Dehalogenation
Mostrando 1-12 de 155 artigos, teses e dissertações.
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1. Polydimethylsiloxane as a Matrix for the Stabilization and Immobilization of Zero-Valent Iron Nanoparticles. Applications to Dehalogenation of Environmentally Deleterious Molecules
A wet-synthetic method is described to obtain magnetic, air-stable, zero-valent iron nanoparticles coated with an alkanedioic acid. The particles can be immobilized in an amino-substituted polysiloxane matrix to provide materials capable of dechlorinating, debrominating, and deiodinating a wide variety of halogenated organic molecules dissolved initially in
J. Braz. Chem. Soc.. Publicado em: 2018-07
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2. Kinetics and Product Analysis of the Electrochemical Dehalogenation of Hexachlorobenzene
A method for establishing the kinetics and products of the electrochemical degradation of hexachlorobenzene (HCB) is described. One plausible way of reducing HCB´s toxicity is through cathodic dehalogenation. The characterization of products formed during the electrochemical reduction and the reaction kinetics are both reported. Pentachlorobenzene (PCB), te
J. Braz. Chem. Soc.. Publicado em: 2015-04
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3. Sintetização, caracterização e aplicação do ferro metálico nanoparticulado na redução de compostos organoclorados para a recuperação ambiental / Synthesizing, characterization and application of nanoscale iron particles to dehalogenation of organic compounds for environmental remediation
The objective of this work was the synthesizing, characterization and application of nanoscale iron particles to dehalogenation of organic compounds for environmental remediation. In this study, laboratory assessment has demonstrated that (1) metallic iron nanoparticles (Fe$ ^0$ ) can be prepared by the solution method from common precursor Fe (III) and that
Publicado em: 2009
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4. Sintetização, caracterização e aplicação do ferro metálico nanoparticulado na redução de compostos organoclorados para a recuperação ambiental / Synthesizing, characterization and application of nanoscale iron particles to dehalogenation of organic compounds for environmental remediation
O objetivo deste trabalho foi de sintetizar, caracterizar e aplicar o ferro metálico nanoparticulado na redução de compostos organoclorados, visando a recuperação ambiental. Este estudo demonstrou que, (1) partículas de ferro metálico (Fe$ ^0$ ), com dimensões nanométricas (70 nm, em média), podem ser sintetizadas utilizando-se cátion férrico Fe
Publicado em: 2009
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5. 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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6. Metil coenzima M redutase (MCR) e o fator 430 (F430)
This review presents studies on methyl coenzyme M reductase, the biological system Factor 430 (F430) and the use of nickel(II) complexes as structural and functional models. The ability of F430 and nickel(II) macrocycle complexes to mediate the reductive dehalogenation of cyclohexyl halogens and the CH3-S bond cleavage of methyl CoM (by sodium borohydride an
Química Nova. Publicado em: 2006-10
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7. 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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8. Contribution to technological research of the microbial studies done at program BIOTA FAPESP: evaluation of anaerobic Pentachlorophenol (PCP) biodegradation in a horizontal-flow anaerobic immobilized biomass (HAIB) reactor / Contribuição à exploração tecnológica dos estudos microbianos realizados no programa BIOTA FAPESP: avaliação do potencial da degradação anaeróbia de pentaclorofenol (PCP) em reator anaeróbio horizontal de leito fixo (RAHLF)
O estudo que ora se apresenta integrou o conjunto de pesquisas do sub-projeto - Diversidade de Bactérias Associadas à Degradação de Compostos Recalcitrantes, do projeto temático BIOTA FAPESP - Ecologia Molecular e Taxonomia Polifásica de Bactérias de Interesse Ambiental e Agro-Industrial. Apresenta caráter inovador, na medida em que procurou avaliar
Publicado em: 2005
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9. Redução eletroquímica de cinamatos de metila orto-substituídos / Electrochemical reduction of ortho-substituted methyl cinnamates
The synthesis and electrochemical reduction in DMF of some ring substituted cinnamic esters are described. The main objective if this work is to verify the influence of the substituents on the electrohydrodimerization (EHD). The substrates studied were the methyl esters of o-methyl- (1), o-chloro- (2), o-nitro- (3), m,p-dichloro- (4), m-chloro- (5), p-chloro
Publicado em: 2004
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10. Anaerobic Aryl Reductive Dehalogenation of Halobenzoates by Cell Extracts of “Desulfomonile tiedjei”
We studied the transformation of halogenated benzoates by cell extracts of a dehalogenating anaerobe, “Desulfomonile tiedjei.” We found that cell extracts possessed aryl reductive dehalogenation activity. The activity was heat labile and dependent on the addition of reduced methyl viologen, but not on that of reduced NAD, NADP, flavin mononucleotide, fla
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11. Influence of sulfur oxyanions on reductive dehalogenation activities in Desulfomonile tiedjei.
The inhibition of aryl reductive dehalogenation reactions by sulfur oxyanions has been demonstrated in environmental samples, dehalogenating enrichments, and the sulfate-reducing bacterium Desulfomonile tiedjei; however, this phenomenon is not well understood. We examined the effects of sulfate, sulfite, and thiosulfate on reductive dehalogenation in the mod
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12. Microbial reductive dehalogenation.
A wide variety of compounds can be biodegraded via reductive removal of halogen substituents. This process can degrade toxic pollutants, some of which are not known to be biodegraded by any other means. Reductive dehalogenation of aromatic compounds has been found primarily in undefined, syntrophic anaerobic communities. We discuss ecological and physiologic