Synthesis And Photocatalytic Properties Of TiO₂Based Nano Material With Special Morphology

Semiconductor photocatalytic nanomaterials caused widespread concern and the generalinterest in the scientific community with excellent optical properties, catalytic properties andphotovoltaic performance. It is well-known that Is well known, titanium dioxide is one of themost widely used semiconductor catalyst, its catalytic efficiency depends on its size,composition, crystal phase, crystallinity, specific surface area and morphology. Therefore, thecontrol of morphology for the titania dioxide is an important issue for optimize theperformance. At the same time, nano-titanium dioxide and other materials are also complex toimprove the photocatalytic performance effectively. This paper constructs hollow core-shellstructure,3D structure, hollow structural nanocomposites, and discusses their formationmechanism and photocatalytic properties. The main contents are as follows:(1) Hollow core-shell structure of CeO2@TiO2composites (HCSCTs) were synthesed byprecipitation-hydrothermal method. The samples were characterized by TEM, XRD, FT-IR,DRS, PL, etc. The results showed that the products have uniform distribution, uniformparticle size, the lower degree of aggregation, high purity and other characteristics. Thephotocatalytic properties of CeO2@TiO2hollow core-shell nanoparticles were tested, andexplored the photocatalytic photocatalytic mechanism. The results indicated that the productsexhibit excellent photocatalytic properties.(2) Graphite oxide were prepared using an improved method Hummers,3D structure ofTiO2/RGO composite (HTGC) with good catalytic performance were prepared byhydrothermal method. Samples were characterized by TEM, XRD, FT-IR, XPS, DRS, PL andother means. The results show that,3D structure titania nanoparticles uniformly deposited onthe reduction of graphene oxide, and GO is reduced to RGO by hydrothermal processes. Inaddition, their applications in photocatalysis were discussed. The results showed that,compared to the hollow titania nanoparticles,3D structures TiO2/RGO composite exhibitedexcellent photocatalytic properties. In addition, the formation mechanism of the product was also discussed.(3) A series of different doping ratio of hollow TiO2:Ce3+nanoparticles were synthesizedby one-step solvothermal method,using carbon microspheres as templates,then calcinations.Products were characterized by XRD, TEM, DRS and other means of the analysis. the resultsshowed that hollow TiO2:Ce3+nanoparticles have uniform size, good monodispersity.Photocatalytic activity of cerium doped with different proportions of hollow titaniananoparticles were also analyzed. Rhodamine B has been elected to the target contaminantsfor testing photocatalytic activity. Comparative test have been done to analyze the optimalamount of photocatalyst in the ultraviolet and visible light, respectively.