Study On Air Pollution Photocatalytic Degraded By Titanium Dioxide

Now, air pollution is worsening, because of titanium dioxide photocatalytic technology can degrade some small organic and inorganic molecules and turn them into completely harmless inorganic small molecule.Its stability, the advantages of reusable, so in dealing with air pollution has advantages compared to the traditional method of environmental protection and energy saving. However, only titanium oxide powder, then, poor catalytic efficiency, the adsorption capacity is weak,and the loss at the same time easy to use, which actually limits its application.Therefore modified titanium dioxide and turn it into a solid load composite photocatalyst material is especially important. Because modified titanium dioxide photocatalysis while performing extremely dependent on the light to activate its catalytic activity,However, in some special circumstances, the natural light is relatively weak,low photocatalytic efficiency, In this experiment, without introducing artificial light through an optical fiber to the use of natural light projected onto the photocatalytic system in the past, reached the photocatalytic effect of green, energy-saving and environmentally friendly.Self-made titanium dioxide powder were EDS, TEM, XRD, UV-Vis characteriza-tion,Selection of high aluminate cement load modified titania prepared composite photocatalyst material, and its TEM. Formaldehyde,ammonia and toluene simulation substrate Photocatalytic properties of the material. Investigate the composition ratio of composite materials, the light reaction and dark reaction, light intensity, adsorption and reuse of photocatalytic photocatalytic material effect. Formaldehyde as substrates to study the introduction of the experimental light through fiber optic lighting conditions change would not affect the photocatalytic efficiency, study the composition ratio of composite materials in nano-titanium dioxide photocatalytic reaction with high aluminate composite photocatalyst material, the light reaction and a dark reaction, light intensity, adsorption and reuse of photocatalytic photocatalytic material effect. And on this basis, by changing the fiber diameter, length, angle, and conducting a light converging these changes can not be tested by varying the intensity of the received light to change the photocatalytic effect of the photocatalytic composite. Results are as follows:(1) self-made nano titanium dioxide powder mixed and other N, S, and C non-metallic elements,TEM characterization results show that self-modified titanium dioxide powder dispersion, no reunion phenomenon, XRD analysis concluded that self-modified titanium dioxide powder is a mixture of anatase and rutile crystal forms, the average particle size of the powder is about 9.3nm, UV-Vis figure shows, homemade modified nano titanium dioxide powder bandgap energy of 2.03 ev, High aluminate cement and homemade modified nano titanium dioxide powder according to the 4: 1 ratio mix prepared TEM images showed photocatalytic materials,Most of titanium dioxide embedded in high aluminate cement surface, and not covered by high aluminate internally, Homemade modified nano titanium dioxide powder and high aluminate cement composite photocatalyst material has a very high photocatalytic effect.(2) study the photocatalytic titanium dioxide with high aluminate composite photocatalytic material degradation formaldehyde and ammonia as the experimental substrate,High aluminate cement and homemade modified titanium dioxide by 8: 2 composite film material prepared for the degradation efficiency of formaldehyde and ammonia highest,High aluminosilicate material help absorb formaldehyde and ammonia, Catalytic efficiency of the light reaction is much higher than the catalytic efficiency of the dark reaction,In 35 W, 20 W energy-saving light shines two conditions photocatalytic experiment formaldehyde and ammonia, Degradation efficiency of formaldehyde and ammonia no big changes. Same photocatalytic film material was repeated three times Photocatalytic Degradation of Formaldehyde experimental results are basically the same each time, Ideal composite photocatalyst material reuse effect. Of toluene content analysis by gas chromatography proved photocatalytic composite film material can effectively remove the air of toluene, Toluene removal efficiency reached 86.96%.(3)In the environment of weak light source, optical fiber can be achieved through long-distance transmission of light.Experiment 6 with an outer diameter of 8.6 mm and the core 4 the core outer diameter of 5 mm fiber into a light source,found that the introduction of the light source does not change the lighting conditions to enhance the photocatalytic composite photocatalytic efficiency of methyl orange; Experimental 2m, 4m and 6m fiber source introducing light conditions, proved only by shortening the length of the fiber composite materials to enhance the photocatalytic efficiency of photocatalytic methyl orange is not feasible; Degree of curvature of the three groups of light through the optical fiber is converted into 60 °, 120 ° and 180 °, the introduction of the light source lighting conditions, experimental results prove that the photocatalytic composite photocatalytic efficiency of methyl orange little change; On the introduction of light through an optical fiber condenses,analysis can not be significantly enhanced photocatalytic composite photocatalytic efficiency of methyl orange.Self-made nano-titanium dioxide as the main body, with high aluminate cement carrier prepared composite photocatalyst material,it has strong stability, easy loss, simple composite film-forming process, re-use and easy recycling rate, etc. Cement is also high adsorption characteristics of air pollutants.Under special circumstances, The introduction of light through an optical fiber,can effectively enhance the photocatalytic properties of the composite photocatalytic materials, this photocatalytic systems have broad applications in dealing with air pollution.