Application of Membrane Filtration Technology in Graphene

Application of Membrane Filtration Technology in Graphene1

Graphene is a very popular inorganic material recently, and it has received extensive attention in effect transistors, batteries, capacitors, polymer nanosynthesis, and membrane separation. Potential new membrane materials may become the next generation of mainstream membrane products.

Properties of Graphene Oxide
Graphene oxide (GO) is a honeycomb two-dimensional planar film composed of a single layer of carbon atoms. Its chemical composition is mainly composed of carbon atoms and polar oxygen-containing functional groups. GO is due to the type of oxygen-containing functional groups. And the unclear distribution makes its molecular structure controversial. Among them, the Lerf-Klinowski structure model is widely recognized, and it is concluded that there are three main functional groups in GO, namely hydroxyl and epoxy groups located on the surface, and those located at the edge. carboxyl.

GO has a two-dimensional planar structure similar to graphene. The difference is that GO introduces a large number of polar oxygen-containing functional groups on the surface of the carbon skeleton due to oxidation, such as -O-, -COOH, -OH, etc. The existence of functional groups increases the complexity of the GO structure. The GO layers are connected by a large number of hydrogen bonds, and the two-dimensional planar structure is connected by strong covalent bonds, which makes it extremely hydrophilic. GO was once regarded as a hydrophilic substance, but GO is actually amphiphilic, showing a changing trend from hydrophilic to hydrophobic from the edge to the center. The unique structure of GO gives it a large specific surface area, unique thermodynamics It has good research significance and application prospects in the fields of biology, medicine, and materials.

A few days ago, the international top journal “Nature” published the forum “Ion sieving by cations controlling the interlayer spacing of graphene oxide films”. This research proposes and realizes the precise control of graphene membranes by hydrated ions, demonstrating excellent ion sieving and seawater desalination. performance.

According to the industry, my country has paid attention to the research and development in the field of graphene earlier. Since 2012, my country has issued more than 10 graphene-related policies. In 2015, the first national level programmatic document “Several Opinions on Accelerating the Innovation and Development of the Graphene Industry” proposed to build the graphene industry into a leading industry, and to form a complete graphene industry system by 2020. A series of documents such as the 13th Five-Year Plan have included graphene into the field of new materials that have been vigorously developed. The agency predicts that the overall scale of my country’s graphene market is expected to exceed 10 billion yuan in 2017. The development of the graphene industry is accelerating, and related companies are expected to benefit.


Post time: Apr-20-2022
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