Fabrication and Photocatalysis of TiO2 Flower-like Nanostructures

Abstract

TiO2 nanostructures were fabricated by a reaction of Ti foils in H2O2 solution at mild temperature. Porous TiO2 nanostructures, well-adhered to Ti foil surfaces, were formed at 80C in 10 min, and then flower- like and rod nanostructures formed in succession after a longer reaction time. Samples prepared at 80C for 4 h are amorphous, and anatase-dominated crystal phase emerged in the sample prepared for as long as 10 h. Almost pure anatase phase were obtained in TiO2 nanostructures by annealing the samples at a temperature of 300C. Photocatalysis of the TiO2 nanostructures was characterized by the degradation of RhB dye molecules in an aqueous solution exposed to ultraviolet light. Results show a 7 cm2 annealed TiO2 flower-like nanostructure having the degradation rate of RhB as fast as 29.8 times that of the dye solution exposed to ultraviolet light alone.

Characterization of Chemically Modified TiO2 Synthesized via Sustainable Superoxidation of Ti

“…For example, an interesting synthetic approach involves the superoxidation of Ti foil with H 2 O 2 , as nonhazardous chemical. 15,16,18,19 Among the different procedures reported, rigorous studies on the different reaction conditions are scarce. 18,20 For example, an existing synthetic protocol reported a treatment of Ti foil at 80 °C for 72 h with H 2 O 2 .…”

“…15,16,18,19 Among the different procedures reported, rigorous studies on the different reaction conditions are scarce. 18,20 For example, an existing synthetic protocol reported a treatment of Ti foil at 80 °C for 72 h with H 2 O 2 . 15,16 However, optimization of the reaction conditions, such as careful variation of the temperature and length of the reaction, are needed.…”

“…There exists an opportunity to develop novel sustainable routes for the synthesis of chemically modified TiO 2 with enhanced absorption in the visible range and improved electrical conductivity. For example, an interesting synthetic approach involves the superoxidation of Ti foil with H 2 O 2 , as non-hazardous chemical. ,,, Among the different procedures reported, rigorous studies on the different reaction conditions are scarce. , For example, an existing synthetic protocol reported a treatment of Ti foil at 80 °C for 72 h with H 2 O 2 . , However, optimization of the reaction conditions, such as careful variation of the temperature and length of the reaction, are needed. In order to reduce the overall energetic costs and to limit the negative effects on the environment, the synthetic parameters need to agree with green synthesis standards, thus reducing the temperature and duration of the reaction. ,, Specifically, understanding how tuning the reaction temperature and time affects the material properties may enable the discovery of novel sustainable synthetic processes for renewable energy materials.…”

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.…”