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Journal of Thermal Analysis and Calorimetry

, Volume 127, Issue 1, pp 189–196 | Cite as

The effect of microwave and hydrothermal treatments on the properties of hydrotalcite

A comparative study
  • S. Zadaviciute
  • K. Baltakys
  • A. Bankauskaite
Article

Abstract

In this work, a comparative study of the application of direct microwave or hydrothermal synthesis for obtaining hydrotalcite from solid initial materials and the effect of these treatments (200 °C, 1–3 h) on the thermal stability of formed compounds were investigated. The molar ratios of primary mixtures Mg/Al were equal to 1 and 2, while the water/solid ratio was maintained to 10.0. It was determined that the microwave treatment was suitable for the direct synthesis of hydrotalcite, although the intensities of diffraction maximums characteristic to this compound were decreased under all experimental conditions. Furthermore, it was examined that, after 3 h of isothermal curing, the highest crystallinity of hydrotalcite was obtained. It should be noted that, in a case of microwave synthesis, the crystallite size of hydrotalcite varied in a 33.89–38.50 nm range, while, in a case of hydrothermal treatment, in a 40.06–52.45 nm region. Moreover, the method used for the synthesis of the latter compound did not influence the formation sequence of compounds during solid sintering (575 and 1000 °C, 1 h). In both cases, at 575 °C temperature, MgO and Al2O3 were formed, while at 1000 °C—magnesium and aluminium spinel-type compounds, which have a similar chemical nature, were obtained. The synthetic and calcined products were characterized by XRD, STA and SEM analyses.

Keywords

Hydrothermal synthesis Microwave synthesis Hydrotalcite Solid-state sintering Mg/Al spinel-type compounds 

Notes

Acknowledgements

This research was funded by a Grant (No. MTEPI- P-15045) from Kaunas University of Technology priority-inter-field and transdisciplinary research projects.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2016

Authors and Affiliations

  1. 1.Department of Silicate TechnologyKaunas University of TechnologyKaunasLithuania

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