Graphene is a two-dimensional carbon nanomaterial composed of carbon atoms in a hexagonal honeycomb lattice, with stable structure, high conductivity, toughness, and high strength. It is known as "black gold" and also known as the "king of new materials", and has important applications in fields such as 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: graphite oxide (GO) and graphene nanosheets (GNP). Among them, graphite oxide has a high market share, accounting for more than 60% of the global market share. Currently, the main preparation methods for graphene include mechanical stripping, solvent stripping, chemical vapor deposition, crystal epitaxial growth, and redox methods. The production efficiency of using mechanical stripping method and solvent stripping method is relatively low; Chemical vapor deposition and crystal epitaxial growth methods have high costs, complex operations, and are unable to produce large areas of graphene; The redox method is generally obtained from the oxidation of graphite by strong acid. However, graphite oxide is a nanometer sized ultrafine particle. The traditional filtration process can not achieve a good solid-liquid separation, and the product loss rate and water consumption of the washing process are high, resulting in poor continuity and stability of the production of graphite oxide.

To solve the above problems, Bona has developed an advanced Ceramic membrane concentration process, which can efficiently and quickly purify graphene, remove concentrated sulfuric acid, potassium and manganese ion impurities in graphene solution, and obtain high-purity and high concentration graphene.

Ceramic membrane concentration process flow:

Advantages of Ceramic membrane concentration process:

1. Ceramic membrane has the characteristics of high separation precision, high chemical stability and long service life, which is especially suitable for the solid-liquid separation process of ultrafine particles under harsh chemical environment;

2. The acid containing slurry of graphite oxide can be quickly washed to neutral, the salt removal rate can reach more than 99, and the graphite oxide product has no loss;

3. Adopting cross flow filtration method, the membrane is not easily polluted and blocked, saving time and improving production capacity;

4. Strong anti pollution ability, calmly facing high solid content/high concentration materials for dehydration and concentration, resistant to acid, alkali, and organic solvents.

5. The fully automatic intelligent control system reduces the labor force of workers, simplifies operation and maintenance, and reduces production costs for enterprises.

Bona Biology has successfully applied the Ceramic membrane technology to the dehydration and concentration of high solid content/high purity materials. If you have this demand or have problems in membrane filtration, please feel free to contact us, and we will have professional technicians to answer your questions.