Preparation And Performance Of Heterojuncted Titanium Electrode For Efficient Photo/Photoelectrochemical Degradation Of Organic Wastewater

With the continuous improvement of industrialization,a large amount of benzene containing substances are discharged into the natural environment.As the source of human life,water natural resources have also been greatly eroded by benzene substances,which seriously affects human health and safety.Therefore,efficient and environmentally friendly treatment of benzene containing organic compounds in water is of great significance for human life and health.In recent years,with the continuous maturity of photocatalytic technology,finding suitable photocatalytic materials has become a hot research topic in the field of photocatalysis.Titanium dioxide nanotubes,as an excellent semiconductor catalyst material,have the characteristics of good stability,large specific surface area,and easy regulation.Because of the low utilization rate,large bandgap width,and high carrier recombination efficiency of titanium dioxide in the visible light region,its application in industrial production is greatly limited.To address the above issues,TiO₂was modified to enhance its photocatalytic effect in the visible light region,and a series of characterization and performance tests were conducted.The specific research content of the paper is as follows:1.Preparation of Ag/TiO₂/g-C₃N₄and Study on Photocatalytic Degradation of NitrobenzeneFirstly,mixing ethylene glycol,ammonium fluoride,and deionized water as the electrolyte solution,a highly ordered titanium dioxide nanotube array with honeycomb structure was prepared by a two-step anodic oxidation method.Using melamine as a precursor,g-C₃N₄was load onto the surface of TiO₂vapor deposition method to obtain TiO₂/g-C₃N₄;Then,using the method of electrodeposition,silver nanoparticles were deposited onto TiO₂/g-C₃N₄at a stable voltage of 1 V to get Ag/TiO₂/g-C₃N₄,and a series of characterization and performance tests were conducted on the material.The research results show that when the mass of melamine is 0.2 g and the concentration of silver nitrate is 12.5 m M/L,the catalytic effect of Ag/TiO₂/g-C₃N₄is the best.The photocatalytic degradation efficiency of nitrobenzene is 47.6%and 57.6%,respectively,which is much higher than other samples.This indicates that Ag/TiO₂/g-C₃N₄is very effective in the degradation of nitrobenzene.The ternary composite material has good photo/photo catalytic performance and stability,and good light response to visible light,with a photocurrent density of 0.20 m A/cm².Through in-depth exploration of the photocatalytic mechanism of Ag/TiO₂/g-C₃N₄,it has been proven that Ag/TiO₂/g-C₃N₄belongs to a type II heterojunction,and the loaded Ag and g-C₃N₄enhance the oxidation-reduction ability of materials for nitrobenzene.2.Preparation of rGO/TiO₂/g-C₃N₄and Study on Photocatalytic Degradation of AcetophenoneFirstly,using in-situ synthesis method,urea was added as a precursor to the electrolyte for preparing TiO₂,and TiO₂/g-C₃N₄was obtained;Then,graphite oxide was loaded onto TiO₂/g-C₃N₄by anodic deposition,and TiO₂/g-C₃N₄/rGO materials were obtained.When the urea concentration is 0.4 g/L and the deposition time is 10 minutes,the loaded ternary composite material has the best photo/photo catalytic effect,and the photo/photo catalytic degradation efficiency of the material for acetophenone reaches 59.21%and 87.38%,respectively.It has a good response to visible light,a photocurrent density of 0.19 m A/cm²,and shows good stability.The mechanism investigation experiment shows that the prepared ternary composite belongs to the traditional heterostructure,and the loading of graphite oxide is conducive to increasing the separation and transfer of photogenerated electron hole pairs,while ensuring the high redox properties of photogenerated carriers.