Investigation On The Oxide Semiconductor Composite Photocatalytic Materials Supported On One-dimensional Carbon Materials

In the past decades, environmental problem are increasingly serious because of the continuous development of global industrialization. For degradation of organic matter in water and atmosphere, developing a pollution-free environment treatment technology, has become a very important task in modern society. Several studies have shown that semiconductors used for photocatalysts can degrade pollutants in the environment. In this background, the new type of carbon materials represented by carbon nanotubes (CNTs) and carbon fiber (CFs) have been research because of its high specific surface area and good electrical conductivity nowadays. Therefore, the oxide semiconductor composite photocatalytic materials supported on one-dimensional carbon materials were prepared in our work using the CNTs and CFs as carrier materials by the simple hydrothermal method and low temperature method. The photocatalytic activities were tested and the mechanism for the enhancement in photocatalytic activity was discussed. The main research results in this thesis are listed as follows:1. The TiO2/CNTs were prepared via hydrothermal method and low temperature method, The as-synthesized samples were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TG), etc. The results indicated that nano TiO2particles is more uniform growth in CNTs by hydrothermal method. When used for photodegrading the typical organic pollutants of MB solution under a visible light, the as-synthesized TiO2/CNTs composite materials showed enhanced photocatalytic activity than pure TiO2.2. The TiO2/CFs and ZnO/CFs composite photocatalytic materials were prepared through the low temperature method by using the CFs as carrier material, and titanium potassium oxalate (K2TiO(C2O4)2), zinc acetate (Zn(AC)2-2H2O) as the precursor. The as-synthesized samples were characterized with XRD, BET, SEM, TEM, HRTEM and TG etc. The results indicated that nano TiO2particles and nano ZnO particles were uniform growth in CFs, within nano TiO2is homogeneous acicular clusters and nano ZnO shape is sheet particles, and composite photocatalytic materials possesses high specific surface areas. When used for photodegrading the typical organic pollutants of MB solution under a visible light, the as-synthesized TiO2/CFs and ZnO/CFs composite materials showed enhanced photocatalytic activity than pure TiO2and ZnO.