Abstract
Among the many inorganic bacterial inhibitors available today, polyoxometalates (POM), green antimicrobial agents with extremely high antimicrobial efficiency, have received attention. Attributed to the advantages of POM with various types, variable structures, good magnetic properties, electrical conductivity and redox activity, the modification of a POM was chosen in this work. Four new polyoxometalates with Keggin structures, K7Mn(H2O)NiMo11O39·8H2O, K7Mn(H2O)ZnMo11O39·14H2O, K7Cu(H2O)NiMo11O39·8H2O and K7Cu(H2O)ZnMo11O39·14H2O, were synthesized by the liquid-phase method using Mo as the coordination atom, Mn and Cu as the heteroatoms and Ni and Zn as the substitution atoms. The structures of the four polyoxometalates were characterized by elemental analysis (AAS), infrared (FT-IR) spectroscopy, ultraviolet-visible (UV-visible) spectroscopy, thermogravimetric analysis (TG), X-ray diffraction (XRD), and scanning electron microscopy (SEM). We also analyzed the inhibition performance on four bacteria, Escherichia coli, Bacillus subtilis, Staphylococcus aureus and Bacillus cereus. Herein, we examine the bacterial inhibitory effect and the inhibition rate of the POM against bacteria by four different methods of bacterial inhibition, filter paper sheet method, Oxford cup method, MIC value determination and TTC test.
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