载银TiO_2/碳纳米管复合材料的制备及其催化杀菌性能

Synthesis of Ag-TiO_2/CNTs nanopartical composites and their photocatalytic activity and antiseptic property

采用溶胶-凝胶法,在450℃下煅烧制备载银TiO2/碳纳米管纳米复合材料;采用XRD、SEM以及N2吸脱附对样品的晶体结构及样品微观形貌进行表征;通过UV-vis漫反射光谱表征了复合材料对紫外可见光的吸收性能;以甲基橙为模型污染物,评价了样品紫外光光催化降解甲基橙的活性,以大肠杆菌和枯草芽孢杆菌为菌种,采用抑菌圈法表征样品的杀菌性能。结果表明,载银TiO2/碳纳米管纳米复合材料比纯Ti O2纳米颗粒有更好的紫外光光催化活性,其中掺碳纳米管(CNTs)1%(质量分数)的效果最好,紫外光照射150min,降解率达到76.5%;载银TiO2/碳纳米管纳米复合材料比TiO2纳米颗粒、Ag纳米粒子、CNTs(纯化处理后)的杀菌效果都要好很多,其中掺CNTs10%(质量分数)的样品的杀菌效果最好,抑菌圈直径达到25.8mm。

Ag-TiO2/CNTs nanopartical composites were synthesized by sol-gel method,and then obtained samples were thermally treated at 450℃. The crystal morphology and the micro-surface structures were characterized by XRD,SEM and low temperature N2 adsorption-desorption. Absorbency of composites was analyzed by UV-vis diffuse reflection spectra. Under artificial UV-light irradiation,the degradation of methylorange was used to evaluate the photo-catalytic activity of Ag-TiO2/CNTs nanopartical composites. E.coli and bacillus subtilis were used to characterize antiseptic property by bacteriostatic circle method. The result showed that the photocatalytic activity of Ag-TiO2/CNTs nanopartical composites was higher than that of pure TiO2,and Ag-TiO2/CNTs nanoparticles with 1%（mass fraction） CNTs showed the best photocatalytic activity. The degradation rate is 76.5% exposuring to ultraviolet light about 150 min. Ag-TiO2/CNTs nanopartical had much better antiseptic property than TiO2 nanopartical,Ag nanoparticles,CNTs（purified）,and Ag-TiO2/CNTs nanopartical with10%（mass fraction） CNTs showed the best antiseptic property among samples. The largest diameter of inhibition zone is 25.8mm.