FABRICATION, CHARACTERIZATION AND PERFORMANCE OF GRAPHENE OXIDE-BASED FILTRATION DEVICES FABRICACIÓN, CARACTERIZACIÓN Y COMPORTAMIENTO DE DISPOSITIVOS DE FILTRACIÓN BASADOS EN GRAFENO
Tipo
Artigo
Data de publicação
2024
Periódico
Revista Cubana de Fisica
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0
Autores
Oliveira A.A.
Carrio J.A.G.
Carrio J.A.G.
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Resumo
© 2024 Sociedad Cubana de Fisica. All rights reserved.Graphene oxide (GO) has been the subject of numerous studies due to the anomalous water transport through membranes of layered, laminated structures. The discovery of this phenomenon opened up the possibility of using GO in various applications related to nanofluids and nanofiltration and its potential integration in separation methods in industries. In the most accepted model, a few layers of water fill two-dimensional capillaries of an interconnected structure of GO sheets. Studies have shown that high pressures can induce slight chemical modifications in GO. Using high flow rates and thin membranes is economically preferable. In this work, filtration elements based on GO were fabricated under high pressure to primarily achieve these conditions. A nanostructured device was obtained, capable of filtering for over 29 hours with stability and efficacy in different aqueous solutions of organic dyes and clay particle suspensions up to the detection limit of UV-Vis spectroscopy. Additionally, it exhibited a rejection rate of 90 % to 100 % for trivalent and divalent cations in saline solutions. A comparative study on GO treated directly with a metal and a polymeric material under high pressures is presented. The presence of the metal at high pressures led to a partial reduction of the GO, which caused significant surface modification. Conversely, the presence of the polymer helped preserve functional groups both on the surface and in the inner layers of the devices, which resulted in a structure that allowed for a constant flow of saline solutions containing organic and inorganic contaminants.