Preparation Nanorod Array Films, Modification And Photocatalytic Properties Of TiO ₂

Currently, environmental pollution had become a major problem facing the world,in order to solve the current increasingly serious environmental pollution and achievesustainable development of environment strategy, semiconductor photocatalytictechnology attention by people. Semiconductor photocatalytic materials can convertclean and low-density solar energy resources to electricity or chemical energy resources,photocatalytic materials can take advantage of the light to degradation of organicpollutants and converted into carbon dioxide and water. Therefore, the semiconductorphotocatalytic materials has been applied research in environmental pollution control. Innumerous semiconductor photocatalyst, TiO2become a hot spot of semiconductorphotocatalysis,with high stability, low cost, ease of synthesis and many otheradvantages. However, TiO2existed many defects, such as powdered TiO2is notconducive to recycling in the application, TiO2only responds ultraviolet light, easy tocause secondary pollution problems and so on. So, preparation TiO2catalytic has visiblelight properties and easy to recycling, it is the key to solving this problem.In the paper, preparation TiO2nanorods film. Through change structure andcomposite material the way to modification of TiO2photocatalytic. The structure andphotocatalytic performance of TiO2photocatalytic was characterized by X-raydiffraction (XRD), Raman spectroscopy (Raman), X-ray photoelectron spectroscopy(XPS), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope(SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectionspectroscopy (UV-visDRS), and photocatalytic degradation of Reactive Red X-3B.The preparation of TiO2photocatalytic nanomaterials was easy to recycle andexcellent photocatalytic effect. Using FTO as substrate, successful preparation of theTiO2nanorods film in butyl titanate concentration of0.05mol/L and hydrothermalreaction time was20h. The results show that synthetic materials with TiO2thin film had one-dimensional nanorod structure and rutile phase. The degradation of Reactive RedX-3B dye shows, TiO2nanorods film materials degradation rate was85.94%in6h.TiO2nanorods film materials high mechanical strength, do not fall off from FTOsubstrate.To improve the photocatalytic effect of thin film materials and enhance electronic-hole separation capabilities. Semiconductor composite Fe2O3/TiO2film materials wasprepared in TiO2nanorods film,. Characterization results show, Fe2O3grown on thesurface of TiO2nanorods film, and the shape is tower.The photocatalytic degradation ofReactive Red X-3B experiments show, Fe2O3/TiO2nanorods film degradation rate ofReactive Red X-3B was96.17%, better than pure TiO2nanorod films. The modifiedcomposite material was smaller resistance value, the more favorable of photoproductionelectronic transmission and to promote electrons photogenerated electron-holeseparation performance. Linear voltammetry tests show that the compositesemiconductor material Fe2O3/TiO2nanorods film photocurrent density was0.13mA·cm-2, nearly increased5times.Fe2O3/TiO2nanorods film can reused many times,Fe2O3and TiO2combine more closely.Synthetic materials of Ag/TiO2nanorods film by ultraviolet light reduction method,to make the film material response under visible light. The results showed, TiO2nanorods film surface coated with a layer of Ag0, Successfully improve the materialutilization of light energy. Degradation of Reactive Red X-3B showed that the modifiedAg/TiO2nanorod films degradation efficiency was92.32%, higher than the pure TiO2nanorods film. Ag/TiO2nanorod films after reuse still maintained higher photocatalyticactivity. Silver is not lost on the surface of Ag/TiO2nanorods film materials. Linearvoltammetry tests show that the composite semiconductor material Ag/TiO2nanorodsfilm photocurrent density was0.064mA·cm-2, nearly increased2.5times.