Oxygen-Deficient WO3/TiO2/CC Nanorod Arrays for Visible-Light Photocatalytic Degradation of Methylene Blue

Abstract

At present, TiO2 is one of the most widely used photocatalytic materials. However, the narrow response range to light limits the photocatalytic performance. Herein, we reported a successful construction of self-doped R-WO3/R-TiO2/CC nanocomposites on flexible carbon cloth (CC) via electrochemical reduction to increase the oxygen vacancies (Ovs), resulting in an enhanced separation efficiency of photo-induced charge carriers. The photocurrent of R-WO3/R-TiO2/CC at −1.6 V (vs. SCE) was 2.6 times higher than that of WO3/TiO2/CC, which suggested that Ovs could improve the response to sunlight. Moreover, the photocatalytic activity of R-WO3/TiO2/CC was explored using methylene blue (MB). The degradation rate of MB could reach 68%, which was 1.3 times and 3.8 times higher than that of WO3/TiO2/CC and TiO2/CC, respectively. Furthermore, the solution resistance and charge transfer resistance of R-WO3/R-TiO2/CC were obviously decreased. Therefore, the electrochemical reduction of nanomaterials enabled a promoted separation of photogenerated electron–hole pairs, leading to high photocatalytic activity.

Yolk@Wrinkled-double shell smart nanoreactors: new platforms for mineralization of pharmaceutical wastewater

“…Electron charge transfer is affected by the position of the conduction band (CB) and the valence band (VB) determined for the photocatalysts Fe 3 O 4 , ZrO 2 , and TiO 2 according to Eq’s (20) and (21) ( Ojha et al, 2019 ): where in the above relations , and represent the conductivity potential, the capacitance potential and the energy band gap, is constant for all photocatalysts and represents the energy of free electrons, moreover X is the absolute electronegativity and for Fe 3 O 4 , ZrO 2 and TiO 2 the sequence has values of 5.73, 5.91 and 5.81, respectively ( Bi et al, 2020b ; Jiang et al, 2021 ; Pham et al, 2021 ). of each photocatalyst was also determined by UV-vis DRS analysis.…”

Synthesis and characterization of nonmetal-doped TiO 2 nanoparticles for mineralization of rhodamine B dye

“…Theoretical calculations based on Mulliken electronegativity theory have been employed to determine the energy levels of the valence band (VB) and conduction band (CB) of both pure TiO 2 and doped TiO 2 nanomaterials [17]:…”

“…Speci cally, the VB potential (E VB ), electron energy (E e = 4.5 eV), CB potential (E CB ), band gap width (E g ), and the absolute electronegativity of TiO 2 (X) were used to estimate the energies of the bands. According to previous research, the absolute electronegativity of TiO 2 has been reported to be 5.81 eV [17]. By utilizing these values, along with the formulas provided, the VB and CB energies for pure TiO 2 and doped-TiO 2 nanomaterials were computed and compiled in Table 1.…”

Photodegradation of Methylene Blue and Crystal Violet by Zr-Modified Engelhard Titanium Silicate 10

“…Zeolite-type porous materials, combining adsorption and photocatalysis, offer a promising solution [10]. These materials, characterized by a developed surface and good thermal stability, can undergo ion exchange, allowing for changes in their chemical composition and physicochemical properties [10,11]. Titanium Silicate 10 (ETS-10) has shown promising photocatalytic applications in various fields.…”