ADSORÇÃO DE AZUL DE METILENO EM ÓXIDO DE GRAFENO MAGNÉTICO E AVALIAÇÃO TOXICOLÓGICA DO ADSORVENTE EM PEIXES ZEBRA (Danio rerio) E EM ARTÊMIAS SALINAS

• Ano de defesa: 2018
• Autor(a) principal: DORFEY, Daiene
• Orientador(a): Volkmer, Tiago Moreno
• Banca de defesa: Morisso, Fernando Dal Pont, Simão, Éder Maiquel
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Franciscana
• Programa de Pós-Graduação: Programa de Pós-Graduação em Nanociências
• Departamento: Biociências e Nanomateriais
• País: Brasil
• Palavras-chave em Português: ferrita de zinco; caracterização; toxicidade.
• Palavras-chave em Inglês: zinc ferrite; characterization; toxicity.
• Área do conhecimento CNPq: Nanociências
• Link de acesso: http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/731

Water is an essential resource to all living organisms and to several human activities. The disposal of dye containing effluents on aquatic environment, such as methylene blue, causes serious environmental problems. Thus, a proper treatment of such effluents is needed before their disposal on water environment. Water and effluents treatment processes use traditional physical-chemical and biological treatments and are not efficient in removing these contaminants. Among the various techniques used for the purification of aqueous effluents, the adsorption technique stands out and, with the advancement of nanotechnology, new materials have been synthesized and gained prominence in research for their use as promising adsorbents. Graphene oxide is the newest member of the carbon allotrope family and has attracted attention for various applications because of its properties. However, in the adsorbate recovery process, after adsorption, it has been necessary centrifugations with high rotations and for a long time so that the graphene oxide collection is possible due to high dispersion of the material. Thus, the use of nanocomposites, mixtures of graphene oxide with magnetic materials, such as zinc ferrite, makes it possible to use this property so that the recovery process can be carried out more easily. The objective of this research was to study the adsorption of methylene blue on graphene oxide magnetized with zinc ferrite, dispersed in aqueous medium, as well as to study the toxicity of this compound in zebra fish (Danio rerio) and Artemia salina. Graphene oxide was prepared according to the Hummers method and zinc ferrite was prepared by combining the sol-gel route with self-ignition synthesis. The confirmation of the compounds was obtained by the characterization by XRD, FTIR, SEM, Raman spectroscopy, BET and diffuse reflectance. The toxicity was evaluated by tests on zebra fish treated with 5 and 10 mg/L of GO and GO-ZFM and on artemias salinas treated with 1, 5 and 10 mg/L of GO and GO-ZFM. There were no significant deaths due to the treatments, however more studies need to be performed to confirm the results for the toxicity of the materials to be discarded. GO-ZFM was efficient in the adsorption of methylene blue solutions containing 15, 20, 30 and 40 mg/L.