Electrochemical investigations and antimicrobial activity of Au nanoparticles photodeposited on titania nanoparticles.

Titanium oxide nanopowder (TiO NPs) was synthesized via anodization in 0.7 M perchloric acid then annealed in nitrogen at 450 °C for 3 h to prepared the Titanium Oxide Nitrogen annealed nanoparticles (TiO NPs-N) powder as catalytic support. Using a photodeposition process, gold was added with isopropanol as a sacrificial donor and H[AuCl] acid, producing gold nanoparticles on nitrogen-annealed titanium oxide nanoparticles (Au-NPs on TiO-NPs-N). The mass loading of Au NPs was 2.86 × 10 (g/cm). TEM images of Au NPs on TiO-NPs-N suggest circular particles with a tendency to agglomerate. Cyclic voltammetry (CV) was used to investigate the electrocatalytic performance of the Au NPs/TiO-NPs-N catalysts in ferrocyanide, KOH, and HSO, and the results were compared to those of a polycrystalline Au electrode that is readily accessible in the market. In KOH, HSO, and (2 M KOH + 0.1 M glycerol) solutions, the Au NPs/TiO-NPs-N electrode displayed a startlingly high electrocatalytic performance. Using CV, the electrocatalytic oxygen reduction reaction (ORR) of Au NPs/TiO-NPs-N and Au-NPs against glycerol oxidation in basic media was studied. The results indicated that Au NPs/TiO-NPs-N is a promising support material for improving the electrocatalytic activity for acidic and basic oxidation. The electrode made of Au NPs/TiO-NTs-N has steady electrocatalytic activity and may be reused repeatedly. TiO NPs and Au NPs/TiONPs-N showed satisfactory antibacterial activity against some human pathogenic bacteria using the disc diffusion method.