TiO2/graphene and TiO2/graphene oxide nanocomposites for photocatalytic applications: A computer modeling and experimental study

by / Friday, 18 May 2018 / Published in

TiO2/graphene and TiO2/graphene oxide nanocomposites for photocatalytic applications: A computer modeling and experimental study


Published in: Composites Part B: Engineering, 145, 39-46
2018/07/15
Publisher URL: https://www.sciencedirect.com/science/article/pii/S1359836817340039
DOI: https://doi.org/10.1016/j.compositesb.2018.03.015 Authors:
P. M. Martins C.G. Ferreira A. R. Silva Bruno Magalhães M. M. Alves L. Pereira Paula A. A. P. Marques M. Melle-Franco Senentxu Lanceros-Mendez
Abstract:

This work reports a computational study, focused on graphene (G) and graphene oxide (GO) interfaces with titanium dioxide (TiO2), and an experimental assay on the photocatalytic activity of TiO2/G and TiO2/GO nanocomposites in the degradation of two different pollutants: methylene blue and ciprofloxacin. Both carbon nanostructures were compared due to their different chemical structure: GO is a G derivative with oxygen functional groups which should promote a closer chemical interaction with TiO2 nanoparticles. Computational models of the fundamental properties of the composites indicated potentially improved photocatalytic activity compared to TiO2, namely lower band gaps and charge carriersegregation at the interfaces. These fundamental properties match qualitatively experimental results on methylene blue, which was more effectively degraded by TiO2/G and TiO2/GO nanocomposites than by pure TiO2 under UV light. In contrast, the same nanocomposites were found to be less efficient to degrade ciprofloxacin than pure TiO2 under visible and UV light. Therefore, this work showcases the relevance of an efficient matching between the catalyst and the molecular properties and structure of the pollutant.

Ask an author a personal copy of its work

RESEARCH LINE


Be sociable, share!
Facebooktwittergoogle_plusredditpinterestlinkedintumblrmailFacebooktwittergoogle_plusredditpinterestlinkedintumblrmail
TOP