Al_2O_3/TiO_2纳米抗菌剂的制备及性能

以TiC l4、A l2(SO4)3为原料,控制n(A l2O3)/n(TiO2)=0.2,采用液相共沉淀法制备了A l2O3/TiO2纳米抗菌剂,并用DSC-TG、XRD、UV-vis等手段研究了A l2O3复合对TiO2抗菌性能的影响。结果表明,复合A l2O3后,TiO2纳米抗菌剂经900℃煅烧后完全是锐钛矿结构;950~1 050℃为良好的混晶结构,其中,经950℃煅烧后,混晶结构中锐钛矿相质量分数约占77%,平均粒径约20 nm,可见光吸收带边红移显著,光吸收阈值由纯TiO2的380 nm红移至430 nm左右,抗菌性能好,在荧光灯下对大肠杆菌和金黄色葡萄球菌的抑菌圈直径达15mm左右。

Preparation and Properties of Al2O3/TiO2 Nanometer Antimicrobic

Al_2O_3/TiO_2 nanometer antimicrobic with n(Al_2O_3)/n(TiO_2)=0.2 was prepared by co-precipitation method using TiCl_4 and Al_2(SO_4)_3 as raw materials.The effect of composite agent Al_2O_3 on antimicrobial properties of nanometer TiO_2 was studied using DSC-TG,XRD and UVvis.The results show that nanometer TiO_2 compounded by Al_2O_3 calcined at 900 ℃ has entirely the anatase structure,and that calcined at 950～1050 ℃ has well mixed crystalline structure.TiO_2 nanocomposite calcined at 950 ℃ is well mixed crystalline structure in which the mass fraction of anatase is about 77%,the average particle size is about 20 nm,and the red shift of absorption band is remarkable,i.e.optical absorption edge extended from 380 nm of pure TiO_2(calcined at 700 ℃) to 430 nm,and the antibacterial circle reaches about 15 mm under fluorescent lamp against colibacillus and staphylococcus.