Preparation, Characterization And Photocatalytic Property Research Of TiO₂ Based Composites

As one of the outstanding semiconductor photocatalytic materials with excellent properties, because of these excellent properties, TiO₂ shows great potential applications in the fields of energy and environment protection. In recent years,researchers have done a lot of research work in such aspects as preparation and application of photocatalytic materials. Although the researches have gained extensive success, there are some problems need to be solved: ineffective utilization of solar energy and so on. These problems can be solved through the modifications of TiO₂.This paper studied the effects of semiconductor materials and Ag modification on the photocatalytic activity of TiO₂, and studied the morphology, structure, composition and thermal stability of the prepared composite photocatalyst. The main contents of this paper are as follows:?1? The "popcorn-like” nanostructures TiO₂ was prepared by using butyl titanate as the titanium source. The TiO₂ materials were characterized by SEM, EDS and XRD.The TiO₂ is of anatase phase, the particle diameter is about 200 nm. After 60 min's reaction, the photocatalytic degradation rate of Rhodamine B was 80.98 %.?2? The "rod-like-flower" TiO₂ was prepared by hydrothermal method with titanium oxalate as titanium source. The TiO₂ materials were characterized by SEM,EDS and XRD. The TiO₂ is of rutile phase, the particle diameter is about 200 nm.After 60 min's reaction, the photocatalytic degradation rate of Rhodamine B was75.28 %.?3? Using hydrothermal method to prepare spherical SnO₂, using method of precipitation to prepare nanostructured SnO₂, The materials were characterized by SEM?TEM and XRD.?4? Prepared spherical SnO₂@TiO₂ composite materials, and modified with Ag.The materials were characterized by SEM?XRD?EDS?XPS?TG-DTA?UV-Vis DRS and Raman. It was found that when W_TiO2/W_SnO2 was 0.6 and AgNO₃ concentration was 0.2 mol/L, the photocatalytic efficiency of the sample was the best, after 50 min's reaction, the photocatalytic degradation rate of Rhodamine B was 99.41 %.?5? Prepared nanostructure SnO₂@TiO₂ composite materials, and modified with Ag. The materials were characterized by TEM?XRD?EDS?XPS?TG-DTA?UV-Vis DRS and Raman. It was found that when W_TiO2/W_SnO2 was 0.2 and AgNO₃ concentration was 0.15 mol/L, the photocatalytic efficiency of the sample was the best,after 30 min's reaction, the photocatalytic degradation rate of Rhodamine B was99.05%.?6? Prepared Ag modified ZrO₂@TiO₂ composite materials. The materials were characterized by TEM?XRD?EDS?XPS?UV-Vis DRS and Raman. It was found that when W_TiO2/W_ZrO2 was 0.3 and AgNO₃ concentration was 0.2 mol/L, the photocatalytic efficiency was the best. After 50 min's reaction, the photocatalytic degradation rate of methylene blue was 85.69 %.