Study of the photocatalytic activity of Fe3+, Cr3+, La3+ and Eu3+ single-doped and co-doped TiO2 catalysts produced by aqueous sol-gel processing

Malengreaux, Charline; Pirard, Sophie; Léonard, Géraldine; Mahy, Julien; Herlitschke, Marcus; Klobes, Benedikt; Hermann, Raphaël; Heinrichs, Benoît; Bartlett, John

doi:10.1016/j.jallcom.2016.08.211

Article (Scientific journals)

Study of the photocatalytic activity of Fe3+, Cr3+, La3+ and Eu3+ single-doped and co-doped TiO2 catalysts produced by aqueous sol-gel processing

Malengreaux, Charline; Pirard, Sophie; Léonard, Géraldine et al.

2017 • In Journal of Alloys and Compounds, 691, p. 726-738

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/202519

DOI
10.1016/j.jallcom.2016.08.211

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Keywords :

Aqueous sol-gel process; Photocatalysis; TiO2; Single-doped; Co-doped catalyst

Abstract :

[en] An aqueous sol-gel process, previously developed for producing undoped and Cu2+, Ni2+, Zn2+ or Pb2+ doped TiO2 photocatalysts with remarkably high photocatalytic activity without requiring any calcination step, has been adapted to produce Fe3+, Cr3+, La3+ or Eu3+ single-doped TiO2 photocatalysts as well as La3+-Fe3+ and Eu3+-Fe3+ co-doped TiO2 catalysts. The physicochemical properties of the obtained catalysts have been characterized using a suite of complementary techniques, including ICP-AES, XRD, UV-Vis spectroscopy, nitrogen adsorption-desorption and Fe-57 Mössbauer. The active crystalline phase is obtained without requiring any calcination step and all the different catalysts are composed of nanocrystallites of anatase with a size of 6-7 nm and a high specific surface area varying from 181 to 298 m² g-1. In this study, the effect of the NO3:Ti(IV) mole ratio used to induce the peptisation reaction during the synthesis has been studied and the results revealed that this ratio can influence significantly the textural properties of the resulting catalyst. A screening of the photocatalytic activity of the undoped and Fe3+, Cr3+, La3+ or Eu3+ single-doped and co-doped photocatalysts has been performed by evaluating the degradation of 4-nitrophenol under UV-Visible light (330 nm < λ < 800 nm). This study suggests that the photocatalytic activity is significantly influenced by the dopant nature and content with an optimal dopant content being observed in the case of Fe3+ or La3+ single-doped as well as in the case of La3+-Fe3+ and Eu3+-Fe3+ co-doped catalysts. In the case of Cr3+ single-doped catalysts, a detrimental effect of the dopant on the photocatalytic degradation of 4-nitrophenol has been observed while no significant influence of the dopant has been detected in the case of Eu3+ single-doped catalysts. The role of the different dopants in modulating the photocatalytic activity is discussed.

Disciplines :

Chemical engineering
Materials science & engineering

Author, co-author :

Malengreaux, Charline

Pirard, Sophie ; Université de Liège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces

Léonard, Géraldine ; Université de Liège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces

Mahy, Julien ; Université de Liège > Department of Chemical Engineering > Génie chimique - Procédés et développement durable

Herlitschke, Marcus

Klobes, Benedikt

Hermann, Raphaël ; Université de Liège > Département de chimie (sciences) > Département de chimie (sciences)

Heinrichs, Benoît ; Université de Liège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces

Bartlett, John

Language :

English

Title :

Study of the photocatalytic activity of Fe3+, Cr3+, La3+ and Eu3+ single-doped and co-doped TiO2 catalysts produced by aqueous sol-gel processing

Publication date :

2017

Journal title :

Journal of Alloys and Compounds

ISSN :

0925-8388

eISSN :

1873-4669

Publisher :

Elsevier Science, Lausanne, Switzerland

Volume :

691

Pages :

726-738

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 12 October 2016

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