Fenton Reagent
Mostrando 25-36 de 39 artigos, teses e dissertações.
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25. REMOVAL OF MANGANESE FROM WATERS AND INDUSTRIAL EFFLUENTS WITH USE OF HYDROGEN PEROXIDE / REMOÇÃO DE MANGANÊS DE ÁGUAS E EFLUENTES INDUSTRIAIS COM UTILIZAÇÃO DO PERÓXIDO DE HIDROGÊNIO
I order to remove metals from waters and aqueous effluents generally are employed traditional methods which involve neutralization, hydrolysis and precipitation of hydroxides using a base. Manganese must be removed from waters and aqueous effluents down to a concentration limited by Brazilian law which is of 0.1 mg/L for waters and 1.0 mg/L for aqueous efflu
Publicado em: 2004
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26. Uso do reagente de Fenton como oxidante secundário em sistemas de destruição de resíduos através de oxidação térmica / Use of Fentons reagent as a secondary oxidant in residue destruction systems based on thermic oxidation
Incineração pode ser considerado um método terminal para a disposição de resíduos. Apesar de toda vantagem que possa apresentar, a oposição a este tipo de tratamento tem sido frequentemente renovada em função de traços de dioxinas cloradas, furanos clorados e outros compostos detectados nos efluentes gasosos de incineradores de resíduos. A efici�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/11/2002
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27. Remediação de solos contaminados com pesticidas organoclorados utilizando reagente de Fenton
The efficiency of the Fenton s reagent was evaluated in the remediation of organochlorine pesticide contaminated soils with "Drins". The Fenton s reagent is one of the so-called Advanced Oxidation Processes. The remediation study followed the steps: (1) Mapping of the contaminated area; (2) Bath degradation tests; (3) Degradation tests in soil packed column
Publicado em: 2001
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28. Fotodestruição de compostos potencialmente toxicos utilizando TiO2 e luz solar
The destruction of potentially toxic compounds by photocatalysis was studied in this work in two different systems: a) the system using colloidal TiO2, where the influence of silver deposits was evaluated for the photodegradation of phenol. b) the system using TiO2 P 25 supported on a glass plate as part of a plug flow reactor using solar light as source of
Publicado em: 1995
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29. Killing of Bacillus Spores by Aqueous Dissolved Oxygen, Ascorbic Acid, and Copper Ions
An approach to decontamination of biological endospores is discussed. Specifically, the performance of an aqueous modified Fenton reagent is examined. A modified Fenton reagent formulation of cupric chloride, ascorbic acid, and sodium chloride is shown to be an effective sporicide under aerobic conditions. The traditional Fenton reaction involves the convers
American Society for Microbiology.
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30. Enhanced Degradation of Polyvinyl Alcohol by Pycnoporus cinnabarinus after Pretreatment with Fenton’s Reagent
Degradation of polyvinyl alcohol (PVA) was investigated by using a combination of chemical treatment with Fenton’s reagent and biological degradation with the white rot fungus Pycnoporus cinnabarinus. Inclusion of the chemical pretreatment resulted in greater degradation of PVA than the degradation observed when biological degradation alone was used.
American Society for Microbiology.
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31. The Fenton oxidation mechanism: reactivities of biologically relevant substrates with two oxidizing intermediates differ from those predicted for the hydroxyl radical.
The application of kinetic probes that allow one to determine relative reactivities of biologically relevant substrates with oxidizing intermediates in the Fenton reagent (H2O2 plus Fe2+ in acidic aqueous solution) is described. These results lead to the conclusion that there are two key intermediates with very different reactivity patterns. One (X) is propo
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32. Killing of Bacillus subtilis Spores by a Modified Fenton Reagent Containing CuCl2 and Ascorbic Acid
Bacillus subtilis spores were killed by CuCl2-ascorbic acid, chloride ions were essential for killing of spores, and spores with defective coats were killed more rapidly. CuCl2-ascorbic acid did not damage spore DNA, and spores killed by this reagent initiated germination. However, spores killed by CuCl2-ascorbic acid may have damage to their inner membrane.
American Society for Microbiology.
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33. Hydroxylated Metabolites of 2,4-Dichlorophenol Imply a Fenton-Type Reaction in Gloeophyllum striatum†
While degrading 2,4-dichlorophenol, two strains of Gloeophyllum striatum, a basidiomycetous fungus causing brown rot decay of wood, simultaneously produced 4-chlorocatechol and 3,5-dichlorocatechol. These metabolites were identified by comparing high-performance liquid chromatography retention times and mass spectral data with those of chemically synthesized
American Society for Microbiology.
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34. Pathways for Extracellular Fenton Chemistry in the Brown Rot Basidiomycete Gloeophyllum trabeum
The brown rot fungus Gloeophyllum trabeum uses an extracellular hydroquinone-quinone redox cycle to reduce Fe3+ and produce H2O2. These reactions generate extracellular Fenton reagent, which enables G. trabeum to degrade a wide variety of organic compounds. We found that G. trabeum secreted two quinones, 2,5-dimethoxy-1,4-benzoquinone (2,5-DMBQ) and 4,5-dime
American Society for Microbiology.
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35. Optimization of Simultaneous Chemical and Biological Mineralization of Perchloroethylene†
Optimization of the simultaneous chemical and biological mineralization of perchloroethylene (PCE) by modified Fenton’s reagent and Xanthobacter flavus was investigated by using a central composite rotatable experimental design. Concentrations of PCE, hydrogen peroxide, and ferrous iron and the microbial cell number were set as variables. Percent mineraliz
American Society for Microbiology.
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36. Hemoglobin Toxicity in Experimental Bacterial Peritonitis Is Due to Production of Reactive Oxygen Species
Hemoglobin (Hb) is a toxic molecule responsible for the extreme lethality associated with experimental Escherichia coli peritonitis, but the mechanism has yet to be elucidated. Hb, but not globin, showed toxic effects in a live E. coli model but not in a model using killed E. coli. Methemoglobin, hematin, and the well-known Fenton reagents iron and iron
American Society for Microbiology.