南通大学学报（自然科学版）

采用溶胶凝胶法制备纳米Ag/TiO2复合材料,研究其抗菌性能和光催化性能,并以X射线衍射(XRD)、透射电镜(TEM)、X射线光电子能谱(XPS)进行表征。结果表明,复合材料不需紫外光照射即具有较强的抗菌性能,对大肠杆菌和金黄葡萄球菌产生13¹7 mm的透明抑菌圈。n(Ti):n(Ag)=20:1时,复合材料的抗菌性能最佳,抑菌圈达到17 mm,同时显示出较高的光催化活性。复合材料中,银以单质形式存在,形成纳米团簇富集在复合材料表面成为电子积累中心,减少光生电子和空穴的复合,抑制粒径的长大,促进复合材料从锐钛矿向金红石相的转移,从而提高复合材料的抗菌性能和光催化活性。

NanometerAg/TiO 2 composite materials are preparedbySol-gel method andtheirantibacterial and photocatalytic propˉerties are studied.They are characterized by XRD,TEMand XPS.Experimental results have showed that the composite materiˉals have excellent antibacterial property without UV irradiation.They have clear antibacterial circle of13～17mm.When n(Ti):n(Ag)is20:1,the antibacterial property is the best and the antibacterial circle reaches17mmwith higher photocatalytic activity.Element silver exists as elemental substance silver so that nanometer silver cluster becomes an accumulating center of electrons on the surface of the composite materials.Thus the recombination of photo-generated electrons and holes is reduced,the growth of crystal size is resisted,the change from anatase to rutile phase is accelerated,and the antibacterial property and the photocatalytic activity are enhanced.