Method for grafting carbonate on surface of graphene oxide

Abstract

The invention provides a method for grafting carbonate on the surface of graphene oxide. The method comprises the following steps of (1) preparing a graphene oxide solution from graphite by adopting a modified Hummers method, and centrifugally washing off impurities by using dilute hydrochloric acid and deionized water repeatedly; (2) adding ethanediamine to a graphene solution while vigorously stirring, reacting an oxygen-containing functional group of the graphene oxide with one amine radical of the ethanediamine under a high-temperature oil bath condition, and marking a product as a product A; (3) dropwise adding concentrated hydrochloric acid to the product A by adopting a burette under an ice bath condition, reacting the concentrated hydrochloric acid with another amine radical of the ethanediamine, and marking a product as a product B; (4) dropwise adding excessive saturated sodium carbonate solution to the product B under a water bath condition, vigorously stirring, grafting carbonate instead of chloridion on the amine radical, and marking a product as a product C; and (5) filtering and drying the product C to obtain the graphene oxide grafted with the carbonate on the surface. The method is simple, the impurities are easy to separate in the preparation process, the product is high in conversion rate, the method is suitable for large-scale preparation and production, and meanwhile, reference is provided for modification of the functional group on the surface of the graphene oxide.

Description

technical field [0001] The invention relates to a method for grafting carbonate groups, in particular to a method for grafting carbonate groups on the surface of graphene oxide. Background technique [0002] Graphene, as a popular two-dimensional nanomaterial, has received more and more attention in recent years. It has excellent mechanical, electrical, and thermal properties, and has applications in gas adsorption, micro-nano manufacturing, photocatalysis, composite material preparation, and supercapacitors. [0003] The direct capture of carbon dioxide in the atmosphere is an important means to control the concentration of atmospheric carbon dioxide, and the design and preparation of new carbon dioxide capture materials is the key point to achieve efficient and low-cost capture of carbon dioxide. Nanoporous materials such as graphene oxide have the advantages of well-developed pore structure and easy grafting and modification of surface functional groups. After special tr...

AI Technical Summary

Problems solved by technology

However, the oxygen-containing functional groups on the surface of graphene oxide are difficult to react with carbonate groups and cannot be grafted.

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