Reduction Of Graphene Oxide Technology By Microwave Plasma In Liquid

Microwave liquid phase discharge technology is an emerging plasma generation technology,because many free radicals are generated during the discharge process,such as OH free radicals,H·free radicals,O·free radicals,etc.Differently,it can be applied to different fields,such as advanced oxidation of water treatment,preparation of nanomaterials,and hydrogen production of hydrocarbons.The effective discharge of the microwave discharge in liquid system used in this experiment depends on the degree of matching between the electrode and the system,and also the working time of the electrode.Therefore,the production of an effective reaction electrode is the top priority of the experiment.In this experiment,the old electrode that was previously hand-made was replaced by a new integrated electrode original.Compared with the old electrode,there are many advantages:(1)The electrode fabrication time is reduced from 3 days to 2 hours to complete the electrode fabrication;(2)The one-time ignition success rate is 100%,and the old electrode is caused by the difference in hand-made After the production,it cannot be used,and the new electrode is found in the experiment,the 100%electrode can be discharged normally after the production;(3)The electrode has a long service life,and the new electrode can find continuous work for more than 3 hours after the experiment.The time is up to 15 hours and is not the limit working time;(4)The reaction is not polluted,the center electrode is integrated with the external ceramic,and the discharge process is resistant to high temperature and stability,and no pollutants are generated.As an emerging nanomaterial,graphene has attracted much attention due to its good physical,chemical and optical properties.There are also many methods for producing graphene such as mechanical stripping,chemical synthesis and redox.At present,the preparation of graphene by reduction method is a hot research direction.In this experiment,the reduction of liquid crystal microwave plasma is utilized to reduce the graphene oxide to obtain reduced graphene oxide.After the experiment,Uv spectroscopy,Infrared spectroscopy,Raman spectroscopy and X-ray photoelectron spectroscopy analysis showed that it is beneficial to plasma reduction of graphene oxide under acidic conditions;Quenching by adding hydroxyl groups such as methanol,ethanol and formic acid.The agent or the reducing substance or the like can effectively remove a certain oxygen-containing functional group;after the treatment,the solution changes from brownish yellow to a transparent color and a precipitate is formed and the precipitate is no longer dissolved.Finally,in the graphene oxide solution of formic acid,the C/O in the material before and after the discharge reaction increased from 1.12 to 3.09,and the oxygen content of the reduced product decreased from 45%to about 24%.