Hydrothermal synthesis of anatase flower‐like nanostructures for photocatalytic degradation of dye

Abstract

Flower-like hierarchical nanostructures of titanium dioxide (TiO 2 ) have been synthesized in large scale by a facile and controlled hydrothermal and after annealing process. The morphologies of flower-like hierarchical nanostructures are formed by self-organization of several tens of radially distributed thin flakes with a thickness of several nanometers holding a larger surface area. The materials are characterized by Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The ultraviolet photocatalytic degradation of R6G dyes has been studied over this flower-like hierarchical nanostructures and the activity is compared with that of commercial P25 TiO 2 under same conditions.

Facile and effective synthesis of hierarchical TiO2 spheres for efficient dye-sensitized solar cells

“…3b shows Raman spectra of the annealed TiO 2 spheres, exhibiting an evident identication of the anatase phase from the characteristic Raman modes at 143.8 cm À1 (E g ), 196.3 cm À1 (E g ), 398.4 cm À1 (B 1g ), 515.8 cm À1 (A 1g ), and 639.4 cm À1 (E g ), assigned to the Raman active modes (A 1g + B 1g + 3E g ) of anatase, respectively, which is as well in agreement with the analysis from TEM and XRD measurements. 40 Importantly, the mesoporous nature of hierarchical TiO 2 spheres can be analyzed with N 2 adsorption-desorption isotherm measurements while the corresponding pore size distribution can be determined by using the Barrett-Joyner-Halenda (BJH) method from the desorption branch of the isotherm. As observed in Fig.…”

Preparation of titanate nanoflower for sorption of 75Se(IV) radioisotope from aqueous solution: Equilibrium, kinetic and thermodynamic studies

“…solar cells, catalyst supports, photocatalysis, sensors, novel adsorbents and Li-ion batteries [12][13][14][15][16][17][18]. In addition, TNF can efficiently adsorb inorganic and organic pollutants, such as heavy metal ions and dyes, from wastewater.…”

“…The various applications of TNF are due to their unique physicochemical properties, large surface area and pore volume, high crystallinity and good structural stability. Different methods can be used for the preparation of TNF such as oxidation processes [13], the reduction of metal salts [14], hydrothermal [15] or electrochemical [16] methods. Up to now, there are few studies about the adsorption behavior of TNF for radionuclides removal from the contaminated wastewater.…”