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Preparation of mesoporous ZnAlO nanoflakes by ion exchange from a Na-dawsonite parent material in the presence of an ionic liquid
Herein, mesoporous ZnAl 2 O 4 spinel nanoflakes were prepared by an ion-exchange method from a Na-dawsonite parent material in the presence of an ionic liquid, 1-butyl-2,3-dimethylimidazolium chloride ([bdmim][Cl]), followed by calcination at 700 °C for 2 h. The as-obtained products were characteriz...
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Published in: | RSC advances 2019-04, Vol.9 (21), p.11894-119 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | |
Online Access: | Get full text |
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Summary: | Herein, mesoporous ZnAl
2
O
4
spinel nanoflakes were prepared by an ion-exchange method from a Na-dawsonite parent material in the presence of an ionic liquid, 1-butyl-2,3-dimethylimidazolium chloride ([bdmim][Cl]), followed by calcination at 700 °C for 2 h. The as-obtained products were characterized by several techniques such as X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). The ZnAl
2
O
4
nanoflakes with the thickness of ∼20 nm were composed of numerous nanoparticles, which resulted in a high specific surface area of 245 m
2
g
−1
. The formation mechanism of the ZnAl
2
O
4
nanoflakes was comprehensively investigated, and the results showed that a 2D growth process of the Zn
6
Al
2
(OH)
16
(CO
3
)·4H
2
O crystallites with the assistance of [bdmim][Cl] was the key for the induction of ZnAl
2
O
4
nanoflakes. Moreover, mesopores were formed between adjacent nanoparticles due to the release of CO
2
and H
2
O molecules from Zn
6
Al
2
(OH)
16
(CO
3
)·4H
2
O during the calcination process.
Herein, mesoporous ZnAl
2
O
4
spinel nanoflakes were prepared by an ion-exchange method from a Na-dawsonite parent material in the presence of an ionic liquid, 1-butyl-2,3-dimethylimidazolium chloride ([bdmim][Cl]), followed by calcination at 700 °C for 2 h. |
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ISSN: | 2046-2069 |
DOI: | 10.1039/c8ra10524c |