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  • 1 Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
  • | 2 Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
  • | 3 Advanced Functional Materials Research Cluster, Khon Kaen University, Khon Kaen, Thailand
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Abstract

The DSC and TG data showed the dehydration process occurring over the range of 160–300 °C. The XRD patterns of the synthesized KNiPO4·H2O and the calcined product at 350 °C with exposing in the air over 8 h are indexed as the KNiPO4·H2O structure, whereas at 600 °C is indexed as KNiPO4 structure. Hence, these data confirmed that the water molecule was eliminated from the structure at 300 °C, after that the spontaneously reversible hydration–rehydration process was observed. The activation energy and pre-exponential factor were calculated by Kissinger, Ozawa, and KAS equations. According to the DSC curves, the enthalpy change (ΔH) of dehydration process can be calculated and was found to be 100.12 kJ mol−1. Besides, we suggested another new method to determine the isokinetic temperature value using spectroscopic data. The surface area of synthesized hydrate and its calcined product at 350 °C with exposing in the air at over 8 h were found to be 21.48 and 134.3 m2 g−1, respectively. The reversible hydration–rehydration process was observed, and the surface area of final product at 350 °C (aging time over 8 h) is higher than that of the synthesized compound. This behavior is important to develop alternative desiccant materials or other process based on the rehydration mechanism with increasing the surface area.

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  • Impact Factor (2019): 2.731
  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)