Graphene is a two-dimensional carbon nanomaterial composed of carbon atoms in a hexagonal lattice pattern resembling a honeycomb structure. It possesses physical and chemical properties such as stable structure, high conductivity, high toughness and strength, and is known as "black gold" or "the king of new materials". It has significant applications in the fields of electronics, energy storage, composite materials, aerospace, etc. China attaches great importance to the development of the graphene industry and has included graphene in the 165 major projects of the "13th Five-Year Plan".
At present, the global graphene market is mainly divided into two categories: graphene oxide (GO) and graphene nanosheets (GNP). Among them, graphene oxide holds a very high market share, accounting for more than 60% of the global market. Currently, the main methods for preparing graphene include: mechanical exfoliation, solvent exfoliation, chemical vapor deposition, crystal epitaxial growth, and oxidation-reduction methods, etc. The production efficiency of mechanical exfoliation and solvent exfoliation is relatively low; the chemical vapor deposition method and crystal epitaxial growth method are costly, have complex operations, and cannot produce large-area graphene; the oxidation-reduction method generally involves oxidizing graphite with strong acids to obtain graphene oxide; however, graphene oxide is a nanoscale ultrafine particle, and traditional filtration processes cannot achieve good solid-liquid separation, and the loss rate and water consumption of the washing process remain high, resulting in poor continuity and stability in the production of graphene oxide.
In response to the above issues, Wuhan Bona has developed an advanced ceramic membrane concentration process, which can efficiently and rapidly purify graphene with high efficiency, remove concentrated sulfuric acid and potassium and manganese ion impurities from the graphene solution, and obtain high-purity and high-concentration graphene.
Advantages of the ceramic membrane concentration process:
The ceramic membrane has the characteristics of high separation accuracy, high chemical stability and long service life. It is particularly suitable for ultra-fine particle solid-liquid separation processes in harsh chemical environments.
2. The acidic slurry containing graphene oxide can be quickly washed to neutrality, with a salt removal rate of over 99%, and there is no loss of the graphene oxide product.
3. By using the cross-flow filtration method, the membrane is less likely to be contaminated or clogged, which saves time and enhances production capacity.
4. Strong anti-pollution ability, capable of handling the dehydration and concentration of high-solid-content/high-concentration materials, resistant to acids, alkalis and organic solvents.
5. Fully automatic and intelligent control system, significantly reduces the labor burden of workers, simplifies operation and maintenance, and lowers the production costs of the enterprise.
Wuhan Bona has successfully applied ceramic membrane technology to the dehydration and concentration applications of high-solid-content/high-purity materials. If you have any requirements in this area or encounter problems with membrane filtration, please feel free to contact us at any time. Our professional technicians will be glad to assist you.
