掺银二氧化钛空心球的制备及其抗菌性能研究

以硫酸钛、尿素为原料,碳球为模板,采用水热沉淀法制备了二氧化钛空心球,以聚乙烯吡咯烷酮(PVP)为分散剂、硼氢化钾还原硝酸银的方法得到银掺杂的二氧化钛空心球。采用X射线粉末衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)、能谱仪(EDS)和傅里叶变换红外光谱仪(FT-IR)等测试手段对所得的样品进行了表征。采用抑菌圈法对其抗菌性能进行了检测,实验结果表明,在自然光条件下,商品二氧化钛P25和二氧化钛空心球对大肠杆菌、金黄色葡萄球菌、白色念珠菌没有任何抗菌效果,而载银量9.4 mol%的二氧化钛在常温范围内对三个菌种都具有优良的抗菌性能,可用于抗菌塑料、抗菌食品包装和抗菌纺织制品等领域。

Preparation of Ag-doped TiO2 hollow spheres and their antibacterial activity

TiO₂ hollow spheres were prepared by hydrothermal precipitation method using titanium sulfate and carbamide as the original raw materials and carbon spheres as the templates, and Ag-doped TiO₂ hollow spheres were synthesized by adding KBH₄ to reduce AgNO₃ using PVP as a dispersant. The obtained samples were characterized by X-ray diffractometer, scan electron microscopy, transmission electron microscopy, energy dispersive spectrometer and infrared spectrometer. Experimental results showed that P25 and TiO₂ hollow spheres had no antibacterial effect in the inactivation of Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), and Candida albicans (C. albicans) under the natural light conditions, when inhibition zone method was tested for their antibacterial properties. But TiO₂ hollow spheres doping 9.4 mol % of the amount of Ag had excellent antibacterial properties against the above three strains at room temperature. So they can be used for antibacterial plastics, antibacterial food packaging and antibacterial textiles and other fields.