Publicación: Evaluation of graphenic and graphitic materials on the adsorption of Triton X-100 from aqueous solution
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2021-09-01
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info:eu-repo/semantics/openAccess
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Resumen
Presently, graphenic nanomaterials are being studied as candidates for wastewater pollutant removal. In this study, two graphite oxides produced from natural graphite with different grain sizes (325 and 10 mesh), their respective reduced graphene oxides and one reduced graphene oxide with nitrogen functional groups were synthesized and tested to remove a surfactant model substrate, Triton X-100, from an aqueous solution. Kinetic experiments were carried out and adjusted to pseudo-first order equation, pseudo-second order equation, Elovich, Chain-Clayton and intra-particle diffusion models. Reduced graphene oxides displayed an instantaneous adsorption due to their accessible and hydrophobic surfaces, while graphite oxides hindered the TX100 adsorption rate due to their highly superficial oxygen content. Results from the adsorption isotherms showed that the Sips model perfectly described the TX100 adsorption behavior of these materials. Higher adsorption capacities were developed with reduced graphene oxides, being maximum for the material produced from the lower graphite grain size (qe = 3.55·10−6 mol/m2), which could be explained by a higher surface area (600 m2/g), a lower amount of superficial oxygen (O/C = 0.04) and a more defected structure (ID/IG = 0.85). Additionally, three commercial high surface area graphites in the range of 100–500 m2/g were evaluated for comparison purposes. In this case, better adsorption results were obtained with a more graphitic material, HSAG100 (qe = 1.72·10−6 mol/m2). However, the best experimental results of this study were obtained using synthesized graphenic materials.
Descripción
The registered version of this article, first published in “Environmental Pollution, Volume 284, 2021", is available online at the publisher's website: Elsevier, https://doi.org/10.1016/j.envpol.2021.117161
La versión registrada de este artículo, publicado por primera vez en “Environmental Pollution, Volume 284, 2021", está disponible en línea en el sitio web del editor: Elsevier, https://doi.org/10.1016/j.envpol.2021.117161
Categorías UNESCO
Palabras clave
reduced graphene oxide, critical micellar concentration, structural defects, functionalization, high surface area graphite
Citación
Adrián Esteban-Arranz, María Pérez-Cadenas, Vicenta Muñoz-Andrés, Antonio Guerrero-Ruiz, Evaluation of graphenic and graphitic materials on the adsorption of Triton X-100 from aqueous solution, Environmental Pollution, Volume 284, 2021, 117161, ISSN 0269-7491, https://doi.org/10.1016/j.envpol.2021.117161
Centro
Facultades y escuelas::Facultad de Ciencias
Departamento
Química Inorgánica y Química Técnica