Formulation, characterization and applications of titanium dioxide, polyoxometalates and silver nanocomposites

H. Kumar Daima
Amity University Rajasthan,
India

Keywords: formulation, titanium dioxide, polyoxometalates, silver nanocomposites, dye degradation, antibacterial

Summary:

In the recent past, Titanium dioxide (TiO2), polyoxometalates (POMs) and silver (Ag) based nanomaterials have been employed for various biological and industrial applications. TiO2 possesses excellent photocatalytic activity; POMs are keggin ions with exceptional biomedical potentials; and Ag is best known for its antimicrobial behaviour since antiquity. Therefore, in present work, we hypothesise that combination of all these three materials in a single system at nanoscale level may provide better prospects towards industrial and biological contaminants. First synthesis of AgNPs using tyrosine amino acid was carried out, wherein tyrosine works as a reducing agent because of its phenolic group [3]. Parallel to this, composites of TiO2 and phosphotungstic acid/PTA or phosphomolybdic acid/PMA (TiO2-PTA, TiO2-PMA, TiO2-NH2-PTA and TiO2-NH2-PMA) were prepared followed by their functionalization with tyrosine reduced AgNPs to obtain TiO2-Ag, TiO2-POM-Ag, TiO2-NH2-Ag and TiO2-NH2-POM-Ag as depicted in Figure 1. Further, all these materials were characterized using UV-vis, TEM, DLS and Zeta potential analyser. After in-depth physicochemical characterization, all these materials were subjected to Congo red dye degradation studies and antibacterial performances of fabricated nanocomposites were evaluated against Pseudomonas aeruginosa and Escherichia coli, which has shown significant impact on dye degradation and antibacterial potentials.