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Effects of ultrasonic irradiation on the synthesis, crystallization, thermal and dissolution behaviour of chloride-intercalated, co-precipitated CaFe-layered double hydroxide

Szabados, Márton; Ádám, Adél Anna; Kónya, Zoltán; Kukovecz, Ákos; Carlson, Stefan LU ; Sipos, Pál and Pálinkó, István (2019) In Ultrasonics Sonochemistry
Abstract

The output power (30–150 W) and the periodicity (20–100%) of ultrasound emission were varied in a wide range to regulate and improve the crystallization process in the commonly used co-precipitation technique of chloride-intercalated CaFe-layered double hydroxides. The influence of ultrasound irradiation on the as-prepared materials was studied by X-ray diffractometry, dynamic light scattering, UV–Vis–NIR diffuse reflectance spectroscopy, specific surface area measurement, pore size analysis, ion-selective electrode potentiometric investigations and thermogravimetry. Additionally, structural alterations due to heat treatment at various temperatures were followed in detail by Fourier-transform infrared and X-ray absorption spectroscopies... (More)

The output power (30–150 W) and the periodicity (20–100%) of ultrasound emission were varied in a wide range to regulate and improve the crystallization process in the commonly used co-precipitation technique of chloride-intercalated CaFe-layered double hydroxides. The influence of ultrasound irradiation on the as-prepared materials was studied by X-ray diffractometry, dynamic light scattering, UV–Vis–NIR diffuse reflectance spectroscopy, specific surface area measurement, pore size analysis, ion-selective electrode potentiometric investigations and thermogravimetry. Additionally, structural alterations due to heat treatment at various temperatures were followed in detail by Fourier-transform infrared and X-ray absorption spectroscopies as well as scanning electron microscopy. The ultrasonic treatment was capable of controlling the sizes of primarily formed (from 19 nm to 30 nm) as well as the aggregated (secondary) particles (between 450 nm and 700 nm), and thus modifying their textural parameters and enhancing the incorporation of chloride anions into the interlamellar space. For the first time, the optical energy gap of CaFe-LDH was reported here depending on the nature of applied stirring (4.18–4.34 eV). The heat-treatment investigations revealed that the layered structure was stabile until 200 °C, even at the atomic level.

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organization
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type
Contribution to journal
publication status
epub
subject
keywords
CaFe-layered double hydroxide, Characterization with a range of instrumental techniques, Dissolution and thermal behaviour, NEXAFS/EXAFS investigation, Sonocrystallization
in
Ultrasonics Sonochemistry
publisher
Elsevier
external identifiers
  • scopus:85062389220
ISSN
1350-4177
DOI
10.1016/j.ultsonch.2019.02.024
language
English
LU publication?
yes
id
10a528a8-7109-444e-b5b0-11ebaf8a03b9
date added to LUP
2019-03-14 14:56:53
date last changed
2019-03-22 08:34:15
@article{10a528a8-7109-444e-b5b0-11ebaf8a03b9,
  abstract     = {<p>The output power (30–150 W) and the periodicity (20–100%) of ultrasound emission were varied in a wide range to regulate and improve the crystallization process in the commonly used co-precipitation technique of chloride-intercalated CaFe-layered double hydroxides. The influence of ultrasound irradiation on the as-prepared materials was studied by X-ray diffractometry, dynamic light scattering, UV–Vis–NIR diffuse reflectance spectroscopy, specific surface area measurement, pore size analysis, ion-selective electrode potentiometric investigations and thermogravimetry. Additionally, structural alterations due to heat treatment at various temperatures were followed in detail by Fourier-transform infrared and X-ray absorption spectroscopies as well as scanning electron microscopy. The ultrasonic treatment was capable of controlling the sizes of primarily formed (from 19 nm to 30 nm) as well as the aggregated (secondary) particles (between 450 nm and 700 nm), and thus modifying their textural parameters and enhancing the incorporation of chloride anions into the interlamellar space. For the first time, the optical energy gap of CaFe-LDH was reported here depending on the nature of applied stirring (4.18–4.34 eV). The heat-treatment investigations revealed that the layered structure was stabile until 200 °C, even at the atomic level.</p>},
  author       = {Szabados, Márton and Ádám, Adél Anna and Kónya, Zoltán and Kukovecz, Ákos and Carlson, Stefan and Sipos, Pál and Pálinkó, István},
  issn         = {1350-4177},
  keyword      = {CaFe-layered double hydroxide,Characterization with a range of instrumental techniques,Dissolution and thermal behaviour,NEXAFS/EXAFS investigation,Sonocrystallization},
  language     = {eng},
  month        = {02},
  publisher    = {Elsevier},
  series       = {Ultrasonics Sonochemistry},
  title        = {Effects of ultrasonic irradiation on the synthesis, crystallization, thermal and dissolution behaviour of chloride-intercalated, co-precipitated CaFe-layered double hydroxide},
  url          = {http://dx.doi.org/10.1016/j.ultsonch.2019.02.024},
  year         = {2019},
}