Remoção do corante Azul Reativo 5G utilizando o adsorvente comercial Dowex Optipore SD-2

• Ano de defesa: 2013
• Autor(a) principal: Oliveira, Silvia Priscila Dias de
• Orientador(a): Quiñones, Fernando Rodolfo Espinoza
• Banca de defesa: Borba, Carlos Eduardo , Pietrobelli, Juliana Martins Teixeira de Abreu
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual do Oeste do Paraná; Toledo
• Programa de Pós-Graduação: Programa de Mestrado em Engenharia Química
• Departamento: Centro de Engenharias e Ciências Exatas
• País: BR
• Palavras-chave em Português: Corante Azul Reativo 5G; Adsorvente Dowex Optipore SD-2; Adsorção; Modelos cinéticos e de equilíbrio
• Palavras-chave em Inglês: Reactive Blue 5G dye; Dowex Optipore SD-2 adsorbent; Adsorption; Kinetic and equilibrium tests
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO::ENGENHARIA ECONOMICA
• Link de acesso: http://tede.unioeste.br:8080/tede/handle/tede/1850

In this work, removal of Reactive Blue 5G dye using a commercial Dowex Optipore SD-2 adsorbent was investigated regarding variations on pH (1-12), temperature (20-50oC) and shaking (90-200 rpm) values in order to establish best adsorption conditions. The point of zero charge (pcz) was determined varying solution pH from 2 to 12 and defining the pH range where the adsorbent surface is electrically neutral. Batch kinetic experiments at pH 2 consisting on a mixture of 5 mg adsorbent and 50 mL dye solution (150 mgL-1) were performed considering four temperatures (20, 30, 40 and 50°C), under 120 rpm shaking. Regarding temperature of 30°C and shaking of 120 rpm as suitable to improve the removal of Dowex Optipore SD-2 adsorbent, batch equilibrium adsorption experiments were carried out at pH values ranging from 1 to 12 and considering dye solutions with concentration varying from 5 to 300 mg L-1. From pcz results, pH values between 4 and 10 have evidenced electrically neutral behavior on adsorbent surface. Adsorption kinetic data were interpreted according to film diffusion, superficial adsorption and pores diffusion kinetic models. Six isotherm models such as Langmuir, Freundlich and Temkin were used to describe the equilibrium data, being the Langmuir isotherm fitted better to the data with a maximum adsorption capacity (qmax) of 315 mg L-1. Performing a comparison with other adsorbents, such as orange peel, macrophyte Egeria Densa, eggshell and activated charcoal reported in literature for reactive dye removal, the Dowex Optipore SD-2 adsorbent exhibits greater adsorption capacity than the other ones, being more effective for reactive dye removal, but with a slow kinetic response.