Preparation 3D graphene materials and studying their sorption properties

The study explores the potential of graphite oxide (GO) as a carbon base for the fabrication of porous sorbents and catalysts, a subject of pressing concern in the domains of water purification and organic synthesis. The research objective was to obtain three-dimensional graphene materials by chemical reduction and to study their sorption properties. Graphite oxide was synthesized using a modified Hammers method. Graphite oxide was reduced by exposure to ultrasound in an aqueous medium with ascorbic acid (AK) and ethylenediamine (EDA). Hydrogels from reduced graphite oxide (rGO) were freeze-dried. Graphite aerogels were obtained by drying hydrogels by sublimation. Aerogels were characterized by the following methods X-ray phase analysis, scanning electron microscope and energy-dispersive X-ray spectroscopy, transmission electron microscopy, IR- and Raman spectroscopy. The specific surface area (Ssa) of the carbon materials was measured using a methylene blue. The samples of rGO have different morphologies. It was hypothesised that, during the process of reduction by EDA, oxygen-containing groups would be functionalised on the surface of graphene oxide. The samples of aerogel from rGO obtained during EDA reduction were found to have the highest porosity and specific surface area relative to methylene blue. Thus, the Ssa for rGO-EDA to be 512,25±35,85 m2/g, while for rGO -Ak, it was found to be 461,03±18,44 m2/g. However, that these values are approximately half of those reported in the literature. This discrepancy can be attributed to the variation in the conditions employed for determining the specific surface area. Consequently, the rGO aerogels obtained in the present study hold promise for application in the domain of sorption technologies and catalysis, with the functionalised graphene oxide serving as a foundation for the creation of novel functional materials. It is also important to note the necessity of studying the mechanisms of oxidation and reduction of graphene in order to enhance its functionality in a variety of applications. The authors are grateful for the work and provision of data to the Collective Use Centre of the Zelinskiy Institute of Organic Chemistry of the Russian Academy of Sciences, and, in particular, for assistance in SEM microscopy imaging to senior researcher A.S. Kashin. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.

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