Preliminary Study On Surface Modification Of Microwave Gas-Solid Phase

In response to the environmental pollution and energy crisis in today's society,to solve this major problem in order to achieve continuous and continuous progress in society,combined with the current scientific research hot spots,in this paper we focus on the modification of the surface of the material by gas-solid phase microwaves.The surface structure changes of metal dots,graphene layers and MXene materials in solid-phase microwave system were studied respectively.The research ideas and methods of gas-solid phase microwave surface modification were summarized.It was proved that it can be used in different directions.The activity of the modified materials is greatly improved,and the solid phase treatment method is relatively simple,does not cause pollution,and consumes less energy than the conventional method.Therefore,this paper has certain guiding significance for the new method and application of material modification.The main research directions of this thesis are three:NO photocatalytic oxidation,photocatalytic hydrogen production and supercapacitors.The main research contents are as follows:Study on photocatalytic removal of NO by solid phase microwave modified GO/TiO₂ compositesSince titanium dioxide itself does not respond to microwaves,we want to use a solid phase microwave to modify it,then we need to use a sensitizer.Under this system,the sensitizer is GO,and GO can absorb the energy of microwave well.Due to the strong interaction between the two,GO transfers the absorbed microwave energy to the titanium dioxide,which makes it modified.Firstly,the GO/TiO₂composite with strong interaction is successfully synthesized by microwave hydrothermal method,followed by solid phase microwave.After the treatment,the obtained material has a marked decrease in the oxygen-containing group on the surface,and has a part of Ti³⁺,which enhances its photocatalytic oxidation of NO under visible light.2.Photocatalytic hydrogen production mechanism and properties of Pt/TiO₂composites modified by gas-solid phase microwavesThis part of the work is based on the first part of theoretical research.Due to the super-hot spot effect of nano-scale metals in solid-phase microwaves,it can act as a sensitizer in a gas-solid phase microwave system.The surface of mesoporous titania is modified,and the crystal lattice is transformed by the super heating of the metal.The original Pt/Anatase bipolar structure is transformed into the Pt/Rutile/Anatase tertiary structure,which suppresses the photogenerated electron space to a large extent.The combination of the holes enhances the hydrogen production activity,while we can maintain the integrity of the overall structure of the material.3.Gas-solid phase microwave modified N-doped MXene composites for performance study of supercapacitorsWe found that the MXene material Ti₃C₂ is a strong microwave absorbing material,and it is also an excellent conductive material.It has great application prospects in the direction of supercapacitors,so we use its microwave absorption characteristics to prepare N-doped MXene materials.Compared with pure MXene,the activity is greatly improved,and we have studied the temperature change process of MXene in gas-solid phase microwave,which proves the extensiveness of the modification method of this material.