Preparation Of Nickel-doped Titanium Dioxide Photocatalysts And Studies On The Catalytic Properties Of Anthraquinone Dye Simulated Wastewater

Nowadays titanium dioxide is the most potential photocatalyst for its highcatalytic activity, good chemical stability, environmental characteristic and low cost.With its large forbidden bandwidth（E=3.2eV）,however, titanium dioxide can onlyabsorb less than 387.5nm ultraviolet light and get a low availability to the sunlight.This dissertation utilize Butyl titanate as raw material, uses sol-gel method tomake nickel-doped titanium dioxide, and testify the experiment outcome by many testmethods such as XRD, SEM, UV-Vis/DRS and FT-IR. The data shows that, with thenickel doped, under the celsius degree of 550, we can get anatase titanium dioxide,which has smaller grain size, lower aggregation ability and an apparent red shift toultraviolet visible spectral reflectance.Under the microwave electrodeless ultraviolet light, by comparing with thephotocatalytic performance of standard P25, pure titanium dioxide and nickel-dopedtitanium dioxide when we set the polluted water based on anthraquinone dyes as the goaldegradation productst, we can find that the photocatalytic activity of titanium dioxide is thebest. The experiment also tell us the best condition to making nickel-doped titanium dioxideis that Tetrabutyl titanate /Ethanol is1:25, Tetrabutyl titanate /Glacial acetic acid is1:1,Tetrabutyl titanate /Distilled water is1:4, Tetrabutyl titanate /Nickel nitrate is1000:3,with two hours’calcinations of 550 Celsius degree. Under two electrodelessultraviolet lights, the nickel-doped titanium dioxide under the condition above has thehighest photocatalytic efficiency to degrade the polluted water and its decolorizationrate can reach 73.3 percents after 120 minutes.For the purpose of exploring the best condition in which Ni-TiO₂photocatalystcan degrade active brilliant blue KN-R with the irradiation of ultraviolet light, we usemicrowave electrodeless ultraviolet catalytic oxidation method and measure theabsorbance value of the polluted water caused by the dye to get the best program ofphotocatalytic degradation. We come up with the conclusion that with the irradiationof three UV lamps, when we dose 1.2g/L Ni-TiO₂into the dye which has ph of 7 andInitial start solubility of 50 mg/L, we can get the best photocatalytic effect, whichreaches a high decolorization rate of 97.8 percents and TOC degradation rate of 67.14percents after 120 minutes.And reaches a high TOC degradation rate of 95.38percents after 210 minutes. The experimental expand its utilization to visible light, overcome its shortcoming thatTiO₂photocatalytic technology can only use ultraviolet, and then help TiO₂photocatalytic technology play a better role in the actual dye wastewater processing.Therefore, the dissertation investigates the photocatalytic degradation performance ofanthraquinones active brilliant blue KN-R by Nick-doped TiO₂photocatalyst, with theirradiation of the visible light, determine that when the initial ph is 7, the initial dyeconcentration is 50mg/L，the amount of catalyst is 1.2g/L，the amount of oxidant H₂O₂is 0.5mL / L, the degradation rate of 120min active brilliant blue KN-R can reach34.02percents with the irradiation of the visible light.