Characterization and Antifungal Performance of Nano-Silver Supported by TiO_2 on Aspergillus niger Spores

摘要

To obtain non-toxic and stable silver-nanoparticles (AgNPs), we used the incipient wetness impregnation method to enhance the adhesion between AgNPs and TiO_2 support for utilizing the strong-metal-support interaction. We selected two kinds of commercial TiO_2 (P25 and Merck) as the supports to prepare the AgNP/TiO_2 catalysts and control two thermal conditions (120 and 200 °C). Next, the Aspergillus niger (A. niger) spores were used as the model strain. The characterization of as-prepared AgNPs was analyzed and then we further evaluated the antifungal efficiency against A. niger. This study demonstrates that A. niger was significantly inhibited as increasing the loading level of the AgNPs while its supported by P25 TiO_2, and indicated that AgNPs were homogeneously dispersed onto the TiO_2 support. The optimal antifungal efficiency exhibited in the dispersion of Ag from 0.2 to 0.7μg-Ag/m~2.