Funcionalização de nontronita do grupo Serra da Mesa do estado de Tocantins com Aspergillus niger e aplicação em processos de adsorção com o sistema Cd 2+ /Pb 2+

• Ano de defesa: 2011
• Autor(a) principal: Carvalho, Marcos Alberto de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Mato Grosso; Brasil; Instituto de Ciências Exatas e da Terra (ICET); UFMT CUC - Cuiabá; Programa de Pós-Graduação em Geociências
• Palavras-chave em Português: .; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS
• Link de acesso: http://ri.ufmt.br/handle/1/1816

The original smectite clay mineral has been collected from Tocantins States, Brazil. The natural nontronite sample was characterized by elemental analysis, scanning electron microscopy, thermal analyses, and infrared spectroscopy (FTIR). The nontronite natural sample was functionalized with the Aspergillus Niger fungus. The ability of these materials to remove divalent metals Cd2+ and Pb2+ from aqueous solution was followed by a series of adsorption isotherms at room temperature and pH 4.0. The maximum number of moles adsorbed was determined to be 0,364 and 0,016 mmol g-1 for Cd2+ and Pb2+, respectively. The kinetic data were better fitted to Lagergren pseudo-second order model. Thermodynamics indicated the existence of favorable conditions for Cd2+and Pb2+ interactions with the clay surface of natural and modified samples.