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Photocatalytic decolourization of methylene blue using [Zn-Al] layered double hydroxides synthesized at different molar cationic ratios

Published online by Cambridge University Press:  02 January 2018

Kaouther Abderrazek ,
Najoua Frini Srasra  and
Ezzeddine Srasra
Kaouther Abderrazek*
Affiliation:
Laboratoire de Physico-chimie des Matériaux Minéraux et leurs Applications, Centre National des Recherches en Sciences des Matériaux, Technopôle de Borj Cédria, Tunisie Département de Chimie, Faculté des Sciences de Tunis, Université Tunis El Manar, Tunisie
Najoua Frini Srasra
Affiliation:
Laboratoire de Physico-chimie des Matériaux Minéraux et leurs Applications, Centre National des Recherches en Sciences des Matériaux, Technopôle de Borj Cédria, Tunisie Département de Chimie, Faculté des Sciences de Tunis, Université Tunis El Manar, Tunisie
Ezzeddine Srasra
Affiliation:
Laboratoire de Physico-chimie des Matériaux Minéraux et leurs Applications, Centre National des Recherches en Sciences des Matériaux, Technopôle de Borj Cédria, Tunisie Département de Chimie, Faculté des Sciences de Tunis, Université Tunis El Manar, Tunisie
*
*E-mail:kaoutherabderrazek@yahoo.fr
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Abstract

[Zn-Al] layered double hydroxides (LDH) with cationic molar ratios of R = Zn/Al 1–5 were synthesized by the coprecipitation method at constant pH = 10. The samples synthesized and their derived forms obtained after calcination at 500°C and at 900°C (denoted Zn-Al-R, Zn-Al-R-500 and Zn-Al-R-900, respectively), were characterized by X-ray diffraction (XRD), inductively coupled plasmamass spectrometry, scanning electron microscopy, energy-dispersive X-ray spectroscopy, diffuse reflectance spectroscopy and nitrogen physisorption at −196°C. The XRD study showed: (1) the presence of accessory ZnO with the LDH in samples synthesized with R ≥ 3; and (2) the lamellar structure was destroyed at 500°C which made room for a poorly ordered ZnO phase, while calcination at 900°C yielded well crystallized ZnO and ZnAl2O4. The photocatalytic activity of the calcined and the unheated samples was evaluated for the decolourization of methylene blue. The photocatalytic activity was dependent on the cationic ratio R and on the calcination temperature. The sample Zn-Al-3 displayed maximum photocatalytic activity. Calcination at 500 and 900°C improved the photocatalytic activity of LDH synthesized at R = 1 and 2.

Keywords

[Zn-Al] LDHcationic ratiocalcinationdecolourizationmethylene blue
Type
Research Article
Information
Clay Minerals , Volume 52 , Issue 2 , June 2017 , pp. 203 - 215
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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