Equipment for preparing uniform size graphene oxide by one-step method

Abstract

The invention discloses equipment for preparing uniform size graphene oxide by one-step method. The equipment comprises an oxidation reaction kettle, a collection kettle, a stirrer and a first shearing emulsification head, the oxidation reaction kettle is placed in the collection kettle, holes are formed in the side wall of the oxidation reaction kettle, the diameter of the holes is 10-30 micrometers, and a plurality of baffles forming an included angle of 10-30 degrees with the horizontal direction are arranged on the periphery of the hole; and the stirrer extends into the center of the oxidation reaction kettle from the top, the first shear emulsification head is inserted into the oxidation reaction kettle from the bottom of the collection kettle, and a discharge valve is arranged at the bottom of the collection kettle. Under the action of stirring, shearing and turbulence, large-size graphite oxide is gradually reduced, and small-size graphite oxide enters the collection kettle through the holes, so that the size of the graphene oxide is uniformly distributed in an extremely narrow size range, the problem that the graphene oxide obtained by the existing production technology is wide in distribution is solved, and the equipment has a remarkable practical value.

Description

technical field [0001] The invention belongs to the field of equipment for preparing graphene oxide, in particular to equipment for preparing graphene oxide with uniform size in one step. Background technique [0002] Graphene is a star material in the 21st century and has received extensive attention since its inception. Because of its unique mechanical, thermal, electrical, optical, magnetic and biological properties, it is used in fields including structural materials, thermal conductive components, conductive agents, LEDs, optoelectronic chips, composite materials and biomedicine. However, graphene itself is difficult to prepare. Although graphene prepared by chemical vapor deposition (CVD) has a perfect two-dimensional structure, it is prone to defects during subsequent transfer and use, and it is difficult to mass produce and is not suitable for industrialization. application. In contrast, graphene oxide (GO), as an important derivative material of graphene, can be e...

AI Technical Summary

Problems solved by technology

However, there is a problem of wide size distribution in this method. This is because in the process of completely oxidizing graphite, graphite with small flake diameter is oxidized first, while graphite with large flake diameter takes longer to oxidize and consumes more oxidant.

However, graphite with small flake diameter preferentially consumes the oxidant and has already formed graphite oxide, and continuing to prolong the reaction time will lead to transitional oxidation and size reduction, so when the overall reaction ends, the size distribution of graphene oxide in the system is very wide, and the overall reaction time is too long

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