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Publication
Biossorção do corante têxtil preto reafix super 2R com bagaço de malte
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Abstract(s)
Na indústria têxtil grandes volumes de efluentes são gerados, os quais são
caracterizados por serem coloridos e poluentes , devido à presença de corantes em sua
composição. Com a necessidade de descontaminação, diferentes métodos são utilizados
no tratamento, sendo um deles, a biossorção. Este consiste na remoção das substâncias
tóxicas recorrendo a biossorventes obtidos a partir de resíduos agrícolas e sub-produtos
de processos industriais.
O objetivo principal deste trabalho foi estudar a remoção do corante Preto
Reafix Super 2R em soluções aquosas por meio de biossorção com bagaço de malte.
Baseando-se sobretudo no estudo da cinética e equilíbrio entre o biossorvente e o
corante.
Numa primeira fase foi estudada a influência dos parâmetros operacionais, como
a influência do diâmetro médio das partículas do biossorvente, o pH da solução e a
velocidade de agitação da solução. Sendo as condições ótimas de biossorção definidas a
pH 2, velocidade de agitação de 150 rpm e biomassa sem peneiramento. Posteriormente,
ajustaram-se os modelos cinéticos de Pseudo-primeira ordem, Pseudo-segunda ordem e
de Difusão intrapartícula aos resultados experimentais obtidos pela cinética de adsorção
avaliando também a influência da temperatura no tempo de contato para se alcançar o
equilibrio. O modelo de Pseudo-segunda ordem conduziu ao melhor ajuste, com um
coeficiente de correlação (R2) de apróximadamente 1.
A partir dos testes de equilíbrio realizados com diferentes concentrações de
corante, foram ajustadas as isotermas de Langmuir, Freundlich, Tempkin aos resultados
experimentais tendo-se obtido parâmetros bastante significativos para o modelo
Langmuir, cuja capacidade máxima de remoção (qmax) obtida foi de 40,16 mg.g-1.
A análise dos parâmetros termodinâmicos permitiram avaliar que o processo de
adsorção ocorre espontaneamente, sendo endotérmico e que ao longo do processo
aumenta a aleatoriedade na interface sólido/solução, devido à desorganização do
processo em virtude das interações que ocorrem.
In the textile industry large volumes of waste are generated, which are characterized by being colored and pollutants due to the presence of dyes in its composition. With the need of decontamination, different methods are used in the treatment, one of them, the biosorption. This method consists in the removal of toxic substances using biosorbents obtained from agricultural waste and by-products of industrial processes. The main objective of this study was the removal of dye Black Reafix Super 2R in aqueous solutions by biosorption with malt bagasse. Relying primarily on the kinetic study and balance between biosorbent and dye. In the first phase it was studied the influence of the operating parameters as the influence of the average diameter of the biosorbent particles, the pH of the solution and the solution stirring speed. Being the optimal conditions of biosorption set at pH 2, stirring speed of 150 rpm and biomass without screening. Subsequently, set the kinetic models of Pseudo-first order, Pseudo-second order and intraparticle Diffusion to the experimental results obtained by the adsorption kinetics also evaluating the influence of temperature on contact time to achieve the balance. The Pseudo-second order model resulted in the best fit, with a correlation coefficient (R2) of approximately 1. From the balance tests performed with different pigment concentrations were fitted Langmuir, Freundlich and Temkin isotherms to the experimental results yielding very significant parameters for the Langmuir model whose maximum removal capacity (qmax) obtained was 40,16 mg.g-1. The analysis of the thermodynamic parameters allowed to evaluate that the adsorption process occurs spontaneously, being endothermic and throughout the process increases the randomness at the solid/solution interface due to the process disorganization because of the interactions that occur.
In the textile industry large volumes of waste are generated, which are characterized by being colored and pollutants due to the presence of dyes in its composition. With the need of decontamination, different methods are used in the treatment, one of them, the biosorption. This method consists in the removal of toxic substances using biosorbents obtained from agricultural waste and by-products of industrial processes. The main objective of this study was the removal of dye Black Reafix Super 2R in aqueous solutions by biosorption with malt bagasse. Relying primarily on the kinetic study and balance between biosorbent and dye. In the first phase it was studied the influence of the operating parameters as the influence of the average diameter of the biosorbent particles, the pH of the solution and the solution stirring speed. Being the optimal conditions of biosorption set at pH 2, stirring speed of 150 rpm and biomass without screening. Subsequently, set the kinetic models of Pseudo-first order, Pseudo-second order and intraparticle Diffusion to the experimental results obtained by the adsorption kinetics also evaluating the influence of temperature on contact time to achieve the balance. The Pseudo-second order model resulted in the best fit, with a correlation coefficient (R2) of approximately 1. From the balance tests performed with different pigment concentrations were fitted Langmuir, Freundlich and Temkin isotherms to the experimental results yielding very significant parameters for the Langmuir model whose maximum removal capacity (qmax) obtained was 40,16 mg.g-1. The analysis of the thermodynamic parameters allowed to evaluate that the adsorption process occurs spontaneously, being endothermic and throughout the process increases the randomness at the solid/solution interface due to the process disorganization because of the interactions that occur.
Description
Mestrado de dupla diplomação com a UTFPR - Universidade Tecnológica Federal do Paraná