4 documents found, page 1 of 1
Synthesis of ZnO mesoporous powders and their application in dye photodegradation
Maltanava, Hanna; Poznyak, Sergey; Ovodok, Evgeni; Ivanovskaya, Maria; Maia, Frederico; Kudlash, Alexander; Scharnagl, Nico; Tedim, JoãoMesoporous ZnO materials have been synthesized through chemical deposition of different precursors from aqueous or water-ethanol solutions followed by their thermal decomposition at 400°C in air. The microstructure and morphology of the precursors and obtained ZnO powders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and nitrogen...
Sol-gel template synthesis of mesoporous carbon-doped TiO2 with photocatalytic ...
Ovodok, Evgeni; Maltanava, Hanna; Poznyak, Sergey; Ivanovskaya, Maria; Kudlash, Alexander; Scharnagl, Nico; Tedim, JoãoMesoporous TiO2 powders with an anatase framework were synthesized through surfactant-assisted template method. The concentrated titania sol (7-8 wt.%) prepared from TiCl4 as a precursor was used in this synthesis. The soluble triblock copolymer Pluronic F127 was employed as a structure-directing agent and a carbon precursor to fabricate the carbon-doped mesoporous titania. The synthesized powders were characte...
Synthesis and characterization of efficient TiO2 mesoporous photocatalysts
Ovodok, Evgeni; Maltanava, Hanna; Poznyak, Sergey; Ivanovskaya, Maria; Kudlash, Alexander; Scharnagl, Nico; Tedim, JoãoMesoporous TiO2 powder with large surface area and high porosity was prepared via template-free method of heat-stimulated oxidizing destruction of TiC by HNO3. Anatase crystalline phase of as-prepared and annealed at 200−400 °C titania was confirmed by XRD technique. Surface nitrate-nitro groups responsible for high adsorption capacity of the TiO2 powders were studied by FTIR spectroscopy. The annealing tempera...
Synthesis of ZnO mesoporous powders and their application in dye photodegradation
Maltanava, Hanna; Poznyak, Sergey; Ovodok, Evgeni; Ivanovskaya, Maria; Maia, Frederico; Kudlash, Alexander; Scharnagl, Nico; Tedim, JoãoZnO materials have attracted considerable interest due to their large - scale potential applications for photodiodes, photocatalysis, sensing and others. For photocatalytical application, ZnO is usually prepared with a mesoporous structure, providing a large surface area for enhancing the system performance. Nowadays, various methods have been explored to prepare ZnO porous powders and films. Among them , the m...