Um Estudo Cinético Sobre a Influência De Mediadores Fenólicos Na Descoloração De Diferentes Corantes Por Sistemas Fenton

Santana, Cássia Sidney; Velloso, Camila Cristina Vieira; Aguiar, André

doi:10.21577/0100-4042.20170316

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…By taking zero- and first-order reaction kinetics into account, it is possible to observe that they are also suitable for describing the decolorization of methylene blue by Fe 3+ /H 2 O 2 /3-HAA, phenol red by Fe 3+ /H 2 O 2 , chromotrope 2R, methyl orange, and safranin T by Fe 3+ /H 2 O 2 , and Fe 3+ /H 2 O 2 /3-HAA, since R 2 > 0.9 in all cases. Suitability of more than one kinetic model is also commonly found in literature [39,40,43,44,45,46].…”

Section: Resultsmentioning

confidence: 99%

Kinetic Evaluation of Dye Decolorization by Fenton Processes in the Presence of 3-Hydroxyanthranilic Acid

Santana

Ramos

Velloso

et al. 2019

IJERPH

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The fungal metabolite 3-hydroxyanthranilic acid (3-HAA) was used as a redox mediator with the aim of increasing dye degradation by Fenton oxidative processes (Fe2+/H2O2, Fe3+/H2O2). Its Fe3+-reducing activity can enhance the generation of reactive oxygen species as HO● radicals. Initially, the influence of 3-HAA on decolorization kinetics of five dyes (methylene blue, chromotrope 2R, methyl orange, phenol red, and safranin T) was investigated using decolorization data from a previous work conducted by the present research group. Fe3+-containing reaction data were well fitted with first-order and mainly second-order kinetic models, whereas the BMG (Behnajady, Modirshahla and Ghanbary) model obtained optimal fit to Fe2+. Improvements in kinetic parameters (i.e., apparent rate constants and maximum oxidation capacity) were observed with the addition of 3-HAA. In another set of experiments, a decrease in apparent activation energy was observed due to introducing 3-HAA into reactions containing either Fe2+ or Fe3+ in order to decolorize phenol red at different temperatures. This indicates that the redox mediator decreases the energy barrier so as to allow reactions to occur. Thus, based on recent experiments and the reaction kinetics models evaluated herein, pro-oxidant properties have been observed for 3-HAA in Fenton processes.

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Section: Resultsmentioning

confidence: 99%

Kinetic Evaluation of Dye Decolorization by Fenton Processes in the Presence of 3-Hydroxyanthranilic Acid

Santana

Ramos

Velloso

et al. 2019

IJERPH

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“…Para as reações contendo inicialmente Fe 2+ os valores de R 2 médio superiores a 0,9 foram encontrados para os modelos de 1 a e 2 a ordens e BMG. A adequação de mais de um modelo cinético para um determinado conjunto de reações também é comum na literatura (OU et al, 2013;SANTANA et al, 2019a;2019b). Ao comparar os mesmos modelos do presente estudo, considerando-se um bom ajuste aqueles que apresentaram coeficientes de correlação superiores a 0, 9, Santana et al (2019a)…”

Section: Resultsunclassified

EXPRESSÃO DIFERENCIAL DA SUPERÓXIDO DISMUTASE E CATALASE DURANTE A GERMINAÇÃO DE Lactuca sativa L. EXPOSTA A METAIS PESADOS

Neto¹,

Carvalho²,

Govêa³

et al. 2020

A Química Nas Áreas Natural, Tecnológica E Sustentável 3

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Direitos para esta edição cedidos à Atena Editora pelos autores. Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição 4.0 Internacional (CC BY 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. A Atena Editora não se responsabiliza por eventuais mudanças ocorridas nos endereços convencionais ou eletrônicos citados nesta obra. Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação.

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“…Esse mesmo modelo foi o mais apropriado em um estudo prévio do grupo para descolorir os mesmos corantes, porém com a adição de um mediador redutor de Fe 3+ , o ácido 3-hidroxiantranílico (Santana et al, 2019c). Ao avaliar o efeito de diferentes dihidroxibenzenos e ácido gálico como mediadores redutores, geralmente esse modelo também foi o mais apropriado (Santana et al, 2019b…”

Section: Resultsunclassified

Kinetic Study of the Effect of Methylene Blue on the Decolorization of Other Dyes by Fenton Processes

Costa¹,

Aguiar²

2019

PTQ

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The textile industry can cause serious environmental impacts due to the wastewater generated in its operations involving dyes, many of which have carcinogenic and mutagenic properties. The advanced oxidative processes, especially those based on the Fenton reaction (Fe2+ + H2O2 → Fe3+ + HO- + HO●), have been highlighted as an alternative for the treatment of textile effluents. These processes are based on the generation and action of free radicals, such as the radical HO●, for the degradation of organic pollutants. As these effluents can present more than one dye, the present work evaluated the influence of Methylene Blue dye in the decolorization of other dyes by Fenton processes (Fe2+/H2O2, Fe3+/H2O2). The decolorization tests were carried out over 60 min and monitored by spectrophotometry. With basis on the decolorization data, kinetic models (zero-, first-, second-orders, BMG) were analyzed to verify if the Methylene Blue has pro- or antioxidant properties. It was found that Methylene Blue promoted an increase in the decolorization of Phenol Red and Safranin T, little influence on Methyl Orange, while the decolorization of Cromotrope 2R was diminished. In general, the kinetic model that best fit the experimental data was the 2ª order. The BMG model fitted well to Fe2+-catalyzed reactions, whereas those containing initially Fe3+ the zero- and 1st-order models also showed good adjustments. Except for Cromotrope 2R, increases in kinetic parameter values were observed due to the addition of AM mediator dye. These results demonstrate that a dye can enhance, or even decrease, the degradation of other dyes by Fenton-based processes.

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Um Estudo Cinético Sobre a Influência De Mediadores Fenólicos Na Descoloração De Diferentes Corantes Por Sistemas Fenton

Cited by 7 publications

References 15 publications

Kinetic Evaluation of Dye Decolorization by Fenton Processes in the Presence of 3-Hydroxyanthranilic Acid

Kinetic Evaluation of Dye Decolorization by Fenton Processes in the Presence of 3-Hydroxyanthranilic Acid

EXPRESSÃO DIFERENCIAL DA SUPERÓXIDO DISMUTASE E CATALASE DURANTE A GERMINAÇÃO DE Lactuca sativa L. EXPOSTA A METAIS PESADOS

Kinetic Study of the Effect of Methylene Blue on the Decolorization of Other Dyes by Fenton Processes

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