Pjotocatalytic Degradation Of Dye By Using The Modified Support Nano TiO₂

It has bright prospect to apply nano-TiO₂ photocatalysis technique indegradation of dye pollutants in water environment treatment. However, in thewater treatment process using suspended nano-TiO₂ particles poses the problemof separations and reuse, which is not only complicated but also requires a lot ofenergy. So using a simple method to immobilize the TiO₂ particles on the carrier,in condition that the TiO₂ particles still has high photocatalytic efficiency, is avery promising research direction. In this study we used a simple electrophoresismethod to load nano-TiO₂ particles on stainless steel and glass. Throughmeasuring the absorbance of the solution of Potassium Indigo trisulfonate at610nm, drawing out the response, and comparing the kinetic parameters, wefound that the same photocatalytic reaction results are in poor reproducibility andthese catalysts have the problem of aging. To solve this problem, we resorted to asignificant regeneration named acid regeneration.Theoretically ultraviolet light with the wavelength less than 388nm can onlybe used to Photocatalize the titanium dioxide photocatalysis. However in nature,the ultraviolet light take up only 10% of the sunlight. And the artificial ultravioletlight will consume large amounts of energy. This study showed that N-dopedTiO₂ can increase the efficiency of visible light. In this study, N-doped TiO₂ wasprepared by a simple thermal method, and thin layers of catalyst were depositedby electrophoresis method onto steel substrates. The N-doped TiO₂ film showedan enhanced photocatalytic response to the decomposition of the pollutant, undervisible light, in accordance with the photoelectrochemical characterizations. Inthis study, we compared the catalysts on different carriers, and found that thecatalyst on paper (AHLSTROM Company) has a high photocatalytic activity thanthat on the stainless steel panels and glass.At the same time, this study applied the surface molecular imprintingtechnique to reseach the experiments of photocatalytic degradation of mixed dye(Rhodamine B and tartrazine). First of all, we characterized this TiO₂-MIP: TEM,XRD, FT-IR and TG, the results of which proved that we successful preparedsuch polymers. It can selectively enhance the degradation rate of rhodamine B. Instead of the target pollutant, the degradation rate of Tartrazine was significantlylower. The method of preparing such nano-TiO₂ imprinted polymer is simple,which has good application prospects.