STUDY ON THE STRUCTURE AND ANTIMICROBIAL ACTIVITY OF ZEOLITE COMPOSITE ANTIMICROBIAL AGENTS CARRYING SILVER AND CERIUM

A new type of zeolite composite antimicrobial agents was prepared by introducing silver and cerium into zeolite through ion-exchange method and characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS) and transmission electron microscopy(TEM).The antimicrobial activity and light permanency of the antimicrobial agents were also evaluated.The results of structure analysis for 4^# sample,which contained mass fraction of 3.2% of silver and 1.9% of cerium,showed that the crystalline structure of zeolite was not obviously affected by the exchange reaction except its crystal space distance with a small enhancement,and that no significant changes in crystal structure of antimicrobial agent were also found by the heat treating at less than 700℃,as well as that the composite antimicrobial agent with uniform size possessed octahedron in shape.Moreover,the activity components of silver and cerium in 4^# sample were in ionic state.The result of antimicrobial tests indicated that there existed cooperative effect of silver and cerium in composite antibacterial agent,and that the minimal inhibitory concentration(MIC) of 4^# sample against S.aereus and E.coli.were 100mg·L^-1 and 300mg·L^-1 respectively.In addition,4^# sample showed excellent light permanency.