g-TiO2纳米复合材料的制备及其光催化性能研究

ifferent contents of Ag doped TiO2 nanocomposites were prepared by sol-gel method, using Ti(OC4H9)4 as titanium source, AgNO3 as the doping agent and C2H5OH as the solution. The size distribution of Ag-TiO2 nanoparticles were about 200nm. The structure and morphology of the samples were characterized by TEM and XRD. Afer calcined at 500℃, the Ag-TiO2 powder crystal transformed to the anatase. The photocatalytic activity was evaluated by monitoring the degradation of reactive red solution in different situations. The result indicated that the optimum condition was obtained when the mole fraction quantity of the doped Ag was 2%. In this situation, 98.1% reactive red was degraded with the irradiation time of 30 min. When the pH value was from 5 to 7, as well as the concentration of reactive red was 20mg/L, the best result of photocatalytic activity was achieved.