Issue 41, 2019

Photocatalytic activity of exfoliated graphite–TiO2 nanoparticle composites

Abstract

We investigate the photocatalytic performance of composites prepared in a one-step process by liquid-phase exfoliation of graphite in the presence of TiO2 nanoparticles (NPs) at atmospheric pressure and in water, without heating or adding any surfactant, and starting from low-cost commercial reagents. These show enhanced photocatalytic activity, degrading up to 40% more pollutants with respect to the starting TiO2-NPs, in the case of a model dye target, and up to 70% more pollutants in the case of nitrogen oxides. In order to understand the photo-physical mechanisms underlying this enhancement, we investigate the photo-generation of reactive species (trapped holes and electrons) by ultrafast transient absorption spectroscopy. We observe an electron transfer process from TiO2 to the graphite flakes within the first picoseconds of the relaxation dynamics, which causes the decrease of the charge recombination rate, and increases the efficiency of the reactive species photo-production.

Graphical abstract: Photocatalytic activity of exfoliated graphite–TiO2 nanoparticle composites

Article information

Article type
Communication
Submitted
07 اگست 2019
Accepted
22 ستمبر 2019
First published
18 اکتوٗبر 2019

Nanoscale, 2019,11, 19301-19314

Photocatalytic activity of exfoliated graphite–TiO2 nanoparticle composites

G. Guidetti, E. A. A. Pogna, L. Lombardi, F. Tomarchio, I. Polishchuk, R. R. M. Joosten, A. Ianiro, G. Soavi, N. A. J. M. Sommerdijk, H. Friedrich, B. Pokroy, A. K. Ott, M. Goisis, F. Zerbetto, G. Falini, M. Calvaresi, A. C. Ferrari, G. Cerullo and M. Montalti, Nanoscale, 2019, 11, 19301 DOI: 10.1039/C9NR06760D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements