Preparation of Ultrafine TiO₂ Nanofibers and their Application in Removal of NO_x in Air

Abstract

Titanium dioxide nanofibers were fabricated by electrospinning technique. The titania solutions were obtained from adding various types of Ti precursor (Ti(OBu)4, Ti(OiPr)4, and Ti(OPr)4) to an ethanol solution containing polyvinyl pyrrolidone (PVP). Acetic acid was used to stabilize the solution and to control the hydrolysis reaction. The porous and well-defined crystalline structure was obtained after calcined at 450oC for 1 h. The thermal behavior, phase composition including crystallite size, as well as the morphology of as-synthesized nanofibers was obtained from thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The average diameter of these nanofibers was in the range from 100 to 400 nm depending on titania precursor. The photocatalytic activity of TiO2 fibers were evaluated for NOx degradation in a gaseous phase. The results demonstrated that at the same catalyst loading, the photocatalytic activity of TiO2 nanofiber was higher than the commercial Degussa P-25.

One-Dimensional Titanium Dioxide Nanomaterials: Nanowires, Nanorods, and Nanobelts

“…Many Ti-based compounds (either inorganic or organic) can be used as the precursor as long as it is dissolvable and does not leave undesired residues after annealing. Typical precursors include TiP, Ti­(OBu) 4 , Ti­(OiPr) 4 , and Ti­(OPr) 4 . ,, A binder refers to a polymer component that holds TiO 2 fine powders together in a fiber shape after spinning. It can serve as the solvent as well and usually is burned off during the final annealing process.…”

“…For example, Onozuka et al dissolved TiP and acetic acid into polyvinyl acetate (PVac) to form a transparent precursor solution and obtained PVac/titania composite fibers by electrospinning . Many researchers used different solvent and binder materials, e.g., ethanol as the solvent and polyvinyl pyrrolidone (PVP) as the binder, for fabricating TiO 2 nanofibers. ,, Less binder material and volatile solvent allowed the organic components to be completely removed during sintering and pure polycrystalline TiO 2 nanofibers were obtained. The size of TiO 2 nanofibers usually is determined by the size of the spin orifice.…”

Effects of Electrospinning Solution Properties on Formation of Beads in Tio2 Fibers with PdO Particles

“…These properties enhance the performance of fibers in multifunctional fiber media in filtration, biomedical applications, catalyst supports, fuel cell membranes, sensor technologies, semiconductors and composite materials [1][2][3][4][5][6][7][8][9][10][11]. Electrospinning is a popular and versatile technique to fabricate nonwoven fiber mats of fibers with diameters in nanometer to micron ranges [12][13][14][15][16].…”

Carbon Nanofibers Containing Ag/TiO<sub>2</sub> Composites as a Preliminary Stage for CDI Technology

“…The Ag/PAN nanocomposite film was characterized by XRD, TEM and UV absorption spectrophotometer. N. Pimpha et al [11] reported that Titanium dioxide nanofibers were fabricated by electrospinning technique. The titania solutions were obtained from adding various types of Ti precursor (Ti (OBu) 4 , Ti (O i Pr) 4 , and Ti(OPr) 4 to an ethanol solution containing polyvinyl pyrrolidone (PVP).…”