Synthesis of Magnetic TiO2 Nanotubes Doped with Ag+and the Antibacterial Activity
Silver-doped TiO2 nanoparticles were synthesized using sol-gel method and were curled into nanotubes through hydrothermal reaction under concentrated alkaline condition.Subsequently,magnetic Fe3O4 particles were loaded onto the nanotubes by a co-precipitation method to form magnetic TiO2 nano-tubes doped with Ag+.The Ag+doped TiO2 nanotubes,with an average diameter of about 10 nm,were anchored with plenty of Fe3O4 particles of 10nm in diameter.The composite exhibited high antibacterial a-bility toward Escherichia coli and Staphylococcus lentus,with low minimum inhibitory concentration(100 mg·L-1)and minimum bactericidal concentration(400 mg·L-1)for both strains.Bactericidal ratio of higher than 95％could be achieved after treatment with 65 mg·L-1 of the composite for 4h.Additionally,the composite,with superparamagnetism and a high saturation magnetization of 17.26 emu·g-1,can be easily recovered after treatment,which greatly reduces the processing cost and facilitates reuse.
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