中文摘要：

目的通过贵金属负载来提高Ti O2光催化抑菌性能。方法利用光沉积法制备Pt/Ti O2,通过XRD,UV-Vis漫反射吸收光谱和TEM对样品进行表征,Ti O2为锐钛矿和金红石型混晶,经过Pt担载之后Ti O2对光的吸收增强。利用溶液振荡法,以大肠杆菌为目标物,研究在光照和非光照条件下Ti O2和Pt/Ti O2的抑菌性能。结果在光照条件下,Ti O2的抑菌率为45%,Pt担载质量分数为10%的Ti O2的抑菌率为60%,Pt担载之后Ti O2的抑菌率提高了15%。结论 Ti O2光催化剂具有抑制大肠杆菌生长的性能,负载Pt后,由于Pt的化学势较低,光生电子被富集到Pt的表面,减小了光生电子和光生空穴复合的几率,更多的光生空穴被游离出来,因此Pt/Ti O2的抑菌性能得到了提高。

英文摘要：

This experiment aimed to improve the antibacterial activities of TiO2 by loading the noble metal Pt on its surface. Pt/TiO2 photocatalysts were prepared by photodeposition. X-ray diffraction technology （XRD）, UV-visible diffuse reflectance spectra and transmission electron microscopy （TEM） were used to characterize photocatalysts. TiO2 was the mixture of futile and anatase crystals. Intensity of light adsorption for TiO2 was increased dramatically after Pt loading. Antibacterial activities of noble metal loaded and non-loaded photocatalysts to inhibit reproduction of Escherichia coli under UV irradiation were studied by solution oscillation method. Under irradiation, the bacterial inhibition rate was 45% for TiO2 and 60% for TiO2 with 10% Pt, indicating that the bacterial inhibition rate of TiO2 loaded with 10% Pt was increased by 15%. The results showed that TiO2 possessed antibacterial activity to inhibit reproduction of Escherichia coll. After Pt particles were loaded on TiO2, photogenerated electrons were enriched on the surface of Pt due to the lower chemical potential of Pt. The probability of recombination of photogenerated electrons and photogenerated holes was reduced. More photogenerated holes were free, therefore, the antibacterial activity of Pt/TiO2 was improved.