Study On The Polyester Supported N-doped Nano-TiO₂ Composite Material

In numerous photocatalytic materials, nano-Ti O2 has been used widely with its low price, stable and strong oxidizing. However, nano-Ti O2 has large forbidden band width, which also has low visible light utilization rate and is easy to reunion and difficult to recycle in water. The study found that nonmetal nitrongon doped nano-Ti O2 could forbidden band width and broaden the photoresponse to visible light range.Photocatalyst loaded onto alkali deweighting polyester fabric can solve such problem which the photocatalyst is difficult to separate from the solution after degradation and can enhance the photoactivity of photocatalyst. So nitrogen-doped nanometer Ti O2 loaded onto alkali deweighting polyester fabric of photocatalyst(nitrogen-doped nano-Ti O2/polyester) which can be excited by the visible light was prepared, to get the high-performance photocatalytic materials in this topic.In this topic, nitrogen-doped nano-Ti O2 materials(N-Ti O2) were prepared by sol-gel method with titanium tetra-n-butyl oxide and urea as precursors.Selected polyester tufts,polyester plain weave with alkali deweighting as load matrix, prepared N-Ti O2 dispersion by using a variety of dispersants. Polyester fabric was impregnated in the dispersed solution of nitrogen-doped nano-Ti O2 for acquiring the nitrogen-doped nano-Ti O2/polyester photocatalysis materials and optimized the load process. The photocatalyst was characterized by X-ray diffraction(XRD), Transmission electron micrograph(TEM), X-ray photoelect-ron spectroscopy(XPS), and UV-Visible diffusive reflectance spectroscopy(UV-Vis DRS) to analyze the microstructure and performance.The load matrix was characterized analyzed by Scanning electron microscope. The degradation of solution using photocatalysts and composite material had been investigated, in addition,the load matrix adsorption properties of the dye was studied.Results showed that N-Ti O2 materials which were prepared by sol-gel method were Nanoscale powders. N-Ti O2 nano-powder was anatase and the particle size about 10.42 nm.The absorption band edge of N-Ti O2 was widened to 590 nm and forbidden band width was reduced to 2.10 e V. The optimal process of polyester tufts, polyester plain weave with alkali deweighting was : the on weight the fabric of Na OH was 200%, reaction temperature was 70℃, reaction time was 90 min. The optimal process of preparing N-Ti O2 dispersion preparation was: 1%Emulsifier A-105: 0.25%SDBS, ultrasonic treatment 20 min, before and after the ultrasonic treatment high speed shear 15 min.Testing showed that the particle size of N-Ti O2 dispersion distribute uniformly and stability, the average particle diameter 105 nm. The best technology of composite materials prepared using imprenationmethod was:the load time was two, dipping time was 5minutes, dying temperature was120 ℃,dying time was 80 minutes. Polyester supported N-doped nano-Ti O2 composite material the degradation rate of dye can reach 93.7% under the irradiation of 250 W metal halide lamp.23 pictures,28 tables, 91 references.