Cobalt-doped titania(Co-TiO2)nanomaterials were synthesized by the sol–gel method at different calcination temperatures.Using Escherichia coli(a),Staphylococcus aureus(b)and Candida albicans(c)as target strains,the a...Cobalt-doped titania(Co-TiO2)nanomaterials were synthesized by the sol–gel method at different calcination temperatures.Using Escherichia coli(a),Staphylococcus aureus(b)and Candida albicans(c)as target strains,the antibacterial activity in visible light of the nanomaterials were studied.Co-TiO2 nanomaterials were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),UV–Vis diffuse reflectance spectroscopy(DRS),Fourier transform infrared spectrum(FT-IR)and X-ray photoelectron spectroscopy(XPS).The Co ions in the Co-TiO2 nanomaterial exist in the form of CoTiO3 phase.The antibacterial properties of Co-TiO2 nanomaterials on E.coli(a),S.aureus(b)and C.albicans(c)were investigated with the oscillating flask method and the inhibition zone method.The nanomaterials calcined at 600°C exhibit excellent antibacterial activity.The bacteriostatic rates for E.coli,S.aureus and C.albicans reached 99.5%,91.3%and 93.4%respectively.The diameters of the antibacterial rings were up to 36 mm,37 mm,30 mm respectively,and the clarity of the ring was clear.The antibacterial properties of Co-TiO2 nanomaterials were compared with those of traditional silver sol,zinc oxide sol and Zn-doped TiO2 nanomaterials The mechanism of the influences of Co ions doping on the antibacterial activity of TiO2 nanomaterials was also discussed.The doping of Co ions inhibits the particle size of the antibacterial agent and extends the photocatalytic response range,thereby improving the photocatalytic performance of the antibacterial agent.展开更多
The theory of an ＂ammonia fountain＂ was developed to synthesize a CoTiO3 nanoporous matrix using a modified co-precipitation method at the interface of the aqueous solution and the saturated NH3 atmosphere. On the b...The theory of an ＂ammonia fountain＂ was developed to synthesize a CoTiO3 nanoporous matrix using a modified co-precipitation method at the interface of the aqueous solution and the saturated NH3 atmosphere. On the basis of this theory, for the first time, a new assumption was expanded to show the regular （re）arrangement of metal cations near to the surface of the solution. The morphology of the CoTiO3 phase was observed using SEM. The result indicates the nano-narrow formation of CoTiO3 particles. The size of the particles was calculated at about 27 nm. From the XRD patterns, the formation of cobalt titanate nanoparticles was confirmed.展开更多
基金the support from the National Natural Science Foundation of China(No.51474056)。
文摘Cobalt-doped titania(Co-TiO2)nanomaterials were synthesized by the sol–gel method at different calcination temperatures.Using Escherichia coli(a),Staphylococcus aureus(b)and Candida albicans(c)as target strains,the antibacterial activity in visible light of the nanomaterials were studied.Co-TiO2 nanomaterials were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),UV–Vis diffuse reflectance spectroscopy(DRS),Fourier transform infrared spectrum(FT-IR)and X-ray photoelectron spectroscopy(XPS).The Co ions in the Co-TiO2 nanomaterial exist in the form of CoTiO3 phase.The antibacterial properties of Co-TiO2 nanomaterials on E.coli(a),S.aureus(b)and C.albicans(c)were investigated with the oscillating flask method and the inhibition zone method.The nanomaterials calcined at 600°C exhibit excellent antibacterial activity.The bacteriostatic rates for E.coli,S.aureus and C.albicans reached 99.5%,91.3%and 93.4%respectively.The diameters of the antibacterial rings were up to 36 mm,37 mm,30 mm respectively,and the clarity of the ring was clear.The antibacterial properties of Co-TiO2 nanomaterials were compared with those of traditional silver sol,zinc oxide sol and Zn-doped TiO2 nanomaterials The mechanism of the influences of Co ions doping on the antibacterial activity of TiO2 nanomaterials was also discussed.The doping of Co ions inhibits the particle size of the antibacterial agent and extends the photocatalytic response range,thereby improving the photocatalytic performance of the antibacterial agent.
基金Iran Nanotechnology Initiative CouncilIslamic Azad University (Naragh branch) for their support
文摘The theory of an ＂ammonia fountain＂ was developed to synthesize a CoTiO3 nanoporous matrix using a modified co-precipitation method at the interface of the aqueous solution and the saturated NH3 atmosphere. On the basis of this theory, for the first time, a new assumption was expanded to show the regular （re）arrangement of metal cations near to the surface of the solution. The morphology of the CoTiO3 phase was observed using SEM. The result indicates the nano-narrow formation of CoTiO3 particles. The size of the particles was calculated at about 27 nm. From the XRD patterns, the formation of cobalt titanate nanoparticles was confirmed.
