Ag/TiO_2空心微球的制备及光催化杀菌性能的研究  

Fabrication of TiO_2 Hollow Microspheres with Ag Nanoparticles and Application in Photocatalysis and Antibacterial

作　　者：李君建 李巧玲[1] 李艳[1] 蔚青[1] 石凯[1] 

机构地区：[1]中北大学理学院,山西太原030051

出　　处：《化学试剂》2017年第5期467-470,508,共5页Chemical Reagents

基　　金：国家自然科学基金资助项目(51272239)

摘　　要：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12 h,制备锐钛矿型TiO_2空心微球,并通过紫外光还原法在TiO_2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TiO_2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。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.

关 键 词：二氧化钛 空心微球 水热法 光催化 载银 

分 类 号：O643.3[理学—物理化学]