Preparation of effective Ag-loaded zeolite antibacterial materials by solid phase ionic exchange method
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Ag-loaded antibacterial zeolite materials were prepared by a solid phase ionic exchange approach with small NaA zeolite crystals synthesized by sol–gel method as carrier, NH4NO3 and AgNO3 as raw materials. The influence of AgNO3 amount, reaction temperature, and reaction time on silver load in the zeolite was investigated. The phase composition and morphology of the Ag-loaded zeolite were also characterized. In addition, the antibacterial activity, sustained-release performance, and anti-tarnish property of the Ag-loaded zeolite were studied. The results show that the Ag-loaded zeolite was synthesized under optimum conditions. The amount of silver load in the zeolite was up to 23.45% (mass ratio). The minimum inhibitory concentration value (MIC value) was 9.17 ppm, and the diameter of inhibition zone for Escherichia coli was 16.3 mm. The MIC value was 12.50 ppm, and the diameter of inhibition zone for Staphylococcus aureus was 14.5 mm. Furthermore, the Ag-loaded zeolite materials demonstrate good sustained-release performance and anti-tarnish property.
KeywordsAg-loaded zeolite Solid phase ionic exchange method Antibacterial activity Sustained-release performance Anti-tarnish property
The authors are grateful to the financial support of Quartermaster Equipment Research Institute of General Logistics Department.