Towards the understanding of the graphene oxide structure: How to control the formation of humic- and fulvic-like oxidized debris

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Título: Towards the understanding of the graphene oxide structure: How to control the formation of humic- and fulvic-like oxidized debris
Autor/es: Rodríguez Pastor, Iluminada | Ramos Fernández, Gloria | Varela Rizo, Helena | Terrones, Mauricio | Martín Gullón, Ignacio
Grupo/s de investigación o GITE: Residuos, Pirólisis y Combustión
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos
Palabras clave: Graphene oxide structure | Oxidation reactions | Humic-like debris | Fulvic-like debris
Área/s de conocimiento: Ingeniería Química
Fecha de publicación: abr-2015
Editor: Elsevier
Cita bibliográfica: Carbon. 2015, 84: 299-309. doi:10.1016/j.carbon.2014.12.027
Resumen: Former structural models of graphene oxide (GO) indicated that it consists of graphene-like sheets with oxygen groups, and no attention was paid to the resulting sheet size. We now provide evidence of the complex GO structure consisting of large and small GO sheets (or oxidized debris). Different oxidation reactions were studied. KMnO4 derived GO consists of large sheets (20–30 wt.%), and oxidized debris deposits, which are formed by humic- and fulvic-like fragments. Large GO sheets contain oxygen groups, especially at the edges, such as carbonyl, lactone and carboxylic groups. Humic-like debris consists of an amorphous gel containing more oxygenated groups and trapped water molecules. The main desorbable fraction upon heating is the fulvic-like material, which contains oxygen groups and fragments with high edge/surface ratio. KClO3 in HNO3 or the Brodie method produces a highly oxidized material but at the flake level surface only; little oxidized debris and water contents are found. It is noteworthy that an efficient basal cutting of the graphitic planes in addition to an effective intercalation is caused by KMnO4, and the aid of NaNO3 makes this process even more effective, thus yielding large monolayers of GO and a large amount of humic- and fulvic-like substances.
Patrocinador/es: The authors thank the Government of Spain, Ministry for Economy and Competiveness, for financial support of project CTQ2013-44213-R, and Generalitat Valenciana for projects PROMETEOII/2014/007 and ISIC/2012/008. IRP thanks the Government of Spain, Ministry of Science and Education, for PhD Scholarship in the FPU program.
ISSN: 0008-6223 (Print) | 1873-3891 (Online)
DOI: 10.1016/j.carbon.2014.12.027
Idioma: eng
Tipo: info:eu-repo/semantics/article
Revisión científica: si
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Aparece en las colecciones:INV - REMAN - Artículos de Revistas

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