Dissertation > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst

Surface Modification of Titanium Dioxide and Its Photocatalytic Properties

Author LiPengFei
Tutor YuanFuGen
School Suzhou Institute of Technology
Course Applied Chemistry
Keywords Nano - titanium dioxide Surface Modification Iron acetylacetonate Polyethylene glycol Photocatalytic Biodegradable plastic
CLC O643.36
Type Master's thesis
Year 2011
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With the continuous improvement of people's living standard, requires a healthy and clean living environment, to solve the \Semiconductor photocatalytic oxidation technology processing waste plastic into the many ways a promising photocatalytic process by chemical oxidation method, the mineralization of organic pollutants broken down into water, carbon dioxide and non-toxic organic acids. Nano-titanium dioxide as a photocatalyst chemically stable, cheap, non-toxic harmless, the advantages of the catalytic activity, an outstanding representative of semiconductor photocatalyst has good prospects and high value, scholars extensive research. Nano-titanium dioxide in the photocatalytic degradation of the polymer, there are some inherent defects, such as nanoparticles easily reunion surface lipophilic properties, polymer blends difficulties. So, we need to be modified processing, and this processing can not be damaged TiO 2 photocatalytic activity, in order to achieve the effect of comprehensive performance. Toluene 2,4 - diisocyanate, and dye photosensitizers, polyaniline, acetylacetonato complexes of rare earth complexes of iron acetylacetonate, ferrocene benzoylacetone iron complexes, β-ketone imine iron complexes a variety of reagents for surface modification of nano-titanium dioxide processing, the degradation of methyl orange as a probe reaction to evaluate the photocatalytic activity of the modified catalyst. Selected by screening better overall performance nano TiO 2 modified catalyst?? Acetylacetone iron modified TiO 2 . By means of UV-Vis, IR, XRD, SEM, fluorescence, optical microscopy analysis acetylacetone iron modified TiO 2 analysis characterization. The results show that the modified nano-TiO in 2 crystal phase is not changed, its surface of iron acetylacetonate nano TiO 2 strong interaction between particles exhibit The better dispersion effectively prevent reunion nanoparticles, the photocatalytic activity is also greatly improved. Modified Nano TiO 2 photocatalyst with polyethylene glycol blend prepared composite powder test the weight loss rate and the molecular weight of the composite powders changes, combined with the microscopic analysis of the surface morphology of the composite particles, research modified catalyst catalytic performance of light polyethylene glycol degradation. Found that the the iron acetylacetonate modified nano TiO the 2 showed higher photocatalytic degradation activity, polyethylene glycol catalytic degradation rate of the molecular weight polyethylene glycol. Polyethylene glycol molecular weight, the lower the rate of degradation. As the degradation process proceeds, the molecular weight of the polyethylene glycol is gradually decreased, the molecular weight distribution broadens. In this paper, a simple method for the preparation of novel modified nano-titanium dioxide photocatalyst improve nano-TiO 2 photocatalyst dispersion and lipophilic while improve its photocatalytic properties. These new efficient modified nano TiO 2 photocatalyst in the degradation of white pollutants has a good prospect.

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