Modification of Titanium (IV) Dioxide with Small Silver Nanoparticles: Application in Photocatalysis

E. Grabowska; Adriana Zaleska-Medynska; S. Sorgues; M. Kunst; A. Etcheberry; Christophe Colbeau-Justin; H. Remita

Modification of Titanium (IV) Dioxide with Small Silver Nanoparticles: Application in Photocatalysis

Abstract

The surface of commercial TiO2 compounds (P25 and ST01) has been modified with Ag nanoparticles induced by radiolysis. On P25, the Ag nanoclusters are very small (1−2 nm) and homogeneous in size while on ST01, two populations of nanoparticles are obtained, small nanoparticles (1−2 nm) and larger ones (mean diameter 7 to 12 nm depending on the silver loading). The photocatalytic properties of Ag-modified TiO2 have been studied for phenol photodegradation in aqueous suspensions under UV and visible light. Their electronic properties have been studied by time resolved microwave conductivity (TRMC) to follow the charge-carrier dynamics. TRMC measurements show that the TiO2 modification (P25 and ST01) with Ag nanoparticles plays a role in charge-carrier separations increasing the activity under UV light. Indeed, Ag nanoparticles act as electron scavengers, decreasing the charge carrier recombination. TRMC measurements show also that more electrons are produced in the conduction band of P25 under UV illumination of Ag-modified P25. Surface modification by silver nanoparticles induces also a modification of the absorption properties of the photocatalyst creating an activity under visible light

Authors (7)

E. Grabowska
- University of Gdansk Environmental Engineering
Adriana Zaleska-Medynska prof. dr hab. inż.
S. Sorgues
- Univ Paris-Sud Laboratoire de Chimie Physique
M. Kunst
- Institute Solar Fuels and Energy Storag Helmholtz Zentrum Berlin fu ̈ r Materialien und Energie
A. Etcheberry
- Institut Lavoisier de Versaille Institut Lavoisier de Versaille
Christophe Colbeau-Justin
- Univ Paris-Sud Laboratoire de Chimie Physique
H. Remita
- Univ Paris-Sud Laboratoire de Chimie Physique

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: Journal of Physical Chemistry C no. 117, pages 1955 - 1962,
ISSN: 1932-7447
Language:: English
Publication year:: 2013
Bibliographic description:: Grabowska E., Zaleska-Medynska A., Sorgues S., Kunst M., Etcheberry A., Colbeau-Justin C., Remita H.: Modification of Titanium (IV) Dioxide with Small Silver Nanoparticles: Application in Photocatalysis // Journal of Physical Chemistry C. -Vol. 117, nr. 4 (2013), s.1955-1962
Verified by:: Gdańsk University of Technology