A simple and efficient ultrasonic-assisted electrochemical approach for scalable production of nitrogen-doped TiO₂ nanocrystals

Abstract

In this study, we report a facile and effective approach for large-scale production of nitrogendoped TiO 2 nanocrystals (UNTs) by a combination of ultrasonic irradiation and electrochemistry at room temperature using NH 4 NO 3 electrolyte as the nitrogen source. The as-prepared UNTs were then characterized by x-ray diffraction, Raman spectroscopy, x-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and UV-visible diffuse reflectance spectroscopy. The results indicated that the nitrogen content of UNTs reached 9.3% and bandgap energy of 2.62 eV, thus gave the high photocatalytic degradation of methylene blue under visible light irradiation. The mechanism for the formation of UNTs by ultrasonic-assisted electrochemical approach was also proposed.

Treatment of textile dye wastewater by peroxymonosulfate activation using facilely prepared Fe3O4@TiO2 heterogeneous photocatalyst

“…The effect of operating factors on the treatment performance of the system was investigated using different material dosages (0.1-1 g L -1 ), PMS concentration (0.1-1 g L -1 ), RhB concentration (50-100 mg L -1 ), solution pH (3)(4)(5)(6)(7)(8)(9)(10)(11), and the presence and concentration of anions (Cl − , SO 4 2− , CO 3 2− , and PO 4 3− at concentrations of 5 and 20 mM).…”

“…Therefore, several methods have been applied to improve the performance of TiO 2 for dye treatment in water, including doping with metals and nonmetals, surface modification with metals and metal oxides, and combination with other materials to form composite materials. [8,9] These methods could reduce the bandgap of the materials for utilizing visible or solar light, enhance the charge separation for increasing the quantum efficiency, and provide the magnetic property for easy recovery and reuse of the materials.…”

A Review on Oxygen-deficient Titanium Oxide for Photocatalytic Hydrogen Production

“…Ultrasonic spray pyrolysis is a simple, low-cost, and scalable technique [54,[109][110][111][112]. In the literature, Nakaruk et al [110] successfully prepared fully dense TiO 2 films with oxygen deficiencies by using ultrasonic spray pyrolysis and proved that the concentration of oxygen deficiencies could be controlled by changing the annealing temperature.…”

Interfacial synthesis of polyaniline–polypyrrole on electrospun vanadium oxide-embedded TiO2 nanofibers with enhanced photocatalytic performance

“…5,6 In recent years, there has been considerable interest in the photocatalytic activation of PMS with the most-studied photocatalyst being TiO 2 due to its outstanding properties such as high chemical stability and environmental friendliness. 12–15 However, the wide bandgap energy (3.0–3.2 eV) and fast photogenerated electron–hole recombination of TiO 2 limit its use in the ultraviolet (UV) region ( λ ≤ 388 nm) and lessen its efficacy in practical applications. 16–18…”

“…5,6 In recent years, there has been considerable interest in the photocatalytic activation of PMS with the most-studied photocatalyst being TiO 2 due to its outstanding properties such as high chemical stability and environmental friendliness. [12][13][14][15] However, the wide bandgap energy (3.0-3.2 eV) and fast photogenerated electron-hole recombination of TiO 2 limit its use in the ultraviolet (UV) region (l r 388 nm) and lessen its efficacy in practical applications. [16][17][18] In order to extend the working regime of TiO 2 to the visible (Vis) region to efficiently utilize solar energy, and increase its photocatalytic efficiency, a promising strategy is to combine TiO 2 with other photocatalysts with smaller bandgaps [19][20][21][22][23][24] such as V 2 O 5 (B2.2 eV).…”