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

Sarah Bouhadoun 1 Chantal Guillard 2 Sébastien Sorgues 3 Alexandre Hérissan 3 Christophe Colbeau-Justin 3 Frederic Dapozze 2 Aurélie Habert 1 Vincent Maurel 4 Nathalie Herlin-Boime 1, * 
* Corresponding author
1 LEDNA - Laboratoire Edifices Nanométriques
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
2 CARE - IRCELYON-Catalytic and Atmospheric Reactivity for the Environment
IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon
4 CAMPE - Conception d’Architectures Moléculaires et Processus Electroniques
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/IRIG/SYMMES
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.
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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, National Institute for Materials Science, 2017, 18, pp.805 - 815. ⟨10.1080/14686996.2017.1379858⟩. ⟨cea-01623922⟩



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