Photocatalytic Properties Of Composite Materials Based On TiO_2-x

Although the economic development has reached an unprecedented level,human society must face environmental damage brought by the rapid economic development.In recent years,environmental pollution is getting worse,it is urgent to develop new energy sources for protecting the environment.Developing new technologies for protecting the environment and removing organic pollutants in rivers are the current hot topics.So far,semiconductor photocatalysis technology has become one of the most effective technologies to solve the environmental and energy crisis.In this paper,new approaches are developed for the further enhancement of the photocatalytic performance of TiO_2-Xphotocatalyst.The photocatalytic properties and mechanism of the composite materials are mainly studied,the main research contents of this article are as follows:In order to prepare ordered TiO_2-Xwith different oxygen vacancy concentrations,the forced one-step hydrothermal method was used in infiltration process.In order to obtain the information of samples,the samples were characterized by XRD,XPS,SEM,BET.Then the samples were tested for their photocatalytic activity.It can be seen,that the degradation rate of Rh B by TiO_2-Xreaches 73.5%、99%、97%in 90 min,reduction rate of Cr（Ⅵ）reaches 99%,76%and 77%,the hydrogen production efficiency was0.047 mmolg^-1h^-1of S3.In order to increase the photocatalytic activity of the TiO_2-Xnanomaterials.As a substrate,TiO_2-Xnanosheets were combined with Cd S to be composite photocatalyst for enhancing the photocatalytic activity of TiO_2-X.The most suitable load was explored by adding different amounts of cadmium sulfide.Under visible light,the photocatalytic activity test indicated that the degradation rate of Rh B by F2（（CH₃COO）₂Cd 0.09g,CH₄N₂S 0.08g）within 90 min reached 99%,which was 60%higher than that of TiO_2-X,at the same time,the reduction rate of Cr（Ⅵ）is 30%higher than that of TiO_2-X.It is also confirmed that the photocatalytic performance of F2 sample is better than that of F1sample and F3 sample.The hydrogen production efficiency was 1.04375 mmolg^-1h^-1over F2 sample within 5 h under the simulated sunlight.In short,the photocatalytic performance of the product was improved after the composite of Cd S.NiS and TiO_2-Xnanosheets are used to prepare NiS/TiO_2-Xcomposite nanomaterial for further enhancing the performance of hydrogen production.Many small NiS nanoparticles were grown on the surface of TiO_2-Xnanosheets.The NiS surface can absorb H⁺easily,which is beneficial to producing hydrogen.Among the three composites,A2（0.05 g Ni（NO₃）₂,4 g Na₂S·9H₂O）sample exhibits excellent photocatalytic activity,under visible light,the efficiency achieves 92%at 90 min in degradating Rh B and 87%within 90 min in reducing Cr（Ⅵ）.In the hydrogen production experiment,the hydrogen production rate was 1.37 mmolg^-1h^-1within 5 h under the simulated sunlight.