The study of preparation and characteristic of Bi2O3/TiO2 coupled photocatalyst.

Bi2O3/TiO2 coupled photocatalyst was prepared by the hydrolysis method in the presence of water and ethanol under ultrasonic irradiation.The photocatalytic activity of the catalyst was determinated by measuring the degradation rate of rhodamine B under irradiation of UV-lamp.The results showed that adding Bi2O3 to TiO2 broadened the absorb range of solar light and greatly enhanced photocatalytic activity of TiO2,and the optimum loading of Bi2O3 was 0.25%.The various conditions including the dose of titanium oxide,the concentration of rhodamine B,the value of pH and various ion and H2O2 had different influence on degradation of rhodamine B.The photocatalytic degradation of rhodamine B follows the pseudo first-order kinetic model,and the reaction rate constant(0.057 4 min-1)was determined.