Authors: Johannes Melcher Shaik Feroz Detlef Bahnemann
Publish Date: 2017/02/06
Volume: 52, Issue: 11, Pages: 6341-6348
Abstract
Transition metal doping is an appropriate way to increase the photocatalytic activity of TiO2 as it offers the chance to also utilize visible light to generate charge carriers Here we investigated the photocatalytic activity of commercially available Evonik Aeroxide® TiO2 P25 and its irondoped analog Evonik Aeroxide® TiO2 PF2 For this study we used as model reaction the photocatalytic oxidation of methanol CH3OH to formaldehyde HCHO employing artificial solar illumination with and without UVlight Apparently the iron content in PF2 is too high and therefore has a negative effect on its photocatalytic activity Furthermore by the comparison of photonic efficiencies ξ and quantum efficiencies Φ we could show the importance of not just calculating photonic efficiencies but also shed some light on the mechanism how the charge carriers in P25 are generatedThe authors thank the workgroup of Dr Bigall for using their photospectrometer and the “European Regional Development Fund” for supporting the programme “Europa fördert Niedersachsen” especially the Project Nanokomp—Nanostrukturierte Kompositmaterialien—von der Entwicklung in die Produktion WA380125215
Keywords: