation and photolytic molecular splitting of water to produce gaseous hydrogen, was carried out. An essential overview is thus presented, intending to address the fundamental meaning, as well
Quím. Nova. Publicado em: 2013
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21. Interference of inorganic ions on phenol degradation by the Fenton reaction
The addition of Cu2+ ions to the classical Fenton reaction (Fe2+ plus H2O2 at pH 3) is found to accelerate the degradation of organic compounds. This synergic effect causes an approximately 15 % additional reduction of the total organic carbon (TOC), representing an overall improvement of the efficiency of the mineralization of phenol. Although Fe2+ exhibits
Sci. agric. (Piracicaba, Braz.). Publicado em: 2012-12
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22. Mechanistic implications of zinc(II) ions on the degradation of phenol by the fenton reaction
Um estudo da interferência de íons Zn2+ na reação de Fenton (Fe2+/Fe3+ + H2O2) na degradação de fenol é relatado. Um dos intermediários formados inicialmente na reação, catecol, pode reduzir Fe3+ a Fe2+, e na presença de H2O2 inicia um ciclo redox catalítico. Nas etapas iniciais da reação, este ciclo mediado por catecol torna-se a principal via
Journal of the Brazilian Chemical Society. Publicado em: 2012-07
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23. Electron paramagnetic resonance study of lipid and protein membrane components of erythrocytes oxidized with hydrogen peroxide
Electron paramagnetic resonance (EPR) spectroscopy of spin labels was used to monitor membrane dynamic changes in erythrocytes subjected to oxidative stress with hydrogen peroxide (H2O2). The lipid spin label, 5-doxyl stearic acid, responded to dramatic reductions in membrane fluidity, which was correlated with increases in the protein content of the membran
Brazilian Journal of Medical and Biological Research. Publicado em: 2012-06
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24. Zn-edta degradation by catechol-driven fenton reaction
Zn-EDTA degradabilty by catechol-driven Fenton reaction was studied. Response surface methodology central composite design was employed to maximize this complex degradation. Theoretical speciation calculations were in good agreement with the experimental results. Fenton and Fenton type treatments are typically thought to be applicable only in the highly acid
Quím. Nova. Publicado em: 2012