Remoção dos hormônios 17β-estradiol e 17α-etinilestradiol de soluções aquosas empregando turfa decomposta como material adsorvente

Fernandes, Andreia Neves; Giovanela, Marcelo; Almeida, Carlos; Esteves, Valdemar I.; Sierra, Maria Marta de Souza; Grassi, Marco Tadeu

doi:10.1590/s0100-40422011000900009

Cited by 27 publications

(18 citation statements)

References 39 publications

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“…Additionally, there was no saturation of the adsorbent, that is, the value of the adsorption capacity increased as the pharmaceutical concentration increased; however, the removal percentage remained at approximately 20%. A value of n greater than 1.0 indicated that the process of DCF adsorption onto the grape bagasse was favorable [36].…”

Section:  mentioning

confidence: 99%

Removal of diclofenac sodium from aqueous solution by Isabel grape bagasse

Antunes

Esteves

Guégan

et al. 2012

Chemical Engineering Journal

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International audienceThe aim of the present work was to evaluate the morphologic and chemical characteristics of Isabel grape (Vitis labrusca x Vitis vinifera) bagasse and to describe the adsorption of diclofenac sodium (DCF) from aqueous solutions by this biomass. Grape bagasse was constituted mainly of particles with heterogeneous shapes and sizes, and it exhibited a macroporous structure and a low specific surface area (∼ 2 m2 g-1). The adsorbent material was also rich in oxygenated functional groups, especially -OH, and required an acidic pH to neutralize its surface. With respect to the adsorption of DCF, the percentage removal did not appear to depend on the initial concentration of the pharmaceutical. A pseudo-second-order kinetic model described the rate-controlling step, and the adsorption isotherms were well fitted by the Freundlich model. Concerning the thermodynamic data, the results showed that the adsorption of DCF onto grape bagasse occurred via an exothermic process accompanied by a decrease in the randomness at the solid/solution interface. Furthermore, the removal percentages of DCF ranged from 16.4 to 22.8%

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Section:  mentioning

confidence: 99%

Removal of diclofenac sodium from aqueous solution by Isabel grape bagasse

Antunes

Esteves

Guégan

et al. 2012

Chemical Engineering Journal

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200

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“…Adsorbent materials such as activated carbon (Huang et al 2008;Shao et al 2013;Ding et al 2014), resins (Pan et al 2006), montmorillonite (Almeida et al 2009;Ye and Lemley 2009;Xue et al 2013;Marco-Brown et al 2014), organoclay (Ko et al 2007), chitosan (Ngah and Fatinathan 2006), mineral waste from coal mining (Almeida et al 2010), nanoparticles (Jing et al 2013), cotton fibres (Liu et al 2014a, b), magnetic adsorbents (Ma et al 2014), montmorillonite clay modified with iron (Cottet et al 2014), among others, have been used in order to remove PNP and other contaminants from aqueous solutions. In contrast, peat is an alternate, low-cost biosorbent of high porosity that does not require activation and is feasible in many tropical countries, including Brazil (Fernandes et al 2007(Fernandes et al , 2011Rovani et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Using knowledge of the characteristics and composition of peat, it has become widely used and studied as an alternate material for the treatment of waters and effluents (Couillard 1994;Brown et al 2000;Zhi-rong et al 2008) in an adsorption processes (Twardowska et al 1999;Petroni et al 2000;Ringqvist et al 2002;Fernandes et al 2007Fernandes et al , 2010aFernandes et al , 2011Zhi-rong et al 2008;Rovani et al 2014). Several studies have been developed with peat, owing to its high capacity to remove contaminants such as metals, dyes, organic molecules and odours from domestic and industrial effluents (Couillard 1994).…”

Section: Introductionmentioning

confidence: 99%

Removal of p-Nitrophenol from Aqueous Solution Using Brazilian Peat: Kinetic and Thermodynamic Studies

Jaerger

Santos

Fernandes

et al. 2015

Water Air Soil Pollut

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Removal of p-nitrophenol (PNP) from aqueous solutions using fibrous peat has been investigated in this study by batch adsorption experiments. Factors that can affect the adsorption process, such as pH, temperature, initial PNP concentration and contact time, have been investigated. Fourier transform infrared (FTIR) and thermogravimetric analysis (TGA) measurements have also been obtained in order to study the adsorption mechanism of PNP by peat. The Langmuir and Freundlich equations have been applied to investigate the equilibrium. The data fitted the Langmuir isotherm well, with the maximum adsorption capacity decreasing with temperature from 23.4 to 16.1 mg g −1 . In general, the adsorption equilibrium was attained within 100 min. For the kinetics study, the best fit was obtained by the pseudo-second-order model instead of the pseudo-firstorder model, both of which applied to the experimental data, whereas the results of intraparticle diffusion show a two-step adsorption process. The activation energy value of 70.31 kJ mol −1 , calculated from the Arrhenius equation, indicated a predominantly chemical adsorption, whereas the thermodynamic parameters, obtained by the van't Hoff equation, were exothermic and spontaneous in nature.

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“…No Brasil produtos agrícolas são produzidos em grande escala devido a intensificação das ações humanas, do consumo, produções e exploração de matéria-prima, advindo do crescente populacional e industrial, e seus resíduos se não forem descartados ou aproveitados adequadamente podem acarretar grande impactos ambientais, principalmente nos solos e recursos hídricos. Este fato tem se tornado cada vez mais motivo de preocupação, uma vez que o acúmulo desses resíduos implica na presença de substâncias altamente toxicas dependendo da sua concentração, sendo prejudiciais ao meio ambiente prejudicando a qualidade das águas, dos solos e a saúde humana (FERNANDES et al, 2011;REBOUÇAS, BRAGA e TUNDISI, 2002).…”

Section: Apresentaçãounclassified

Estudo cinético da adsorção do antibiótico sulfametoxazol pela casca de arroz in natura

Tavares¹,

Sousa²,

Coelho³

et al. 2017

Tecnologias Em Pesquisa: Ciências Exatas E Biológicas

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Resumo: Neste trabalho estudou-se a cinética de adsorção do contaminante sulfametoxazol pela casca de arroz, na busca de um adsorvente alternativo que além de contribuir para a descontaminação ambiental, é considerado como um possível recurso de baixo custo. A casca de arroz foi preparada adequadamente em laboratório, sendo as curvas cinéticas obtidas em diferentes taxas de agitação do sulfametoxazol com o material adsorvente. A cinética foi avaliada de acordo com os modelos de pseudo-primeira ordem, pseudo-segunda-ordem e de difusão intrapartícula, definindo qual se ajusta melhor aos dados experimentais. Através dos resultados de cinética observou-se adequação ao modelo de pseudo-segunda ordem e que a difusão intrapartícula não é o único recurso de adsorção, pois ocorrem outras interações entre adsorvente e adsorvato. Os resultados demonstraram que a casca de arroz é um adsorvente alternativo de baixo custo com capacidade satisfatória para remover o sulfametoxazol. Palavras-chave: Sulfametoxazol. Casca de arroz. Capacidade de adsorção. Estudo Cinético.

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Remoção dos hormônios 17β-estradiol e 17α-etinilestradiol de soluções aquosas empregando turfa decomposta como material adsorvente

Cited by 27 publications

References 39 publications

Removal of diclofenac sodium from aqueous solution by Isabel grape bagasse

Removal of diclofenac sodium from aqueous solution by Isabel grape bagasse

Removal of p-Nitrophenol from Aqueous Solution Using Brazilian Peat: Kinetic and Thermodynamic Studies

Estudo cinético da adsorção do antibiótico sulfametoxazol pela casca de arroz in natura

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