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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 2    April 2007

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Structure and antibacterial activity of new
layered perovskite compounds
TAN Shao-zao(谭绍早)1, ZHANG Li-ling(张力玲)1, XIA Liao-yuan(夏燎原)1,
LIU Ying-liang(刘应亮)1, LI Du-xin(李笃信)2

1. Department of Chemistry, Ji’nan University, Guangzhou 510632, China;
2. State Key Laboratory of Powder Metallurgy, Central South University,
Changsha 410083, China

Abstract:New layered perovskite compounds, AgxNa2−xLa2Ti3O10 (x=0.2, 0.3 and 0.5) were synthesized by an ion-exchange reaction of Na2La2Ti3O10 with AgNO3 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 Na2La2Ti3O10 are found by the exchange of silver ions. The Ag0.3Na1.7La2Ti3O10 particles conglomerate obviously with irregular shape and size. Ag0.3Na1.7La2Ti3O10, 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 AgxNa2−xLa2Ti3O10 is the antibacterial active component.

 

Key words: layered perovskite compound; structure; antibacterial activity; ion-exchange

ISSN 1672-7029
CN 43-1423/U

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