Photocatalytic activity of exfoliated graphite-TiO2 nanoparticle composites

Gloria Guidetti; Eva A. A. Pogna; Lucia Lombardi; Flavia Tomarchio; Iryna Polishchuk; Rick R. M. Joosten; Alessandro Ianiro; Giancarlo Soavi; Nico A. J. M. Sommerdijk; Heiner Friedrich; Boaz Pokroy; Anna K. Ott; Marco Goisis; Francesco Zerbetto; Giuseppe Falini; Matteo Calvaresi; Andrea C. Ferrari; Giulio Cerullo; Marco Montalti

doi:https://doi.org/10.1039/c9nr06760d

Photocatalytic activity of exfoliated graphite-TiO2 nanoparticle composites

Gloria Guidetti, Eva A. A. Pogna, Lucia Lombardi, Flavia Tomarchio, Iryna Polishchuk, Rick R. M. Joosten, Alessandro Ianiro, Giancarlo Soavi, Nico A. J. M. Sommerdijk, Heiner Friedrich, Boaz Pokroy, Anna K. Ott, Marco Goisis, Francesco Zerbetto, Giuseppe Falini, Matteo Calvaresi, Andrea C. Ferrari, Giulio Cerullo, Marco Montalti

Technion - Israel Institute of Technology

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	19301-19314
Number of pages	14
Journal	Nanoscale
Volume	11
Issue number	41
DOIs	https://doi.org/10.1039/c9nr06760d
State	Published - 7 Nov 2019

All Science Journal Classification (ASJC) codes

General Materials Science

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Guidetti, G., Pogna, E. A. A., Lombardi, L., Tomarchio, F., Polishchuk, I., Joosten, R. R. M., Ianiro, A., Soavi, G., Sommerdijk, N. A. J. M., Friedrich, H., Pokroy, B., Ott, A. K., Goisis, M., Zerbetto, F., Falini, G., Calvaresi, M., Ferrari, A. C., Cerullo, G., & Montalti, M. (2019). Photocatalytic activity of exfoliated graphite-TiO2 nanoparticle composites. Nanoscale, 11(41), 19301-19314. https://doi.org/10.1039/c9nr06760d

@article{d5ae59d387f440469062f9bbdd86acbe,

title = "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.",

author = "Gloria Guidetti and Pogna, {Eva A. A.} and Lucia Lombardi and Flavia Tomarchio and Iryna Polishchuk and Joosten, {Rick R. M.} and Alessandro Ianiro and Giancarlo Soavi and Sommerdijk, {Nico A. J. M.} and Heiner Friedrich and Boaz Pokroy and Ott, {Anna K.} and Marco Goisis and Francesco Zerbetto and Giuseppe Falini and Matteo Calvaresi and Ferrari, {Andrea C.} and Giulio Cerullo and Marco Montalti",

note = "Publisher Copyright: {\textcopyright} 2019 The Royal Society of Chemistry.",

year = "2019",

month = nov,

day = "7",

doi = "https://doi.org/10.1039/c9nr06760d",

language = "الإنجليزيّة",

volume = "11",

pages = "19301--19314",

journal = "Nanoscale",

issn = "2040-3364",

publisher = "Royal Society of Chemistry",

number = "41",

}

Guidetti, G, Pogna, EAA, Lombardi, L, Tomarchio, F, Polishchuk, I, Joosten, RRM, Ianiro, A, Soavi, G, Sommerdijk, NAJM, Friedrich, H, Pokroy, B, Ott, AK, Goisis, M, Zerbetto, F, Falini, G, Calvaresi, M, Ferrari, AC, Cerullo, G & Montalti, M 2019, 'Photocatalytic activity of exfoliated graphite-TiO2 nanoparticle composites', Nanoscale, vol. 11, no. 41, pp. 19301-19314. https://doi.org/10.1039/c9nr06760d

TY - JOUR

T1 - Photocatalytic activity of exfoliated graphite-TiO2 nanoparticle composites

AU - Guidetti, Gloria

AU - Pogna, Eva A. A.

AU - Lombardi, Lucia

AU - Tomarchio, Flavia

AU - Polishchuk, Iryna

AU - Joosten, Rick R. M.

AU - Ianiro, Alessandro

AU - Soavi, Giancarlo

AU - Sommerdijk, Nico A. J. M.

AU - Friedrich, Heiner

AU - Pokroy, Boaz

AU - Ott, Anna K.

AU - Goisis, Marco

AU - Zerbetto, Francesco

AU - Falini, Giuseppe

AU - Calvaresi, Matteo

AU - Ferrari, Andrea C.

AU - Cerullo, Giulio

AU - Montalti, Marco

PY - 2019/11/7

Y1 - 2019/11/7

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85074119283&partnerID=8YFLogxK

U2 - https://doi.org/10.1039/c9nr06760d

DO - https://doi.org/10.1039/c9nr06760d

M3 - مقالة

SN - 2040-3364

VL - 11

SP - 19301

EP - 19314

JO - Nanoscale

JF - Nanoscale

IS - 41

ER -

Photocatalytic activity of exfoliated graphite-TiO2 nanoparticle composites

Abstract

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