gc3n4tio2复合纳米材料的制备及可见光催化性能研究-preparation of gc 3n4 tio 2 composite nano-materials and study on their visible light photocatalytic properties.docx

ABSTRACTTiO2, which is nontoxic, inexpensive, stable structure and excellent photocatalytic properties, is one of the recently researches on the semiconductor photocatalyst. It can be only in response to ultraviolet light with wide forbidden band (3.2eV). While the corresponding to the energy of ultraviolet light, which wave length is less than 380 nm, accounts for 3.39% to the energy of the total energy on the entire solar spectrum wavelength range. Therefore the energy utilization of TiO2 as a photocatalyst is low. In additional, the photo-generated electron and photo-generated hole of TiO2 are easy to recombine and the efficient of photocatalysis needs to improve. As a novel non-metallic semiconductor material, g-C3N4 has an advantage on light visible response with wide forbidden band about 2.7 eV, chemical stability and thermal stability. By delocalized conjugated π bond, TiO2 can be also used for organic contamination degradation, visible decomposition of water into hydrogen and so on.To improve the photocatalysis efficient of TiO2, this paper launched a series of inexpensive and easy available industrial melamine and metatitanic acid as raw materials, prepared g-C3N4/TiO2 composite photocatalytic materials. The crystalline phases, structure, morphology, chemical form and optical performance of the samples were characterized by X-ray diffraction (XRD), Fouriertransform infrared spectroscopy (FT-IR), Transmission electron microscopy (TEM), Thermogravimetric-differential scanning calorimetry analysis (TG-DSC), the N2 gas adsorption Brunauer-Emmett-Teller method (N2-BET), X-Ray photoelectron spectroscopy (XPS), Ultraviolet–visible diffuse reflection spectroscopy (UV-vis) and Three- dimensional fluorescence spectroscopy (FS). And surveyed the calcination temperature, ratio of raw materials and roasting time on the material structure and properties of samples. Then evaluate the preparation conditions on the properties of photocatalytic materials by choosing methylen