Synthesis and antibacterial activity of novel titanium dioxide doped with silver

Abstract

Pure and silver doped nanoparticles of titanium dioxide (TiO 2) was prepared using novel, modified sol-gel method. The samples were characterized by transmission electron microscopy, X-ray diffraction, N 2 adsorption measurement, atomic absorption spectroscopy (AAS), UVvis spectroscopy (UV-vis). The antibacterial activity of the prepared samples was indicated by minimal inhibitory concentrations (MIC) and minimal bactericidal concentrations (MBC) values according to the reference methods of Clinical and Laboratory Standards Institute for the determination of MIC of aerobic bacteria by broth microdilution. The results showed very good antibacterial activity of silver nanoforms to bacteria strains: Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli and Klebsiella pneumoniae. The sensitivity of the tested bacteria to silver nanoforms depends on the crystalline form of the carrier-TiO 2 , its surface area, porosity, the content of silver, its particle size and oxidation state. The originality of this work is the synthesis of novel type of nanocomposites TiO 2 doped with silver and determination its excellent antibacterial activity.

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

“…Owing to the highly oxidative nature of these species, also the cell walls and membranes of microorganisms can be destroyed, thus inducing a truly antimicrobial effect (Fig. 70) [423,429,[444][445][446][447].…”

Antimicrobial Double-Layer Coating Prepared from Pure or Doped-Titanium Dioxide and Binders

“…Titanium dioxide (TiO 2 ) has a strong killing effect on all kinds of bacteria under UV irradiation, while metal (Cu, Co, Ni, Cr, Mn, Mo, Nb, V, Fe, Ru, Au, Ag, Pt)-doped-TiO 2 and nonmetal (N, S, C, B, P, I, F)-doped-TiO 2 exhibits high antibacterial activity, even under visible light [9][10][11][12][13][14]. Due to their chemical stability, non-toxicity, and capacity to be repeatedly used without losing activity, these inorganic compounds have demonstrated usefulness as disinfection or sterilization reagents for water and air purification, self-clean solid surfaces, and food protection.…”

Green and Rapid Synthesis of Copper-Doped TiO2 Nanoparticles with Increased Photocatalytic Activity

“…It is found that the phytochemical present in fruit peels 20 are responsible for synthesis of Cu-doped nanoparticles that itself acts as stabilizers in synthesis 15 thus special capping agent/ stabilizer is not required. As plant extract is used instead of organic chemicals, this method omits the use of conventional chemicals like isopropyl alcohol 21 , ethanol 22 , polyvinyl alcohol 23 , etc. On the other hand, plant extract is prepared in water with waste peels.…”