Ag/TiO2空心微球的制备及光催化杀菌性能的研究

采用一步水热法,以NH4HF2作为形貌控制剂、反应温度为200℃、反应时间为12h,制备锐钛矿型TiO2空心微球,并通过紫外光还原法在TiO2表面沉积单质银.采用SEM、TEM、XRD以及EDS对样品进行表征,以罗丹明B作为模拟污染物表征样品的催化性能.锐钛矿型TiO2空心微球在40 min时降解率达93％,载银二氧化钛复合材料的光催化性能优于纯二氧化钛,当载银量达到2.5％时,光催化活性最佳,在30 min时降解率为98％.采用抑菌圈法表征其杀菌性能,其抑菌圈的直径达16 mm.

Fabrication of TiO2 Hollow Microspheres with Ag Nanoparticles and Application in Photocatalysis and Antibacterial

TiO2 hollow microspheres were prepared by a one-step hydrothermal strategy using ammonium bifluoride (NH4HF2) as a morphology controlling agent.The hydrothermal synthesis was conducted at 200 ℃ for 12 h in a vacuum oven.The surface of TiO2 has been modified with Ag nanoparticles induced by ultraviolet radiolysis.The prepared samples were characterized by scanning electron microscopy,transmission electron microscopy,X-ray diffraction,energy dispersive spectroscopy.The photocatalytic activity were evaluated by photocatalytic decolorization of Rhodamine B aqueous solution.The best result indicated that the degradation rate of TiO2 had achieved 93％ at forty minutes.The photocatalytic activity of Ag-modified TiO2 exceeds that of TiO2,and the degradation rate of Ag-modified TiO2 had achieved 98％ at thirty minutes when the mass fraction of silver was 2.5％.Bacteriostatic circle method was introduced to characterize the bactericidal performance and the antibacterial circle diameter had achieved 16 mm.