Enhancing the light absorption and dielectric properties of nitrate intercalated Zn-Al Layered double hydroxide through anionic exchange with ethylenediaminetetraacetate

Herein, we have reported a comparative study of two Zn-Al Layered double hydroxides (LDH) intercalated by nitrate (NO3−) and ethylenediaminetetraacetate (EDTA) ions, respectively. Indeed, nitrate-intercalated LDH was prepared by the coprecipitation method at a constant pH with Zn/Al = 2 (molar ratio...

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Bibliographic Details
Published in:	Applied clay science Vol. 238; p. 106928
Main Authors:	Ben Zarouala, K., Elhatimi, W., Lahkale, R., Rhalmi, O., Chouni, K., El Kasiti, W., Sabbar, E.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 15-06-2023
Subjects:	Anionic exchange Electrical properties, dielectric properties Impedance spectroscopy, diffuse reflectance spectroscopy Optical properties Zn–Al–EDTA LDH Zn–Al–NO3 LDH Zn–Al–EDTA LDH Impedance spectroscopy, diffuse reflectance spectroscopy Zn–Al–NO3 LDH Electrical properties, dielectric properties Optical properties Anionic exchange
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Summary:	Herein, we have reported a comparative study of two Zn-Al Layered double hydroxides (LDH) intercalated by nitrate (NO3−) and ethylenediaminetetraacetate (EDTA) ions, respectively. Indeed, nitrate-intercalated LDH was prepared by the coprecipitation method at a constant pH with Zn/Al = 2 (molar ratio), and used as a precursor for the synthesis of EDTA intercalated LDH through the anionic exchange method. Subsequently, these two LDH were analyzed by inductively coupled plasma, characterized by X–ray diffraction, thermogravimetric analysis and three spectroscopic techniques: Fourier transform infrared spectroscopy, diffuse reflectance spectroscopy and impedance spectroscopy. The exchange of nitrate ions by EDTA led to a decrease in the electrical conductivity, dielectric constant and dielectric loss tangent, and revealed an important increase in the absorption coefficient in UV–Vis–NIR range, with a large gap energy of approximately 6.30 eV. This work demonstrates the advantage of EDTA ions in decreasing the dielectric dissipation energy, and improving the light absorption of LDH compound. •Nitrate intercalated Zn–Al–LDH was synthesized and used to prepare EDTA intercalated Zn–Al–LDH.•The absorption in UV–Vis–NIR has been much improved upon the exchange of nitrate with EDTA.•EDTA enhanced the dielectric properties of the LDH by decreasing its dissipation energy.•EDTA conducted to a great decline in electrical conductivity and dielectric constant of the LDH.•Zn–Al–LDH intercalated with EDTA can be used in photocatalysis owing to its good light absorption.
ISSN:	0169-1317 1872-9053
DOI:	10.1016/j.clay.2023.106928