Remoção do Corante Têxtil Turquesa de Remazol Empregando Aguapé (Eichhornia crassipes) como Adsorvente

Holanda, Carlos Alexandre; Souza, Janílson Lima; Santos, Clayane Carvalho dos; Silva, Hildo Antonio dos Santos; Santana, Sirlane Aparecida Abreu; Costa, Maria Célia Pires; Schultz, Mário Sérgio; Bezerra, Cícero Wellington Brito

doi:10.17807/orbital.v7i2.622

Cited by 10 publications

(6 citation statements)

References 40 publications

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“…Hence, below these pH values, the surfaces of the adsorbents would be positively charged, favoring anion adsorption, while at higher values, the surfaces would be negatively charged, favoring the adsorption of cations. The pHpzc value for RHI was very close to values reported in the literature for in natura rice hull (5.3) [19] and babassu coconut epicarp (6.7) [39,40] . In other work, it was found that in natura wood sawdust had a pHpzc of 5.3, which decreased to 4.0 after treatment with hydrochloric acid [41] .…”

Section: Phpzc and Effect Of Phsupporting

confidence: 84%

Removal of Remazol brilliant violet textile dye by adsorption using rice hulls

et al. 2017

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ObstractThe release of industrial effluents into the environment causes widespread contamination of aquatic systems. Adsorption is seen as one of the most promising treatment processes, and lignocellulosic materials have gained prominence as adsorbents. This study investigates the potential of rice hulls, either in natura or treated with nitric acid, as adsorbents for removal of the dye. The adsorbents were characterized by infrared spectroscopy, solid state 13 C-NMR, thermogravimetric analysis, and pH at point of zero charge. The dye adsorption experiments were carried out in batch mode, using different experimental conditions. The kinetic adsorption data could be fitted using the model of Elovich. The Freundlich model provided the best fit to the isothermal data. The thermodynamic parameters confirmed the spontaneity of the adsorption process. These adsorbents offer an alternative for dye removal, with advantages including biomass availability and low cost.

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Section: Phpzc and Effect Of Phsupporting

confidence: 84%

Removal of Remazol brilliant violet textile dye by adsorption using rice hulls

et al. 2017

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“…Besides, the maximum adsorption capacity would be 48.13 mg g -1 according to the model. A similar fit was reported by HOLANDA et al [20] which removed the Remazol turquoise textile dye using Eichhornia crassipes as adsorbent, where the best fit model was Sips with R² = 0.99. ior that shows single-layer adsorption capacity, while low concentrations presume the similarity of isotherm of Freundlich, which forms more than one layer of adsorbate on the adsorbent [21]. Thus, the Sips model was chosen to represent the equilibrium data of this work.…”

Section: Models Parameterssupporting

confidence: 78%

Soybean hull as an alternative biosorbent to uptake a reactive textile dye from aqueous solutions

et al. 2021

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The textile industries are responsible for generating large volumes of effluents containing toxic dyes, harmful to ecosystems if disposed of without prior treatment. The adsorption process stands out due to its simplicity and efficiency in removing a wide variety of contaminants present in effluents, also, it allows the use of residual biomass from agriculture. The soybean hull is a by-product of wide available but made used only for animal feed. Thus, the present study aimed to characterize and evaluate the soybean husk as a biosorbent of the 5G blue reactive dye, widely used in the dyeing processes of the textile industries. The soybean hull was characterized by SEM and FTIR. Kinetic and equilibrium tests were carried out under conditions of pH 2, 40 ºC, and 90 rpm. Besides, kinetic and equilibrium mathematical models previously described in the literature were adjusted to the experimental data. Through the morphological characterization of the biosorbent, it was possible to evidence superficial pores in practically all their extension, a characteristic that directly influences the adsorption process. The analysis of FTIR showed, as expected, the presence of functional groups characteristic of lignocellulosic substances. Besides, the results obtained in the kinetic and equilibrium essays in the studied conditions show that the adsorption equilibrium was obtained in about 120 min, with the removal of 88% of the dye. The mathematical modeling indicated that the pseudo-second order and Sips models were the most adequate to represent the kinetic and equilibrium experimental data, respectively. The maximum adsorption capacities calculated experimentally and predicted by the Sips model were 53.33 and 48.13 mg g -1 , respectively. In general, the biosorbent studied was effective to remove the reactive dye.

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“…O efeito do pH no processo de adsorção foi avaliado pelo método em batelada, à temperatura de 25 ºC e pressão atmosférica, conforme metodologia de Holanda et al (2015). Soluções de sulfato de cobre 200 mg.L -1 foram preparadas nos intervalos de pH entre 3 e 6.…”

Section: Infl Uência De Phunclassified

Utilização De Subprodutos Da Cadeia Produtiva Do Arroz Como Adsorventes Para a Remoção De Cobre Em Uma Solução Sintética

Voltolini¹,

Ferreira²,

Alves

2021

R. Ci. Amb.

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A casca de arroz é um subproduto obtido nas primeiras etapas de beneficiamento do arroz. Geralmente é destinada para a geração de energia através da sua incineração, dando origem a um novo resíduo, a cinza de casca de arroz. Indústrias de diversos segmentos (processamento de metais) produzem grande quantidade de efluentes contendo teores de cobre superior à concentração permitida pela legislação, fazendo-se necessário o estudo de técnicas para a sua remoção, como a adsorção. Neste trabalho, casca de arroz tratada (CAT) e cinza da casca de arroz (CCA) foram utilizados como materiais adsorventes para a remoção de íons cobre em efluente sintético. Os espectros de infravermelho para a CAT e para a CCA sugerem a presença de celulose, lignina e hemicelulose e silicatos, respectivamente. Verificou-se que, para a CAT e CCA, a adsorção é favorecida em pHs variando entre 4 a 6, uma vez que pH superiores a 6, tende a formar precipitados insolúveis de cobre, e em pHs muito ácidos, os íons hidrogênio (H+) tendem a competir com o cobre pelo sítio ativo do adsorvente. A cinética predominante ao modelo foi de pseudo-segunda ordem, e o modelo de isoterma de Langmuir. Ademais, a CAT apresentou maior percentual de remoção de cobre, 91,59 1,93%, quando utilizado 5 g.L-1 de adsorvente.

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Remoção do Corante Têxtil Turquesa de Remazol Empregando Aguapé (Eichhornia crassipes) como Adsorvente

Cited by 10 publications

References 40 publications

Removal of Remazol brilliant violet textile dye by adsorption using rice hulls

Removal of Remazol brilliant violet textile dye by adsorption using rice hulls

Soybean hull as an alternative biosorbent to uptake a reactive textile dye from aqueous solutions

Utilização De Subprodutos Da Cadeia Produtiva Do Arroz Como Adsorventes Para a Remoção De Cobre Em Uma Solução Sintética

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