Preparation of TiO2/WO3/C/N Composite Nanofibers by Electrospinning Using Precursors Soluble in Water and Their Photocatalytic Activity in Visible Light

Abstract

Extending the absorption range of TiO2 nanofibers to visible light is a great improvement of the photocatalytic property of TiO2. In this study, TiO2/WO3/C/N nanofibers were prepared by electrospinning using precursors soluble in water then annealing in argon. Titanium(IV) bis(ammonium lactato)dihydroxide (TiBALDH) and ammonium metatungstate (AMT) were used as the precursor for TiO2 and WO3 respectively. Different volume ratios of the precursors were added to a solution of PVP before electrospinning. The fibers were studied by XPS, SEM-EDX, TEM, FTIR, XRD, Raman spectroscopy and UV–VIS diffuse reflectance spectroscopy (DRS). The photocatalytic degradation of methylene blue by the fibers in visible light was investigated. The fibers had anatase TiO2 and monoclinic WO3. Based on UV–VIS DRS and Kubelka-Munk function the fibers could absorb visible light. Moreover, 100% TiBALDH had an indirect band gap of 2.9 eV, and the band gap decreased with increase in AMT, i.e., for 0% TiBALDH, band gap was 2.4 eV. The fibers degraded methylene blue dye in visible light, and 90% TiBALDH had the highest photocatalytic activity, i.e., it degraded 40% of the dye after 240 min.

Comprehensive investigation of the mutual effect of Ce and W species in the NH3-SCR catalyst

“…5(c)) of catalysts exhibit two peaks with the banding energy of 35.6 ± 0.1 eV and 37.7 ± 0.1 eV, which belong to W 4f 7/2 and W 4f 5/2 of W 6+ , respectively. 3,51 Compared with the binding energy of W 4f for the three catalysts, the peak positions are decrease as follows: CW-M, CW-DP, CW-C. This suggests that the neighboring chemical environment of W is influenced by the synthesized methods.…”

Synthesis and Characterization of Composite WO3 Fibers/g-C3N4 Photocatalysts for the Removal of the Insecticide Clothianidin in Aquatic Media

“…In the Raman spectrum of the WOFs ( Figure 3 a), four characteristic peaks could be clearly distinguished. The two peaks centered at 258 cm −1 and 325 cm −1 are related to the W-O-W bending vibrations of the bridging oxygen, while the peaks located at 702 cm −1 and 801 cm −1 are ascribed to the asymmetric (longer bonds) and symmetric (shorter bonds) O-W-O (W 6+ -O) stretching modes, respectively [ 65 , 86 , 87 , 88 ]. These peaks are indicative of the monoclinic crystalline phase of WOFs and are in agreement with the aforementioned XRD results [ 65 , 86 , 87 ].…”