| Titanium dioxide light catalyst since it has highly active, preparation does not need to high temperature and high pressure, non-toxic, the nature is stable, rich resources cost advantages, in all walks of life all have very good applied, investigators are now on the water pollution control in the very much research. In certain conditions light, TiO2can happen light electronic and light was born in cavities born separation, born of the light of cavitation directly strong oxidation ability can make the most of the organic matter oxidation, and may through indirect oxidation will some toxic and harmful substances into avirulent and harmless form, so in environmental management area has very important meaning. But the photoelectric activity small, quantum efficiency low (less than4%), the utilization rate of the light from the sun is low, the disadvantages, such as recycling difficult, therefore, to find the right method, for example through TiO2doped with modified or preparation composite materials improve activity of catalyst efficiency and circulating sex, to realize the photocatalytic degradation contaminated water industrialization has important significance.Carbon nanotube(CNT)is considered to be ideal catalyst carriers due to its huge specific surface area, remarkable chemical stability, nanoscale hollow tube property, excellent electronic conductor and good absorbability. Herein, the author utilizes carbon nanotube as the cartier of TiO2with the aim of reducing probability of electron hole recombination, improving the photocatalytic activity of TiO2effectively, improving the absorption efficiency of visible light and developing solar energy. The subject is currently viewed as an active researching area.With the rapid development of economy, water pollution and has also been we deal with one of the difficult points of environmental problems. The current treatment technology still has some problems, such as high treatment cost, biochemical treatment microbial easy when the deactivation, difficult to complex organic matter degradation of polymer for simple low molecular material. So, looking for a highly efficient water pollution treatment methods, become the important task in the field.On the first article through the mixed acid on carbon nanotubes purify and decentralized treatment, and a hydrolysis method and explosion method for TiO2load in the nano carbon nanotubes surface compound light catalysts. Using SEM, TEM observation of the composite material morphology and coated, X-ray powder diffraction (XRD) investigation in composite material of crystal and TiO2the existence of the materials, ultraviolet visible spectrum analyzer diffuse (UV-vis diffuse characterization) compared to CNT, pure TiO2and CNT/TiO2composite material to visible light absorption performance. With common dye methyl orange for degradants investigation by the system activity of catalyst and its circulation performance, come to the conclusion is as follows1. The mixed acid ultrasound treatment carbon nanotubes, can get purification and dispersed good carbon nanotubes.2. Titanate with butyl acetate main raw material, adopts the titanium butyl acrylate acid hydrolysis method, the synthetic TiO2load in nano carbon nanotubes surface composite material, and the materials of XRD, SEM, TEM, UV-vis, RAMAN and light the catalytic degradation characterized. The result shows:after hydrolysis method for samples of methyl orange in the concentration of20mg/L, pH=2solution, reaction after four hours degradation rate can reach92.37%,4times after cycle degradation rate is only57.63%.3. Through the explosion method CNT/TiO2/Ti2O3composite materials, and the materials of XRD, SEM, TEM and light the catalytic degradation characterized. The results showed that:in the same conditions CNT/Ti2O3composite reaction after four hours degradation rate is only81.35%, but four times after recycling rate of degradation are still74.87%, circulation performance better than hydrolysis method for samples. |
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