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Ion-exchange resins with particle size of 0.5mm were treated for 24h by an aqueous solution containing [Zn (NH3) 4] 2+ and then they were carbonized for 10 min in N2 at 500, 700 and 900°C. The antibacterial activity of sphericalcarbon samples containing ZnO obtained was studied by measuring the change in the electrical conductivity withbacterial growth. From the results, it was clarified that the antibacterial activity increased with increasing amount ofthe carbon samples in an incubation cell. The antibacterial activity against Staphylococcus aureus on carbon sampleswas found to be stronger than that against Escherichia coli. However, no activity for spherical carbon samples without ZnO was observed. In the results of bacteriostatic and bactericidal tests, the bactericidal effect was confirmed in the samplescarbonized at lower temperature: the effect increased with decreasing the carbonizing temperature. The appearance ofantibacterial activity was presumed to be due to the generation of H2O2 from zinc oxide in carbon samples.

Antibacterial Activity of Zn2+ Ion Exchange Resin Carbonized at Several Temperatures