掺氟和银的二氧化钛复合抗菌粉体的制备及表征

Preparation and characterization of titania antibacterial material doped by fluorine and silver

在H2TiF6溶液中添加适量硝酸银,通过热解法制备掺氟和银二氧化钛复合抗菌粉体,采用X射线衍射仪和扫描电镜等手段对复合粉体的结构、成分、粒径、形貌等性质进行表征,采用抑菌圈法对抗菌性进行分析。结果表明:于400～600℃煅烧后的复合粉体颗粒均匀细小,粒径在10～30nm之间;煅烧温度升高,粉体中氟含量降低,颗粒粒径增大,颗粒轮廓逐渐清晰,颗粒晶形趋于完整;于500℃煅烧时,二氧化钛由锐钛型向金红石型转变;煅烧温度对复合粉体的光谱吸收性能影响不明显,氟、银离子掺杂未使二氧化钛吸收带边产生红移;随着煅烧温度的升高,从复合粉体中溶出的离子减少,抗菌活性也因可溶出离子数量的减少而有所下降。

Titania powders doped by fluorine and silver were synthesized by the pyrogenation of solution containing H2TiF6 and AgNO3. The properties of the composite powder such as composition, structure, particle size, and morphology were investigated by X-ray diffraction （XRD） and scanning electron microscope （SEM）, respectively. The antibacterial activity of composite powders was evaluated by the agar diffuse test. The results show that the homogeneous particles with the diameter of about 10-30 nm is obtained as the annealing temperature is set between 400-600℃. With the increase of annealing temperature, the content of fluorine decreases and the particle size of composite powder increases. As the composite powders are annealed at 500℃, ruffle phase of titania begins to be formed. The annealing temperature has less effect on the spectra of composite powders, and ion-doping does not cause any significant shift in the fundamental absorption edge of titania. With the increase of the annealing temperature, the amount of ion release from composite powder and the antibacterial activity of composite powder decreases slightly.