Porous V2O5/TiO2 Nanoheterostructure Films with Enhanced Visible-Light Photocatalytic Performance Prepared by the Sparking Method

Abstract

Porous V2O5/TiO2 nanoheterostructure films with different atomic ratios of Ti/V (4:1, 2:1, 1:1, and 1:2) were synthesized by a sparking method for the first time. The sparking method, which is a simple and cost-effective process, can synthesize highly porous and composite films in one step. Field-emission scanning electron microscope (FE-SEM) images revealed the porosity morphology of all prepared samples. V2O5/TiO2 nanoheterostructure films were confirmed by Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The secondary particle size and band gap of the samples were highly correlated to the V2O5 proportion, resulting in enhanced visible-light absorbance. V2O5/TiO2 nanoheterostructure films at an atomic ratio of 1:1 showed the highest photocatalytic performance, which improved the degradation rate up to 24% compared to pure TiO2 film. It is believed that the formed nanoheterostructure and greater portion of V4+ ions are reflected by this ratio.

Effect of magnetic field on improvement of photocatalytic performance of V2O5/TiO2 nanoheterostructure films prepared by sparking method

“…The nanoparticle was sparking off the wire with difference quantities by a breakdown voltage of ~ 3 kV that was discharged from 24 nF capacitor. These conditions were fixed throughout this work to synthesize porous V 2 O 5 /TiO 2 nanocomposite films with a V/Ti atomic ratio of approximately 1:1, which was also the optimized condition for improving photocatalytic performance reported in previous paper 12 .…”

“…In the literature review, we found that heterostructures of TiO 2 and other oxides, such as Cu 2 O, WO 3 , V 2 O 5 , ZnO, SiO 2 , MoS 2 , Fe 3 O 4 and SnO 2 7 – 11 to form the semiconductor coupling are believed to overcome the facile recombination of e − /h + pairs, which is a promising method to optimize photocatalytic performance and visible-light utilization. In our previous work, porous vanadium pentoxide/titanium dioxide (V 2 O 5 /TiO 2 ) nanoheterostructure films with various atomic ratios of Ti/V (4:1, 2:1, 1:1, and 1:2) were successfully fabricated by the sparking method which can synthesize highly porous and composite films in one simple step 12 . However, post-annealed process was required for films crystallization, oxidation, and strong interaction between nanoparticles that limits the application for large-scale manufacturing with simplicity and cost-effectiveness.…”

A Novel α‑Fe2O3/TiO2 heterostructured nanocomposite with Enhanced Visible-light Photocatalytic Performance for Degradation of Organic Pollutant

“…Among various semiconductor photocatalysts (PCs), the well-known Titania (TiO 2 ) has attracted extensive courtesy owed to their preponderant potential features such as low-cost, non-toxicity, high photo-stability, ne electronic assets, great photochemical corrosive resistance, strong oxidizing power and photocatalytic movement [6][7][8]. This is based on the absorption of a photon of appropriate energy (~ 3.2 eV) and the creation of charge carriers (photo-electrons (e − ) and photo-holes (h + )) that could oxidize organic pollutants into CO 2 and H 2 O.…”

“…Among them, semiconductors (SCs) heterogeneous photocatalytic AOPs decomposition has been expected to be effective strategies for used by many researchers since of its high degradation/mineralization e ciency to remove organic pollutants from wastewater due to the reactive − OH•, also low toxicity, low-cost, and ability to function under ambient settings [5]. Among various semiconductor photocatalysts (PCs), the well-known Titania (TiO 2 ) has attracted extensive courtesy owed to their preponderant potential features such as low-cost, non-toxicity, high photo-stability, ne electronic assets, great photochemical corrosive resistance, strong oxidizing power and photocatalytic movement [6][7][8]. This is based on the absorption of a photon of appropriate energy (~ 3.2 eV) and the creation of charge carriers (photo-electrons (e − ) and photo-holes (h + )) that could oxidize organic pollutants into CO 2 and H 2 O.…”

Catalysis by Hybrid Nanomaterials

“…Inorganic and mixed organic-inorganic hybrid nanomaterials are perspective for photocatalytic reactions [ 9 ]. Porous V 2 O 5 /TiO 2 nanoheterostructure films with atomic Ti/V ratios ranging from 4:1 to 1:2 were prepared using a sparking method and demonstrated enhanced visible-light absorbance resulting in high photocatalytic activity in degradation of methylene blue in water.…”