采用溶胶-凝胶法制备稀土（Ce^3＋）掺杂纳米TiO2（纳米Ce/TiO2）,借助XRD、BET、SEM对Ce/TiO2进行表征。结果表明纳米Ce/TiO2晶型为锐钛矿,平均晶粒大小为19.95nm,比表面积为43.302m^2/g。采用超声波催化法合成了羧甲基壳聚糖（CMC）,并与Ce/TiO2复配制得羧甲基壳聚糖/Ce3＋掺杂纳米TiO2复合材料（CMC/Ce/TiO2）,借助FT-IR对CMC及CMC/Ce/TiO2复合材料进行了结构表征。初步研究了纳米Ce/TiO2、普通纳米TiO2、CMC/Ce/TiO2、CMC的抗菌性能,结果显示纳米Ce/TiO2对大肠杆菌和金黄色葡萄球菌的抗菌率分别为55%和53%,普通纳米TiO2对两种菌的抗菌率分别为50%和45%,Ce^3＋的掺杂可提高纳米TiO2的抗菌性能;CMC/Ce/TiO2对大肠杆菌和金黄色葡萄球菌的抗菌率分别达到99%和95%,CMC对两种菌的抗菌率分别为90%和80%,Ce/TiO2的复合可显著提高CMC的抗菌性能。
In this paper,nano-TiO2 powder doped with rare earth Ce^3＋（nano-Ce/TiO2） was prepared by sol-gel method and characterized by XRD,BET and SEM.The results show that the nano-Ce/TiO2 is anatase with the average particle size 19.95nm,specific surface area 43.302m2/g.Carboxymethyl chitosan（CMC） was synthesized in ultrasonic as catalyst and was composited with the nano-Ce/TiO2 to prepare a kind of antibacterial composite film（CMC/Ce/TiO2）.FT-IR is successfully used to characterize the CMC/Ce/TiO2 composite.Antibacterial property of nano-Ce/TiO2,common nano-TiO2,CMC/Ce/TiO2 and CMC was tested preliminarily.The antibacterial activity of nano-Ce/TiO2 to E-coli and staphylococcus aureus is 55% and 53% and that of common nano-TiO2 is 50% and 45% respectively.It shows that antibacterial properties of TiO2 can be improved by doping Ce^3＋.The antibacterial activity of CMC/Ce/TiO2 to E-coli and staphylococcus aureus is 99% and 95% and that of CMC is 90% and 80% respectively.That is,the antibacterial performance of CMC can be improved by compositing it with Ce/TiO2.
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