Study on Preparation and Performances of TiO2/Potassium Titanate Photocatalyst

A new carrier of catalyst was chosen. Sol-gel method was used to preparate TiO₂/potassium titanate photocatalyst. EDS shows the main peck included Ti, O, K in potassium titanate whisker. The main peak of K disappeared and the peaks of Ti, O stayed after whisker was covered. It directed that the surface of sample was covered by TiO₂. The figure of UV-vis diffuse reflection shows TiO₂/potassium had more stronger peak in ultraviolet area. In the reaction device of photochemistry, using middle-pressure mercury lamp as illumination, rhodamine B as simulant pollutant, the photocatalytic performance of TiO₂/potassium titanate was studied. The decoloration rate of TiO₂/potassium titanate which was used to deal with rhodamine B in the experiment was influenced by the pH value, light intensity, reaction temperature, aeration quantum, the dosage of catalyst and initial concentration of rhodamine B. Such conditions were chosen: pH 6, the illuminance of 250 W, the temperature of 313 K, the aeration quantum of 2.0 L/min. When the concentration of rhodamine B was 8 mg/L, the dosage of TiO₂/potassium titanate was 0.01 g/L. The decoloration rate of TiO₂/potassium titanate dealt with the rhodamine B reach over 95 % in 160 minutes, and compare with TiO₂, the decoloration rate of rhodamine B was improved 0.50-1.91 multiple.