Arc process-based graphene/titanium dioxide composite material preparation method

Abstract

The invention relates to an arc process-based graphene / titanium dioxide composite material preparation method. The preparation method comprises the following steps: weighing titanium dioxide, and putting the weighed titanium dioxide between a cathode and an anode of an arc discharge apparatus; introducing a helium and air mixed gas into the arc discharge apparatus; starting the arc discharge apparatus to discharge, adjusting the current size, controlling the reaction time; and ending the discharge to prepare the graphene / titanium dioxide composite material. The method overcomes the discharge danger in hydrogen atmosphere, accelerates the reaction speed of raw materials through arc discharge, and has a short synthetic time. The method has the advantages of simple technology, convenient operation and strong practicality.

Description

technical field [0001] The invention relates to the field of inorganic composite materials, in particular to a method for preparing a graphene / titanium dioxide composite material based on an arc method and the prepared material. Background technique [0002] Graphene is a stable two-dimensional planar structure. Therefore, graphene has extremely high electrical and thermal conductivity, high specific strength and large specific surface area. When graphene is combined with other substances, composite materials with excellent performance can be prepared. Combining graphene with semiconductor materials, when the material is irradiated by light, photogenerated electrons can be injected into graphene, effectively preventing the recombination of photogenerated electrons and holes, thereby improving photocatalytic efficiency and significantly improving the performance of photocatalytic materials. [0003] Titanium dioxide (TiO 2 ) is a semiconductor material, an inorganic materia...

AI Technical Summary

Problems solved by technology

[0003] Titanium dioxide (TiO 2 ) is a semiconductor material, an inorganic material with excellent photoelectric conversion ability, long-term stability and almost non-toxic properties. It has a wide range of applications in photovoltaic solar cells, photocatalytic reactions, photocatalytic degradation, sewage treatment and other fields , but it has the disadvantage of slow degradation activity

[0009] 1. Micromechanical exfoliation method, the method is simple in process and low in cost, but it is time-consuming and laborious, the size of the prepared product is not easy to control, the repeatability is poor, and it is difficult to prepare on a large scale

[0010] 2. Chemical vapor deposition method, which can produce high-quality and large-area graphene, which can meet the requirements of large-scale preparation of high-quality graphene, but the cost is high and the process is complicated

[0011] 3. The chemical reduction of graphene oxide method generally uses a reducing agent such as hydrazine to reduce graphene oxide, and then compound it with titanium dioxide. The reducing agent used is generally toxic and not environmentally friendly, which limits its application prospects

[0012] 4. Solvothermal method, long synthesis time, complex process and low production efficiency