1.Introduction
　　Titanium dioxide has been extensively studied as a photocatalyst since the discovery of its photosensitization effect by Honda and Fujishima in 1972[1].Due to its strong photo-oxidizing potential, high chemical stability, non -toxicity, and low cost, titanium dioxide has been made into various forms, such as nanopowders, colloids, films, and coatings, for environmental applications ranging from deodorization to the purification of air and water[2].
　　However, TiO2photocatalytic technology still has some key technical issues in the application of large-scale industrial. Titanium dioxide performs elegantly when utilizing ultraviolet radiation because its wide band gap of 3.2eV[3]. Though effective in the UV, TiO2is incapable of utilizing the more plentiful but lower energy radiation in the visible-light spectrum to catalyze photochemical reactions. From another point of view, it is easy to gather the catalyst, easy-poisoning deactivation and difficult to separate recycling when TiO2powder used directly[4], in addition, there’s no fixed condition of immobilization as well as lack of the photocatalytic activity in fixed-phase system.
　　The main focus of this work was to improve the reactivity of TiO2under the region of visible light and optimize the immobilization technology of nano-TiO2 . B-doped and N-doped Nano-TiO2were prepared to further enhance the Nano-TiO2photo catalyst activity by the sol-gel method in this paper. By optimizing the best technology of the preparation of TiO2film carried fabric with different elements doped TiO2sol, the influence of preparation technology of TiO2thin film carried fabric on the photo catalytic activity was studied under the irradiation of daylight, and the optimum doping ratio, the best curing temperature and curing time also were determined.
　　
　　2.Materials And Methods
　　2.1.Materials Preparation
　　Nano-TiO2was prepared via sol-gel method. Firstly, butyl titanate was dissolved in a small amount of anhydrous ethanol, and then the mixture would be slowly drip in one percent nitric acid solution under intense stirring. The reaction will continue 4~5 hours at the temperature of 30℃ and after placed some time at room temperature, the nano-TiO2sol can be got. Nitrogenous compound(urea) and Boron compound(Boric acid) are added during the reaction respectively to prepare N-doped TiO2and B-doped TiO2. Keep the same concentration of titanium dioxide sol solution. Cotton fabric as the samples were first immersed in the solution and then under the pressure of specific squeezed to a wet pickup of 70-80%, dried at 80℃ for 3 min, then cured at different temperature for different times. The treated samples were cut into 6×6cm pieces for experiment. 　2.2. Test Method
　　2.2.1 Sample Characterization
　　The X-ray diffraction (XRD) patterns obtained on a X-ray diffractometer using Cu Ka irradiation at a scan rate of 6 deg/min were used to determine the identity of any phase present and their crystalline size. The accelerating voltage and the applied current were 40 kV and 100 mA, respectively.
　　2.2.2 Test of Photocatalytic Degradation
　　
　　Figure 1. Structure of reactive Red MS
　　In this paper, photocatalytic degradation of Reactive Red MS as a model reaction to determine the photocatalytic properties of thin films. Its chemical structure is shown in Fig.1.The maximum absorption of Reactive Red MS(523nm) was obtained via scanning in the region of UV-Vis by UV-2401PC UV-Vis spectrophotometer and the absorbency of Reactive Red MS with different concentrations was determined through Vis-723 spectrophotometer at the maximum absorption wavelength of 523nm. According to the linear fitting of absorbency in different concentrations .we can obtain the connection of Reactive Red MS between concentration and absorbency as follows:
　　 C=42.54373*A+0.90353. (1)
　　( Correlation coefficient: R2 =99.72)
　　Adding Reactive Red MS solution by an equal volume and same concentration (initial concentration of 50mg / L) to glassware , and let the film fully immerse in solution. Use of visible-light as a light source then made the reaction under the light .At intervals of 30min time, absorbency of the solution was determined by the VIS-732 Visible photometric on the measured maximum absorption wavelength (λmax = 523nm). The concentration of dye can be calculated through the linear relationship between the concentration and absorbance.
　　Degradation rate (%) was calculated according to the following equation:
　　η = [(C0-Ct) / C0] x100% (2)
　　Where C0 and Ct represent the initial concentration and reaction concentration of Reactive Red MS, respectively.
　　2.2.3 UV-VIS test
　　Aliquots were withdrawn at fixed time intervals for dye concentration measurements using a UV-Vis spectrophotometer(UV-2401PC, Japan).
　　
　　3.Results And Discussion
　　3.1. XRD analysis (责任编辑：南粤论文中心)转贴于南粤论文中心: http://www.nylw.net(南粤论文中心__代写代发论文_毕业论文带写_广州职称论文代发_广州论文网）