Synthesis and characterization of ZnO and TiO2 hollow spheres with enhanced photoreactivity

Direct electron transfer and electrochemical study of hemoglobin immobilized in ZnO hollow spheres

“…ZHS was synthesized using the sulfonated polystyrene (PS) core-shell spheres as the template spheres. The method of synthesis of the sulfonated PS spheres was described elsewhere [19]. Zn(Ac) 2 Á2H 2 O was dissolved in absolute ethanol, the sulfonated PS spheres ethanol solution was added dropwise to it under magnetic stirring.…”

“…The mixed solution was stirred at 60°C for 1 h, and then ethanol solution containing NaOH was dropped into the mixture and stirred at 60°C for another 2 h. The solution was then filtered and the cake was washed with ethanol and water. ZHSs were obtained after the cake was heated in air at 500°C for 2 h to remove the PS templates [19][20][21].…”

Photocatalytic Properties of Nb/MCM-41 Molecular Sieves: Effect of the Synthesis Conditions

“…The benefits of these mesoporous structures are illustrated by the titania nanophotocatalysts in the photocatalytic oxidation of dyes [10], oxidative disruption of the cell membranes of E. coli bacteria [11] and carbon dioxide reduction to methanol [12], among others. Specifically, mesoporous ZnO [13], CeO2 [14] and Co3O4 [15] have all exhibited high photocatalytic activity in the destruction of dyes when compared with non-porous nanopowders.…”

Photo-Degradation of Methelyne Blue over V2O5–TiO2 Nano-Porous Layers Synthesized by Micro Arc Oxidation

“…Although it has a lot of advantages including biological and chemical inertness, strong oxidizing power, cost-effectiveness, and long-term stability against photo-corrosion and chemical corrosion [10][11][12][13][14][15][16][17], its wide band gap (*3.2 eV) and electron-hole recombination limit its applications. Because of its wide band gap energy, it only absorbs the UV region of the solar spectrum which is about only 4% of the incoming solar energy.…”

“…Therefore, numerous attempts have been directed to extend the absorption of TiO 2 towards the visible part of the spectrum by many researchers in the last three decades [18][19][20]. To decrease the charge recombination rate and increase the TiO 2 photo-catalytic efficiency, several methods have been put forward such as loading of metallic and non-metallic species [21,22] inorganic ions [23,24], noble and rare metals [25,26] into the crystalline lattice of titania, or mixing titania with other semiconductor metal oxides [17,[27][28][29][30]. Such modifications can change TiO 2 surface properties by altering interfacial electron transfer process and, consequently, improve the photo-catalytic efficiency of the surface as compared with pure TiO 2 .…”