Reductive Degradation
Mostrando 1-12 de 65 artigos, teses e dissertações.
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1. 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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2. DIRECT INFUSION ESI-MS APPLIED IN THE DETECTION OF BYPRODUCTS DUE TO REDUCTIVE DEGRADATION OF ACETAMIPRID BY ZERO-VALENT IRON
This study investigated the reductive degradation of acetamiprid (5 mg L-1) in aqueous medium (at pH 2.0) induced by zero-valent iron (50 mg). The process was monitored using high-performance liquid chromatography (HPLC) to determine the degradation rate as a function of reaction time, and direct infusion electrospray ionization mass spectrometry (DI-ESI-MS)
Quím. Nova. Publicado em: 2015-09
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3. Use of multivariate experimental designs for optimizing the reductive degradation of an azo dye in the presence of redox mediators
The optimization of the anaerobic degradation of the azo dye Remazol golden yellow RNL was performed according to multivariate experimental designs: a 2² full-factorial design and a central composite design (CCD). The CCD revealed that the best incubation conditions (90% color removal) for the degradation of the azo dye (50 mg L- 1) were achieved with 350 m
Quím. Nova. Publicado em: 2014-06
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4. Degradação de espécies nitroaromáticas e remediação de efluentes da indústria de explosivos, utilizando-se processos redutivos-oxidativos fundamentados no uso de ferro metálico
In this work the potentiality of reductive-oxidative processes based on zero-valent iron was studied aiming the degradation of nitroaromatic compounds and the remediation of residues from the explosive industry. The reductive process was applied as a continuous treatment system, using steel-wool as zero-valent iron source. The process permitted an almost tot
Química Nova. Publicado em: 2009
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5. Estudo de processos alternativos para a degradação de compostos de relevância ambiental com monitoramento dos produtos formados por espectometria de massas com fonte de ionização electrospray (ESI-MS)
Over the last decades, the growth of population and industrial activities has contributed to the aggravation of environmental problems, especially the contamination of superficial and underground waters. This is mainly caused by the enormous amounts of domestic or industrial wastes that are many times discarded directly into these bodies with no previous tre
Publicado em: 2008
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6. Caracterização da comunidade bacteriana em água subterrânea contaminada com tetracloroeteno / Characterization of the bacterial community in groundwater contaminated with tetrachloroethene
Tetrachloroethene (PCE) is one of the most important contaminants of groundwater, since it is highly toxic and potentially carcinogenic. The bacterial communities of PCE contaminated groundwater and the diversity of bacteria capable of degrading this contaminant are barely known. The objective of this work is to compare the structure of bacterial communities
Publicado em: 2008
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7. Tratamento de água subterrânea contaminada com compostos organoclorados usando ferro elementar e o reagente de Fenton
The remediation of groundwater containing organochlorine compounds was evaluated using a reductive system with zero-valent iron, and the reductive process coupled with Fenton's reagent. The concentration of the individual target compounds reached up to 400 mg L-1 in the sample. Marked reductions in the chlorinated compounds were observed in the reductive pro
Química Nova. Publicado em: 2007
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8. Study of p-nitrophenol degradation by zero-valent iron: evaluation of reductive and oxidative processes / Estudo da degradação do p-nitrofenol por ferro de valência zero: avaliação de processos redutivos e oxidativos
Neste trabalho estudou-se o uso do ferro de valência zero em meio redutivo e oxidativo, a fim de desenvolver um processo que promova tanto a degradação quanto a mineralização de substâncias orgânicas com centros deficientes de elétrons, como, por exemplo, espécies que contêm o grupo nitro ligado ao anel aromático. O processo de degradação empreg
Publicado em: 2007
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9. Influência dos nutrientes nitrogênio e fósforo na degradação anaeróbia do pentaclorofenol e na diversidade microbiana dos sedimentos enriquecidos do Estuário de Santos-São Vicente, Estado de São Paulo / Influence of nitrogen and phosphorus nutrients on the anaerobic degradation of pentachlorophenol and on the natural microbial diversity of sediments from the Santos-São Vicente estuary, state of São Paulo, Brazil
The research presented here aimed to determine the optimal nutritional conditions for the use of sediment from the Santos-São Vicente estuary in the state of São Paulo, Brazil, as an inoculum for a horizontal-flow anaerobic immobilized biomass reactor (HAIB) applied to the anaerobic degradation of pentachlorophenol (PCP), seeking to apply the technology on
Publicado em: 2007
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10. Degradação de corantes reativos pelo sistema ferro metálico/peróxido de hidrogênio
In this work the degradation of aqueous solutions of reactive azo-dyes is reported using a combined reductive/advanced oxidative process based in the H2O2/zero-valent iron system. At optimized experimental conditions (pH 7, H2O2 100 mg L-1, iron 7 g L-1) and using a continuous system containing commercial iron wool, the process afforded almost total discolor
Química Nova. Publicado em: 2005-03
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11. Uso de processos oxidativos avançados e ferro elementar na remediação de agua subterranea contendo compostos organoclorados / Use of advanced oxidation process and zero valent ironinremediation of groundwater containing chlorinated compounds
The remediation of groundwater containing organochlorine compounds was evaluated in this work using UV (photolysis), Fenton (H2O2/Fe) and photo-Fenton (UV/H2O2/Fe). A reductive system using zero valent iron aiming the reductive dehalogenation of the compounds has also been tested. All the experiments were performed using an upflow reactor operating in a reci
Publicado em: 2005
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12. SÃntese e avaliaÃÃo do potencial biolÃgico de novos derivados N-fenacilados do aza-biciclo pirrolidino [3,2-d] isoxazolina
Recently, our group of research had been gotten N-(benzoyl)-pyrrolidine[3,2-d]-2- isoxazolines derivatives 40, by 1,3-dipolar cycloaddition of five membered endociclic enecarbamates and enamides, with excellent biological activities. Due to this fact, we intended the obtention of the derivatives N-(fenacyl)-pyrrolidine[3,2-d]-2-isoxazolines 41, using the aza
Publicado em: 2005