Abstract
Porous nanocomposites of Au/Ag-TiO2 aerogels benefit from unique morphological characteristics of aerogels, intrinsic physical, chemical and also photocatalytic required properties of TiO2 and strong plasmonic effects of metal nanoparticles, i.e., Au and Ag. Therefore, they are able to be applied as an ideal photocatalyst overcoming the intrinsic weak points of conventional TiO2. In this research, several composites of TiO2 aerogel modified with Au, Ag and mixture of Au-Ag nanoparticles were prepared by applying two different methods of synthesis. The photocatalytic efficiency of the samples was established by using salicylic acid (SA) as a standard pollutant molecule. The photodegradation rate of SA under irradiation was investigated by the decrease in its concentration in time, and found to depend on specific surface area and type of metal nanoparticles trapped into the TiO2 network. The larger surface area and the presence of the two metal nanoparticles lead to the best results. Furthermore, the morphological characterizations and physical properties of the nanocomposites were investigated through BET results, FESEM and TEM images.
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