engleski

Modified metal oxide nanostructures as immobilized photo-catalysts for degradation of water pollutant

The photocatalytic degradation of water pollutant was examined using immobilized thin films of TiO2- and ZnO-based nanostructures improved by different surface modification. The strategies used for the improvement of their photocatalytic activity in UV region and broadening of their activity in visible and near IR light, will be presented. Thin films nanostructures were prepared by electrochemical or wet-chemical procedures, while the modifications or decoration of the surface were obtained by simple methods as photo- reduction, hydrothermal processing, spin coating, or wet–impregnation using various compounds as modifies (Ag, FeOOH/Fe2O3, Cu-based compound, Ba- based compounds, etc.). The structural properties of photo-catalysts were studied by X-ray powder diffraction (XRD), Raman spectroscopy, scanning and transmission electron microscopy (SEM and TEM). The photo-catalysts were studied for the use in degradation of actual pollutants in water, as industrial and pharmaceutic pollutants (1H- benzotriazole, 2, 5-dihydroxybenzoic acid, imidacloprid, salicylic acid or diclofenac). It was shown that the photocatalytic activity of TiO2- and ZnO-based nanostructures and rates of pollutant degradation were considerably increased by surface modifications. The mechanism behind the resulting improvement in photocatalytic activity will be discussed in the view of photo-catalysts nano-structure and the routes of their preparations. Therefore, an immobilized photocatalysts were designed for the flow-through reactor systems photocatalysis using simple, inexpensive and fast synthesis.

modified TiO2 ; ZnO ; immobilized photo-catalysts ; degradation of water pollutant

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