Laser synthesized TiO$_2$ -based nanoparticles and their efficiency in the photocatalytic degradation of linear carboxylic acids - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Science and Technology of Advanced Materials Year : 2017

Laser synthesized TiO$_2$ -based nanoparticles and their efficiency in the photocatalytic degradation of linear carboxylic acids

Abstract

Titanium dioxide nanoparticles were synthesized by laser pyrolysis, their surface and electronic properties were modified by gold and/or nitrogen. These materials were characterized by different techniques like X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). Time resolved conductivity (TRMC) was used to study the charge separation of electron/hole pairs. Altogether (XPS, EPR, TRMC), the physicochemical characterizations are well correlated with chemical photoactivity of the different samples. Their photocatalytic activity was evaluated for the degradation of linear carboxylic acids (C2-C3) under UV and visible illumination. The decomposition rate of acids was measured, it shows that the modification with gold increases the photoactivity while the presence of nitrogen slows down the process. Such observations are in good agreement with evolution of TRMC signals. A degradation pathway has been determined by identification of intermediate products by chromatography and EPR, results show different intermediate species. In particular EPR confirms the presence of NO$^{2−}$ paramagnetic centers and shows two novel N centered paramagnetic centers. A decrease of the degradation rate is observed with increase of carboxylic acid chain length.
Fichier principal
Vignette du fichier
2017 stam bouhadoun.pdf (1.35 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive
Loading...

Dates and versions

cea-01623922 , version 1 (25-10-2017)

Identifiers

Cite

Sarah Bouhadoun, Chantal Guillard, Sébastien Sorgues, Alexandre Hérissan, Christophe Colbeau-Justin, et al.. Laser synthesized TiO$_2$ -based nanoparticles and their efficiency in the photocatalytic degradation of linear carboxylic acids. Science and Technology of Advanced Materials, 2017, 18, pp.805 - 815. ⟨10.1080/14686996.2017.1379858⟩. ⟨cea-01623922⟩
142 View
164 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More