Abstract
New layered perovskite compounds, Ag xNa 2-xLa 2Ti 3O 10 ( x=0.2,0.3 and 0.5) were synthesized by an ion-exchange reaction of Na 2La 2Ti 3O 10 with AgNO 3 solution and characterized by energy dispersive X-ray analysis(EDX), X-ray diffractometry(XRD), scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS). The ion-exchange processes were optimized, and the antibacterial activity, light permanency and water-resistance were evaluated. Surprisedly, no significant changes in crystal structure of Na 2La 2Ti 3O 10 are found by the exchange of silver ions. The Ag 0.3Na 1.7La 2Ti 3O 10 particles conglomerate obviously with irregular shape and size. Ag 0.3Na 1.7La 2Ti 3O 10, possessing the minimum inhibitory concentrations(MICs) against Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) of 180 mg/L and 240 mg/L, has high antibacterial activity, good light permanency and water-resistance. The ionic state silver in Ag xNa 2-xLa 2Ti 3O 10 is the antibacterial active component.
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