- Eurasian Journal of Biological and Chemical Sciences
- Vol: 2 Issue: 2
- Thermal kinetics and thermodynamics of the dehydration reaction of Mg3(PO4)2·22H2O
Thermal kinetics and thermodynamics of the dehydration reaction of Mg3(PO4)2·22H2O
Authors : Fatma Tuğçe Şenberber, Emek Möröydor Derun
Pages : 47-51
View : 28 | Download : 9
Publication Date : 2019-12-06
Article Type : Research
Abstract :Mg 3 (PO 4 ) 2 ·22H 2 O lost its crystal water in the temperature range of 40 - 200°C and the calcined sample was identified as Mg 3 (PO 4 ) 2 , was a notable for its further treatments in optical and electrical applications. Dehydration process was studied using non-isothermal thermogravimetry (TG) applying model-fitting method. Different mechanism models (chemical reaction order, diffusion and phase interfacial reaction) were applied. The activation energies calculated for the dehydration reaction; and average of activation energy was found as 160 kJ/mol. The better kinetic model of the dehydration reaction for Mg 3 (PO 4 ) 2 ·22H 2 O was selected as F3 (chemical reaction - third order). The thermodynamic functions (ΔH, ΔG and ΔS) of the dehydration reaction were calculated by the activated complex theory and found that the process was endothermic, non-spontaneous and fast.Keywords : Magnesium phosphate, decomposition kinetic, thermal behaviour, thermodynamic