Antimicrobial application of Silver Nanoparticles Supported on Ti1-xCexO2: Synthesis and Morphological Characterization (Published)
Water pollution affects ecosystems including humans, water reserves for human consumption are increasingly scarce and disinfection methods are expensive and ineffective. In this work, a material based on TiO2 was synthesized using the sol-gel method, and then doped with CeO2; Silver was added to the synthesized material by the incipient moisture method, to provide the bactericidal effect against Salmonella Typhimurium strains. The experimental results show the presence of crystalline phases of TiO2-Ce and deposits of Ag. The combination of Ti, Ce, and Ag in the Ag/Ti0.96Ce0.04O2, worked as a bactericidal material for Salmonella Typhimurium; the silver content of 4% (w/w) was sufficient to inhibit bacteria. This could be because cerium and titanium break down the cell membrane, which makes silver easily interact with the nucleus of bacteria.The textural results show the diameter of the pores in all samples ranges from 2 to 50 nm (mesoporous solid). On the other hand, the rough morphology of the nanoparticles could enhance the antibacterial efficacy because it contributes to the rupture of the membranes of the aforementioned bacteria.
Citation: América A. M. H., Roberto G. G., Ramiro E. G., José LR. (2022) Antimicrobial application of Silver Nanoparticles Supported on Ti1-xCexO2: Synthesis and Morphological Characterization, International Journal of Biochemistry, Bioinformatics and Biotechnology Studies, Vol.7, No.2, pp.21-30
Keywords: Anatase, Photoactivity, Photocatalysis, Salmonella Typhimurium, Silver Nanoparticles, Sol- Gel method, Synthesis, Water pollution
Adsorption Isotherm for the Hazard Removal Dyes. (Published)
The adsorbent mixed sulfated titania active carbon over silica STAC /SiO2 was synthesized by sol- gel method and was tested for its efficiency in removing Eosin and Saffranin dyes . The parameters studies include contact time, initial dye concentration, magnetic stirring and temperature. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plots with the temperature variation study showed that the Eosin and Saffranin adsorption was endothermic and spontaneous with increased randomness at the solid solution interface. 100% removal of saffranin dye was observed at 40 C. Thermodynamic parameters such as ∆ H° , ∆S° , ∆G° were evaluated . The positive ∆ H° value suggest that the adsorption of Eosin and Saffranin dyes on STAC/SiO2 involves physisorption mechanism. The adsorbent was found to be both effective and economically viable.
Keywords: Eosin and Saffranin dyes, STAC/SiO2 adsorbent, Sol- Gel method
