Electrochemical Synthesis of TiO₂ under Pulse Alternating Current: Effect of Thermal Treatment on the Photocatalytic Activity

Abstract

The current work aimed to study the effect of thermal treatment on the structural, optical, and photocatalytic properties of TiO2 nanoparticles synthesized by a novel large‐scale electrochemical method using pulse alternating current (PAC). The obtained titania was characterized via XRD, TEM, XPS, UV‐Vis DRS, PL, Raman and FTIR spectroscopy. The as‐prepared TiO2 was found to be poorly crystallized and partly amorphous. Following thermal annealing, the anatase structure is developed at temperatures of 400–600 °C. The photoreactivity of the TiO2 nanoparticles was evaluated for the degradation of methylene blue (MB) and rhodamin B (RhB) dyes under UVA irradiation. As shown, the adsorption properties and photocatalytic activity of the as‐prepared TiO2 strongly depend on the chemical nature of the dye. The enhanced photocatalytic performance for the MB and RhB degradation was observed for the sample annealed at 400 °C, which coincides with a balance between the degree of crystallinity, specific surface area, optical properties and efficiency of electron‐hole pair separation.

One-step synthesis of γ-Fe2O3/Fe3O4 nanocomposite for sensitive electrochemical detection of hydrogen peroxide

“…In this study, the γ -Fe 2 O 3 /Fe 3 O 4 nanocomposite was prepared via an electrochemical method using pulse alternating current (PAC). The synthesis of other metal oxide-based materials such as SnO 2 -SnO, TiO 2 , CuO x , Co 3 O 4 /CoOOH and NiO/C nanocomposite using PAC technique has already been described in our previous reports [27][28][29][30][31] . 0.05 μM, a fast response time of 2 s, good stability and selectivity.…”

Pt catalysts prepared via top-down electrochemical approach: synthesis methodology and support effects

“…In the case of hybrid supports, carbon black was added to the alkali solution together with SnO 2 or TiO 2 materials. These materials were prepared using the methods described previously [13,14]. The catalytic material contained 10-60% of SnO 2 and TiO 2 .…”