Graphene oxide is the “twin brother” of graphene. Graphene is a member of the “carbon material family”. It is a kind of layered material formed by carbon atoms arranged in a hexagonal honeycomb structure in the plane.
Because its thickness is only about 0.335 nanometre of a carbon atom, equivalent to 1/200,000 of a hair, graphene is the thinnest material ever found. Graphene is also known as a two-dimensional material. This kind of curious two-dimensional atomic structure of graphene reveals many strange properties that ordinary three-dimensional materials do not have. The light transmittance of single-layer graphene is up to 97.7%, it was almost completely transparent by the naked eye.
It has excellent thermal conductivity, (double that diamond). Mechanically of Graphene are very strong, (200 times stronger than steel) If made a hammock by 1m2 of graphene with the thickness at 0.335 nanometres, it can carry a rabbit stably. Graphene has exceptional excellent electrical properties, with stronger conductivity much better than silver and copper, and current carrier migration rate higher than carbon nanotubes and silicon.
The application of graphene is highly anticipated based on its excellent physical characteristics. In the vastly hidden applications, the water treatment technology based on graphene is not only stayed in the theory feasible but also have made a lot of breakthroughs in implementation.
It is well known that activated carbon, as a common traditional wastewater treatment material, has many loose pores and strong in adsorption, while graphene’s strange stratified and porous structure makes its adsorption capacity at thousands of times that activated carbon. Based On this, we produced a variety of different super-efficient adsorption characteristics of graphene through microscopic adjustment & modification. The high adsorption capacity of the graphene in sewage treatment and seawater desalination provides a new solution.
In the water treatment industries such as industrial wastewater and urban sewage, they can be roughly divided into physical process and chemical treatment. The adsorption method is the most economical and effective method. Compared with traditional adsorbent like activated carbon, graphene has a specific surface area of 2630m2/g, has strong ion-exchange and adsorption properties, with only 0.335nm in thickness. It is a very promising adsorbent material.
An effective separation membrane can be obtained by introducing a Nano-pore into thin graphene. Its chemical and mechanical properties are stable, the thickness is extremely thin, and the single layer of graphene is also very good for a barrier of the smallest gas molecule of “He” The separation of performance for different molecules, ions can be achieved by control the size, shape and different functionalization of Nano-pore. It has an attractive application prospect in water treatment fields such as filtration, separation and seawater desalination, In addition, adding in the graphene surface modification after oxygen-containing functional groups form graphene oxide, this structure, and water flux protein structure are similar, the advantage is a thin layer, good hydrophilicity, high surface negative charge, high movement speed for the water molecules in the interlayer and other characteristics, can be used it to treat with positively charged pollutants, has a huge application in the field of water treatment industries.