TiO2-mediated photoelectrochemical decoloration of methylene blue in the presence of peroxodisulfate

Abstract

Nanosized TiO 2 films on stainless steel were prepared by electrophoretic deposition and characterized by X-ray diffraction analysis and photo-voltammetry. The decoloration of methylene blue (MB) dye was used as a test reaction for the evaluation of photoelectrocatalytic activity of the prepared TiO 2 coatings. The influence of applied potential and potassium peroxodisulfate on the rate of MB decoloration was investigated. The possible mechanisms of MB oxidation under various experimental conditions are discussed.

Electrophoretic deposition: From traditional ceramics to nanotechnology

“…The deposition of nanostructured titania films by EPD has been carried out by several groups. [135][136][137][138][139][140][141] For example Dittrich et al 135,136 produced TiO 2 coatings with different porosity, systematically changed by pressing, in order to optimize the electron diffusion. These coatings present potential applications in many fields, such as batteries, displays, photocatalysis and solar energy conversion systems.…”

Electrophoretic deposition of nanoscale TiO2: technology and applications

“…In related investigations, the same authors employed TiO 2 EPD coatings for photocatalytic degradation of oxalate [128] or formic acid [130]. Valatka and Kulesius [132] determined, by the decoloration of methylene blue dye, that the higher photocatalytic activity of titania P25 coatings on stainless steel AISI 304 prepared by EPD at 30 V, was obtained when the coatings were annealed at 400 • C and the mass present was 0.5 g/cm 2 . Paoli et al [133] obtained a good level of formic acid removal and mineralization (close to 80% for 200 min) using coatings obtained by a two step EPD process.…”

Photoactive WO3 and Se-WO3 thin films for photoelectrochemical oxidation of organic compounds

“…The lamp emits mainly in the 315-400 nm range, the peak wavelength k max being at 366 nm. The average power density at 366 nm was determined to be 1.8 mW cm -2 [27].…”