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Photocatalytic degradation of indigo carmine using [Zn-Al] LDH supported on PAN nanofibres

Published online by Cambridge University Press:  02 January 2018

K. Abderrazek ,
A. Uheida ,
M. Seffen ,
M. Muhammed ,
N. Frini Srasra  and
E. Srasra
K. Abderrazek*
Affiliation:
National Research Center of Materials Science, Technopark of Borj Cedria, Tunisia Faculty of Sciences of Tunis, Tunis El Manar University, Tunisia
A. Uheida
Affiliation:
Functional Materials Division, Royal Institute of Technology (KTH), Sweden
M. Seffen
Affiliation:
Laboratory of Energy and Materials (LABEM), High School of Sciences and Technology, 4011 Hammam Sousse (Sousse University), Tunisia
M. Muhammed
Affiliation:
Functional Materials Division, Royal Institute of Technology (KTH), Sweden
N. Frini Srasra
Affiliation:
National Research Center of Materials Science, Technopark of Borj Cedria, Tunisia Faculty of Sciences of Tunis, Tunis El Manar University, Tunisia
E. Srasra
Affiliation:
National Research Center of Materials Science, Technopark of Borj Cedria, Tunisia
*
*E-mail: [email protected]
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Abstract

Zn-Al layered double hydroxides (LDH), before and after calcination, were tested for the removal of indigo carmine (IC) dye from solution. These LDH photocatalysts were characterized by powder x-ray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetry/differential thermogravimetry (TG/DTG), nitrogen physisorption at −196°C, scanning electron microscopy (SEM) and diffuse reflectance spectrophotometry (DRS). The different photocatalysts were supported on polyacrylonitrile (PAN) nanofibres, so that filtration was unnecessary.

The PXRD and FTIR analyses showed that the IC adsorption on c-Zn-Al-3-500 (LDH calcined at 500°C) was enhanced by construction of the hydrotalcite matrix intercalated with the dye. The intercalation was clearly evidenced by the appearance of a peak at low °2θ values. All of the materials prepared exhibited photocatalytic activity, which for the c-Zn-Al-3-500 was comparable to that of commercial PAN-supported ZnO nanoparticles (100% degradation after 180 min). Kinetic studies showed that the degradation of the IC followed a pseudo-first order rate. The high activity and the ease of both synthesis and separation processes rendered this photocatalyst a promising candidate for environmental remediation.

Keywords

[Zn-Al] LDHnanofibresindigo carmineretentionphotocatalysis
Type
Research Article
Information
Clay Minerals , Volume 50 , Issue 2 , June 2015 , pp. 185 - 197
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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