Study On Antibacterial Properties Of Sm³⁺ And Eu³⁺ Doped TiO₂ Nanomaterials

In this paper,Sm3+doped TiO2(Sm3+-TiO2),Eu3+doped TiO2(Eu3+-TiO2)and Sm3+/Eu3+codoped TiO2(Sm3+/Eu3+-TiO2)were prepared by sol-gel method using rare-earth doping method.The effects of rare earth ion doping amount,type of surfactant and amount of addition,calcination temperature,calcination time etc.on the antibacterial properties of the materials were systematically studied.XRD,SEM,UV-Vis-DRS and FT-IR were used to analyze the phase composition,chemical composition and optical absorption properties of TiO2.Under the excitation of visible light,antibacterial properties of the prepared materials were studied by means of antibacterial ring method and flask oscillation method,and the best preparation process of antimicrobial properties was determined.XRD pattern indicated that TiO2 was transformed from an amorphous state to anatase crystal form at 360? and a rutile TiO2 phase appeared from anatase crystal at 600?.The transition temperature of doped TiO2 nanomaterials increased to 700?.This indicated that doping ions can improve the crystal transformation temperature of TiO2 and the thermal stability of anatase.The results of UV-Vis-DRS showed that the light absorption ability of TiO2 nanomaterials does not change with the change of temperature,and the doped TiO2 nanomaterials can move the absorbing sideband to the visible region and promote the photocatalytic performance.The SEM micrographs showed that the particles of TiO2 nanomaterials are homogeneous and compact,and the particle size increases with the temperature increasing.The bactericidal rate of Sm3+-TiO2 and Eu3+-TiO2 materials to E.coli and Staphylococcus aureus were all higher than 78%,while the bactericidal rate of Sm3+/Eu3+-TiO2 nanomaterials against E.coli and Staphylococcus aureus was above 95%.The bactericidal rate of the TiO2 material(35%)is greatly increased.The antibacterial ring experiment also showed that the doping of ionic materials with the doping amount,calcination temperature and different calcination time have different diameter of the antibacterial ring appears.