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Properties And Preparation Of Graphene And Its Composites

Oct 19, 2017

With the continuous development of science and technology, graphene in the preparation has made great progress, the preparation process is generally: graphite - graphite oxide - graphene - graphene. As the structure of graphene is very stable, thermal conductivity is also very high, but also the most natural nature of the material, so it has a better electrical conductivity, thermal conductivity and mechanical properties.

At present, the preparation of graphene common chemical vapor deposition method, crystal epitaxial growth method, colloidal suspension method and micro-mechanical stripping method. The graphene used in water treatment is generally prepared by chemical means, and because of the cost and scale of preparation, oxidation reduction is usually used. Oxidation of graphene under normal circumstances by the graphite through the chemical oxidation and ultrasonic preparation derived, due to the wide range of graphite, more inexpensive, graphene oxide is conducive to large-scale production, and oxide graphene with hydroxyl, carboxyl and epoxy Oxygen-containing groups, hydrophilic, compatible with a variety of volumes, it is suitable for water treatment projects.

At present, the basic principle of common graphite oxidation is to treat graphite with strong acid, so that the formation of graphite interlayer compounds, and then add strong oxidants to its oxidation, the most common is the Hummers method, it can effectively reduce the preparation time , Improve security.

In the application of water treatment engineering, the hydrophobic and easy agglomeration of graphene itself restrains its application range. Therefore, it is the concrete of the present invention to study the composites material with strong hydrophilicity and biocompatibility. research direction. In the preparation of stone grinding composites materials, we must first know that the surface of graphene is stable and inert, difficult to be compatible with the solvent, and other inorganic (organic) materials can be compounded, so first of the graphene and nano-materials And then the composites material can be reduced to obtain graphene composites material.