Geopolymers
Inorganic polymeric new materials
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Chanaiporn Danvirutai
Chanaiporn Danvirutai
Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
Advanced Functional Materials Research Cluster, Khon Kaen University, Khon Kaen, Thailand
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Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
Advanced Functional Materials Research Cluster, Khon Kaen University, Khon Kaen, Thailand
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Pittayagorn Noisong
Pittayagorn Noisong
Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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Tipaporn Srithanrattana
Tipaporn Srithanrattana
Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, 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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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
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1 |
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24 |
| Founder | Akadémiai Kiadó |
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H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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