Heterostructured TiO2/WO3 porous microspheres: Preparation, characterization and photocatalytic properties

Photocatalytic degradation of 4-chloro-2-methylphenoxyacetic acid using W-doped TiO2

“…WO3 has low band gap energy of ≈ 2.8 eV and could also function as electron sink through a type II hererojunction when loaded on TiO2. This invariably improves the photocatalytic performance of TiO2 [17,18].…”

WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties

“…Slight decrease of photocatalytic activity of TW300 sample in a case of R6G photodegaradation (Fig. 7a) can be explained by the occurrence of photochromism [27,40]. Namely, the electron accumulation at the WO 3 conduction band can be more pronounced with increased WO 3 content.…”

“…Namely, the electron accumulation at the WO 3 conduction band can be more pronounced with increased WO 3 content. The accumulated electrons can react with OH radicals forming OH À ions or can reduce the number of superoxide radicals [27,40] degrading at some extent the photocatalytic activity of WO 3 /TiO 2 coatings. The presence of pronounced absorption feature around 380-400 nm in the absorbance spectrum of TW300 sample confirms this assumption.…”

“…Additionally, the formation of WO 3 monolayer on TiO 2 increases the acidity of the WO 3 /TiO 2 surface enabling the adsorption of greater amount of hydroxyl groups and organic reactants on the surface [21,22]. In recent years, WO 3 /TiO 2 composites were synthesized using different methods such as sol-gel, ultrasonic spray pyrolysis, ball milling, hydrothermal, sol-precipitation, and impregnation to improve photocatalytic activity of TiO 2 under the visible light [23][24][25][26][27][28]. Thin films of TiO 2 / WO 3 have also been prepared by dip and spin coating [29,30] or by one-step oxidation method [31].…”

Promotion of multi-electron transfer for enhanced photocatalysis: A review focused on oxygen reduction reaction

“…To address this issue, we [77] have prepared heterostructured micropheres. To understand the mechanism for activity enhancement over TW-2 sample, we performed a photochromism experiment.…”