Preparation Of Supported Tio₂ By Electrospinning

The green development economy has gradually become a theme of China's current economic development.While developing industrialization,we must make use of advances in science and technology to reduce resource losses and environmental pollution caused by economic development.Due to its low preparation cost,high catalytic efficiency,low energy consumption and good stability,semiconductor materials with photocatalytic properties have gradually become a hot spot in the degradation of organic compounds.TiO2 is one of the hotspots.Normal TiO2 has a tendency to aggregate in catalysis and is not easily recycled.At the same time,due to the fact that the photogenerated electron-holes with their catalytic effects are easy to recombine and the catalytic activity is difficult to maintain for a long time,we conduct a series of studies on their enhanced specific surface area.In this paper,the combination of electrospinning technology and sol-gel technology is used to prepare high specific surface area supported TiO2.The first part of the experiment was the production of nano-sized titanium dioxide.In this part,the main influences on the preparation process including spinning voltage,receiving distance,spinning flow rate and other related parameters are studied.The flow rate is 2 mL/h,the voltage is 17 kV,the spinning distance is 14 cm,and the smallest diameter TiO2 fiber can be prepared when the amount of anhydrous ethanol is 14 g.The optimum process for preparing the minimum crystal size of the titanium oxide fiber is obtained at 450OC.The second part of the experiment examined the fabrication of three types of carriers and the study of process parameters in terms of specific surface area.Three types of carriers include SiO2,Al2O3,SiO2-A12O3.The study found that the three types of carriers all increase to a certain extent with the fiber diameter,the amount of the pore-enlarging agent increases,and the specific surface area of the polymer increases.The highest specific surface areas of the three carriers were 210 m2/g,620 m2/g,and 806 m2/g,respectively.In the third part of the experiment,the three kinds of carriers were loaded and tested for related performance.The final catalytic efficiency was reflected in the catalytic degradation of methylene blue.Through the test of the load amount,the best titanium-aluminum ratio is 4:1,the optimum titanium-to-silicon ratio is 3:7,and the optimum TBOT addition amount of the composite fiber is 1.5 g.