Preparation of highly porous TiO₂nanotubes and their catalytic applications

Abstract

A simple procedure for preparing highly porous TiO 2 nanotubes is reported. The nanotubes were prepared in the form of a nonwoven mat by emulsion electrospinning a solution containing poly(vinyl pyrrolidone), titanium tetraisopropoxide and oil, followed by calcination in air at 500 C. The mixed crystalline material comprised anatase and rutile TiO 2 particles, whose diameters were about 11 nm and 21 nm, respectively. The highly porous TiO 2 nanotube membranes, which had large specific surface areas and excellent ratios of anatase phase to rutile phase, were shown to have excellent catalytic activities. Also the mixture of crystal forms improved the efficiency of photocatalysis because at the mixed interface electrons and holes are separated effectively. The new method for producing highly porous TiO 2 nanotubes is versatile and could be extended to the fabrication of various types of highly porous nanotubes.

Photocatalytic Degradation and Hydrogen Production of TiO2/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

“…After loading TiO 2 nanoparticles, the roughness of the fibers is further increased, which is beneficial to the absorption of RhB molecules. As seen from Figure 2(a), TiO 2 nanoparticles are made of anatase and rutile phases with 80 : 20 ratio, which formed the heterojunctions (the schematic diagram in Figure 7(d)) [23]. Under the UV light irradiation, the electrons are excited from the valance band (E v ) into the conduction band (E c ) in TiO 2 , leaving the holes in the valance band.…”

Improved coercivity and considerable saturation magnetization of cobalt ferrite (CoFe2O4) nanoribbons synthesized by electrospinning

“…Then a spinning jet with a circular cross section is ejected from the droplet. Earlier works have indicated that the solvents evaporate rapidly from the jet surface [25][26][27]. Thereupon, the PVP concentration of jet surface sol increases sharply.…”

Facile preparation of mesoporous TiO2(B) nanowires with well-dispersed Fe2O3 nanoparticles and their photochemical catalytic behavior

“…First, the porous structure of TiO 2 (B) support could improve the light utilization efficiency, as some of the photons entered the porous structure and were absorbed by the TiO 2 and Fe 2 O 3 NPs [41,42]. At the same time, the well-matched phase interfaces of heterostructure of TiO 2 (B) and Fe 2 O 3 NPs promoted the separation of photo-induced electrons and holes and suppressed charge recombination.…”