![]() All these applications require certain crystal structure and electronic characteristics as well as developed specific surface area and porous structure of ZrO 2. Therefore, ZrO 2 exhibits photocatalytic activity only under UV-irradiation. ![]() Its use as a photocatalyst is confined by a large band gap: 3.5–5.0 eV depending on preparation methods and calcination conditions. As this oxide can be obtained in a highly dispersed state (as non-porous and porous powders or porous xerogels), it is widely applied as the catalysts, the adsorbent or the support for catalysts. Zirconium dioxide is a versatile material. As follows from the investigations, each way of modification results in the shift of the absorption edge toward higher wavelength values and causes photocatalytic degradation of RhB under UV irradiation and makes the obtained materials effective photocatalysts in the visible region. The DTA and XRD results showed the formation of crystalline structure during MWT. ![]() In most samples, the specific surface area increase was observed. The results show that the microwave and MChT, differing in mill rotation speed, temperature or treatment media, causes significant changes in the porous structure of the obtained samples. Photocatalytic properties of the samples were also studied as regards the rhodamine B (RhB) degradation in the aqueous solution. The obtained materials were characterized using the N 2 adsorption/desorption, thermogravimetry (TG, DTG, DTA), XRD and UV–Vis/DRS methods. The effects of the microwave treatment (MWT) and mechanochemical treatment (MChT) on the structure and physicochemical properties of precipitated zirconium oxide were investigated. ![]()
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