Electronic band structure and visible-light photocatalytic activity of Bi2WO6: elucidating the effect of lutetium doping

H. Ait Ahsaine; A. El jaouhari; A. Slassi; M. Ezahri; A. Benlhachemi; B. Bakiz; F. Guinneton; J.-R. Gavarri

doi:10.1039/C6RA22669H

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Electronic band structure and visible-light photocatalytic activity of Bi₂WO₆: elucidating the effect of lutetium doping†

H. Ait Ahsaine,

*^a A. El jaouhari,^a A. Slassi,^b M. Ezahri,^a A. Benlhachemi,^a B. Bakiz,^a F. Guinneton^c and J.-R. Gavarri^c

Author affiliations

* Corresponding authors

^a Laboratoire Matériaux et Environnement LME, Faculté des Sciences, Université Ibn Zohr, BP 8106, Cité Dakhla, Agadir, Morocco
E-mail: a.hassan@uiz.ac.ma
Tel: +212 676363621

^b LMPHE (URAC 12), Faculté des Sciences, Université Mohammed V-Agdal, Rabat, Morocco

^c IM2NP, UMR CNRS 7334, Université de Toulon, BP 20132, La Garde Cedex, France

Abstract

Bismuth tungstate and 5% Lu-doped bismuth tungstate photocatalysts were synthesized by coprecipitation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectra (DRS), and Brunauer–Emmett–Teller (BET) surface area. The effect of lutetium doping on electronic structure was investigated using density functional theory calculations (DFT). The change of morphological and optical band gap was conditioned by lutetium doping. Under visible light irradiation, the as-prepared sheet-like Lu-Bi₂WO₆ sample exhibits the highest visible-light-responsive photocatalytic performance than pure Bi₂WO₆ for the degradation of Methylene Blue (MB). The photocatalytic mechanism was explained on the basis of electrochemical impedance spectroscopy (EIS), photoluminescence (PL) spectra, active trapping measurements and optoelectronic properties.

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Article information

DOI: https://doi.org/10.1039/C6RA22669H
Article type: Paper
Submitted: 11 Sep 2016
Accepted: 13 Oct 2016
First published: 19 Oct 2016

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RSC Adv., 2016,6, 101105-101114

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Electronic band structure and visible-light photocatalytic activity of Bi₂WO₆: elucidating the effect of lutetium doping

H. Ait Ahsaine, A. El jaouhari, A. Slassi, M. Ezahri, A. Benlhachemi, B. Bakiz, F. Guinneton and J.-R. Gavarri, RSC Adv., 2016, 6, 101105 DOI: 10.1039/C6RA22669H

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