| The development of advanced functional materials with excellent antibacterial properties is the focus of people in the contemporary society.This phenomenon is mainly due to the existence of so much bacteria and other microorganisms in people's living environment,and it involves a wide range of areas and brings great impact on people's lives.Sol-gel technology is a synthesis method that can continuously prepare inorganic-inorganic composites.The operation process is simple and easy,and it is a suitable process in the preparation of composites.In the experiment,advanced Ag-Zn antimicrobial silica composites were prepared through sol-gel technology by modifying amorphous with silver ions and zinc ions.The Ag-Zn functional composites have various properties of the composite material and unique functions of the antibacterial material,and the application fields of the antibacterial materials has expanded.In this paper,single-factor experiments and response surface methods were used to discuss the optimal process parameters for preparation of Ag-Zn antimicrobial silica composites.The effects of parameters like reaction time,silver ion concentration and zinc ion concentration on the antimicrobial properties of the composites were studied,and the preparation conditions of Ag-Zn antimicrobial composites was determined.The optimum conditions of Ag-Zn antimicrobial composites were zinc ion concentration of 0.8 mol·J-1,silver ion concentration of 9×10-5 mol·L-1i,and reaction time of 117 min.Meanwhile,it was found that the most important factor influencing the antimicrobial performance of Ag-Zn antimicrobial composites was silver ions concentration,and it was the most significant effect that the interaction of zinc ion concentration and reaction time between the in interaction of the two independent parameters on the antimicrobial properties of the composites.They were further characterized by SEM,XRD,particle size,EDS,BET,XPS,ROS,and ICP.Escherichia coli and Staphylococcus aureus were used as the bacterial species.After antimicrobial properties of composites were tested through the spread plate method,the antimicrobial mechanism of Ag-Zn antimicrobial composites was preliminary discussed.In addition,the author also added Ag-Zn antimicrobial composites to the paper in the form of coating to obtain antibacterial paper with antimicrobial properties,and studied the effect of the content of the added composites on the antimicrobial and mechanical properties of the paper.The results showed that:Ag-Zn antimicrobial composites contained bulky structure,small particle size and uniform dispersion,due to the surface of composites contained a large number of dense micro-pores,and a larger specific surface area,the material exhibited a good adsorption performance.It was revealed that the silver and zinc elements were successfully loaded on the silica support in the form of silver oxide and zinc oxide respectively and were mainly supported on the surface of the material through XPS,EDS and ICP;composites loaded with silver oxide and zinc oxide were used for E.coli and S.aureus showed the excellent antimicrobial properties,and the antimicrobial mechanism of composites was mainly found to be related to the release of reactive oxygen species(ROS)and antimicrobial ions.The characterized results of antimicrobial paper showed that the added content of antimicrobial powder material on paper had difference on the antimicrobial and mechanical properties of antimicrobial paper.In the actual application process,different content of antimicrobial powders could be added according to the performance standards of specific application products. |
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