【摘要】 采用溶胶-凝胶法结合旋转涂膜法制备了L a、Ho掺杂T iO2光催化抗菌材料。以大肠杆菌为实验菌种,普通日光灯为光源,考察了旋转速度、稀土掺杂量、涂膜层数、烧结温度、烧结时间等因素对材料抗菌性能的影响。并采用SEM、XRD、TG-DSC等方法对材料进行了表征。结果表明,稀土掺杂T iO2光催化抗菌材料在普通日光灯照射下具备较强的抗菌性能。当旋转速度1100r/m in,镧掺杂量为x(L a)=0.3%、烧结温度550℃、烧结时间1.5h、涂膜层数为3层时,L a-T iO2抗菌性能最佳;旋转速度1100r/m in,钬掺杂量为x(Ho)=0.4%、烧结温度600℃、烧结时间1 h、涂膜层数为2层时,Ho-T iO2抗菌性能较好,且L a掺杂T iO2光催化材料抗菌性能优于Ho掺杂T iO2光催化材料,其1.5h杀菌率达92.21%。更多还原

【Abstract】 The TiO2 photocatalytic antibacterial materials doped with La and Ho were prepared respectively by sol-gel method combined with spin coating method.Choosing escherichia coli as experimental culture,fluorescent lamp as light source,the effects of various factors on the antibacterial activity,e.g.the spin speed,the doped amounts,the number of coating layers,the sintering temperature and time,were investigated.XRD,SEMand TG-DSCwereadoptedto characterize the thin films.Theresults show that the TiO2photocatalytic antibacterial materialdoped with La orHo hasexcellent antibacterial activity even under fluorescent lamp.The La-TiO2film with highest antibacterial activity is obtained at the spin speed being 1100 r/min,the doped amount of lanthanum being x(La)=0.3%,the sintering temperature being 550℃,the sintering time being 1.5h,and the number of layers being 3. Meanwhile the optimum conditions for preparing theHo-TiO2film are: the spin speed being 1100 r/min,the doped amount of holmium being x(Ho)=0.4%,the sintering temperature being 600℃,the sintering time being 1 h,and the number of layers being 2.The activity of TiO2film doped with La,whose bactericidal percentage exceeds92.21%,is higher than that of TiO2film doped with Ho.更多还原