Interações do lantânio com células livres e imobilizadas em alginato em regimes de batelada e contínuo

• Ano de defesa: 2014
• Autor(a) principal: Corrêa, Fernanda do Nascimento
• Orientador(a): Costa, Antonio Carlos Augusto da
• Banca de defesa: Gonçalves, Márcia Monteiro Machado , Cravo Junior, Walter Barreiro , Langone, Marta Antunes Pereira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Engenharia Química
• Departamento: Centro de Tecnologia e Ciências::Instituto de Química
• País: BR
• Palavras-chave em Português: Lantânio; biossorção; microalgas; imobilização; processos de batelada e dinâmico
• Palavras-chave em Inglês: Lanthanum; biosorption; microalgae; immobilization; batch and dynamic processes
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA::TECNOLOGIA QUIMICA
• Link de acesso: http://www.bdtd.uerj.br/handle/1/11996

This study aimed to describe the potential of lanthanum biosorption by microalgal Ankistrodesmus sp. and Golenkinia sp. free and calcium alginate pellets with and without immobilized microalgae from aqueous solutions. To study this system in batch and fixed bed column were performed. Kinetic models of pseudo first-order and second order and equilibrium isotherms of Langmuir and Freundlich were used for the quantitative description and prediction of the behavior of metal adsorption by free and immobilized biomass in a batch system. The data were best fitted by a second-order kinetic model, with coefficients of determination (r2) values greater than 0.98. Very short equilibrium times were obtained in the range of 1-30 minutes. The Langmuir isotherm was the best fit to the experimental data, with r2 values greater than 0.94. qmax, that is, the maximum amount of metal captured by the biosorbent, values between 0.96 and 10.43 mmol/g were observed. The free cells were more efficient than with pellets characterized with and without the microorganisms. The pellets showed good potential when containing immobilized microalgae compared to pure them. In the dynamic study, 12 L of solution containing a concentration of La (III) 150 mmol/L reached by the column containing Ankistrodemsus sp. and Golenkinia sp. immobilized and pure calcium alginate pellets for 8 hours. At the end of the run, the three biosorbents still showed about 80% removal efficiency. Thus, the saturation point was not reached. The rapid and high adsorption capacity of microalgae revealed that its application in a higher scale is possible in both cases studied, since the immobilization of these biomaterials has not changed its sorption capacity or the rapid contact between the adsorbent and the solute in the process biosorption of lanthanum