Preparation Of TiO₂-based Heterojunction And Its Photocatalytic Performance Of Tetracycline Hydrochloride

Nowadays,energy shortage and environmental pollution emerge as two global problems that need to be solved urgently.It is important to find green renewable energy sources of practical importance.Solar energy has attracted the attention of researchers because of its green and non-polluting nature,widely available,and inexhaustible characteristics.Converting solar energy into energy for human use is the focus of current research.Among them,TiO₂-based nanomaterials have been widely used for photocatalytic degradation of pollutants,solar cells,and hydrogen production from water cracking because of their non-toxicity,suitable energy band location and easy preparation.The research focus of this paper is mainly based on the TiO₂nanorod arrays as the substrate,and the TiO₂nanorod arrays are modified by methods such as semiconductor modification or noble metal deposition.The morphology,composition,optical and electrical properties of the samples,photocatalytic tetracycline hydrochloride and its mechanism was researched comprehensively and systematically.Detail of the research is listed below:In the experiment,Bi₂MoO₆ nanosheets were grown on TiO₂nanorod arrays by the secondary hydrothermal method,and Bi₂Mo O₆/TiO₂heterojunction was constructed.On this basis,Ag quantum dots were deposited on the Bi₂Mo O₆/TiO₂heterojunction by photoreduction method.superior.The samples were then analyzed for their structure,morphology,composition,optical,electrochemical and catalytic properties by various characterization equipment.The experimental results show that the sample after photodeposition for 20 minutes has the best performance,the light absorption intensity increases significantly and a red-shift phenomenon occurs,and it has the maximum photocurrent density with a maximum value of 103.0μA/cm²,which is 11.7μA/cm²of the unmodified TiO₂nanorods.times.In addition,it exhibited extremely high photocatalytic activity for the degradation of tetracycline hydrochloride,with a degradation rate of 90.8%at 120 min.It is proved that the SPR effect of Ag quantum dots and the formation of Bi₂Mo O₆/TiO₂heterojunction can improve the photoelectrochemical performance and photocatalytic activity to a certain extent,and further study the degradation path and mechanism of tetracycline hydrochloride.Transition metal dichalcogenides are widely used for compounding with TiO₂due to their small band gaps to increase the light absorption range of the material.In this work,a novel Co S/Cu S/TiO₂ternary material was synthesized by a simple one-pot hydrothermal preparation method and found to have good photoelectrochemical performance by various characterization techniques.The samples were analyzed for structural,morphological and optical properties by SEM,HRTEM,XRD,DRS and XPS techniques.The photocurrent density of Co S/Cu S/TiO₂reached a maximum of 55μA/cm²,which is 7.8 times higher than that of unsensitized TiO₂NRs.With the formation of heterojunctions,the absorption of visible light and the effective separation of photogenerated charge carriers are enhanced,while the complex surface structure of the composites accelerates the migration of photogenerated charge carriers.By using xenon lamp irradiation,it was found that the photocatalytic degradation efficiency of tetracycline hydrochloride by Co S/Cu S/TiO₂was significantly improved,with a degradation rate of 64.0%,and the charge transfer mechanism was also studied.