Synthesis of titanium dioxide sol was prepared by sol-gel method, using tetrabutyl titanate as source, ethanol as solvent, acetic acid as complexing agent. A transparent sol aging in air 30min, titanium dioxide films were prepared by using spin coating method. Congo red degradation was investigated by TiO2photocatalysis. Study the efficiency of decolorization was influenced by the coating times, heat-treated time, the initial concentration of congo red and solution pH.

In this paper, titanium tetrachloride with inorganic salts as raw materials in the experiment, TiO2 is prepared by the hydrolyzation method in (NH4)2SO4-modified TiCl4 solution, the maximal photocatalytic activity is observed at the mole ratio of TiCl4: (NH4)2SO4=1:2, the water-bath temperature of 90°C. The photocatalytic degradation efficiency is influenced by the initial cresol red concentration, the solution pH, irradiation time and the UV irradiation intensity. The short degradation time shows that the nanometer TiO2 can be used as an easy and efficient method to degrade the cresol red solution in wastewater.

This paper explores the sol-gel titanium dioxide the conditions of experiments to determine the best conditions. The photodegradation capability of alizarin red has been enhanced by using immobilized TiO2 particles, where the titanium sol synthesized by a sol-gel method was used as the binder for the immobilization. Optimal conditions of TiO2 film, alizarin red concentration, solution pH, and UV irradiation intensity have been found to enhance the photodegradation efficiency.

N-butyl Pyridine Nitrate ionic liquid is prepared by the double decomposition reaction of BPC and NaNO3. The ionic liquid at room temperature used in the experiment has a significant absorption determined by UV spectrum within the range of 200-400nm, the maximum absorption wavelength of BP-NO3ionic liquid is 256nm. The standard working curve of BP-NO3ionic liquid is y= 0.06848x + 0.04427(R=0.99913). The recovery rate of BP-NO3ionic liquid which is between 100.2% and 102.4%, is measured by standard addition method in water.

1-methyl-3-butyl Imidazole chloride is prepared by 1–methyl imidazole and chlorinated n-butane. The synthesis reaction of 1-methyl-3-butyl imidazole tetrafluoroborate is in the acetone. The solubility of NaNO3and BMIC in acetone is not large, but due to the insolubility in acetone of reaction product NaCl and continuous precipitation from the liquid phase in the reaction process, so as to promote the reaction continuously towards forward direction. The colorless transparent and odorless BMINO3are gotten. We use infrared spectrometer for the structure characterization, it is proved that we have gotten BMINO3room temperature ionic liquids. BMIC and BMINO3ionic liquids have better solubility in H2O, ethanol, ethyl acetate, acetone, acetonitrile, and methanol, and is insoluble in the ether and cyclohexane.