Research On Preparation Of Micro-nano Structure And Photocatalytic Properties By Femtosecond Laser And Hydrothermal Method

With the rapid development of the industrial level in today’s society,environmental pollution and energy crisis have become important factors that seriously threaten human health and hinder the sustainable development of society.In recent years,semiconductor photocatalytic technology has flourished.It can use solar energy in nature to drive the degradation of organic pollutants and the decomposition of water to produce hydrogen,which can effectively improve environmental pollution and alleviate the energy crisis.At the same time,As a research hotspot of material surface engineering,self-supporting three-dimensional micro-nanostructures on metal substrates are widely used in many fields of science and technology.In this paper,three-dimensional micro-nanostructured anatase Ti O₂and wurtzite Zn O were prepared on the surface of Ti substrate and Zn substrate by femtosecond laser and hydrothermal method,and their photocatalytic properties were studied and analyzed.The main research contents include:Three-dimensional micro-nanostructured anatase Ti O₂can be prepared on the surface of Ti substrate by the combination of femtosecond laser and hydrothermal method,which is composed of pre-microstructure processed by femtosecond laser and nanostructure grown by hydrothermal reaction.The photocatalytic performance test results show that under the same hydrothermal reaction conditions,the photodegradation efficiency of the micro-nano structure prepared by femtosecond laser and hydrothermal method on the methyl orange solution is about 36%higher than that of the nanostructure prepared by the hydrothermal method on the flat surface,and the photocatalytic hydrogen production performance is improved by about 45%.Under the same pre-microstructure substrate,the photodegradation performance of the nanosheet structure is better than that of the nanowire structure.This is because the three-dimensional micro-nanostructured Ti O₂has the advantages of large specific surface area and strong light capture ability,as well as its superhydrophilic and superaerophobic properties,so that the reaction solution is in full contact with the material surface,promoting the photocatalytic reaction and the release of hydrogen.Three-dimensional micro-nanostructured wurtzite Zn O can be prepared on the surface of Zn substrate by the combination of femtosecond laser and hydrothermal method,which is composed of pre-microstructure processed by femtosecond laser and nanostructure grown by hydrothermal reaction.The photocatalytic performance test results show that under the same hydrothermal conditions,the photodegradation efficiency of methyl orange solution by the micro-nano structure prepared by femtosecond laser and hydrothermal method is about 43%higher than that of the nanostructure prepared by hydrothermal method on the flat surface.Under the same pre-microstructure substrate,the photodegradation performance of the needle-like nanorod structure is better than that of the pencil-like nanorod structure.This result can be attributed to the larger specific surface area,stronger light utilization efficiency and more reactive sites of micro-nanostructured wurtzite Zn O.In summary,this paper mainly studies the feasibility of combined preparation of three-dimensional micro-nanostructured materials by femtosecond laser and hydrothermal method and the influence of different morphologies on photocatalytic performance,which provides important ideas and research experience for the preparation of self-supporting three-dimensional micro-nanostructures on metal substrates and the development of photocatalysis.