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Title: Thermal dehydration kinetics of non-crystalline manganese borate
Authors: Tugrul, Nurcan
Firat, Ebru
Kipcak, Azmi Seyhun
Yildirim, Meral
Senberber, Fatma Tugce
Derun, Emek Moroydor
Keywords: Non-crystalline;Non-isothermal kinetics;Manganese borate;Coats-Redfern;Horowitz-Metzger;Van-Krevelen
Issue Date: Mar-2020
Publisher: NISCAIR-CSIR, India
Abstract: In this study, non-crystalline manganese tetrahydric orthoborate (MnH4(BO3)2) has been synthesized by using MnSO4.H2O, NaOH and H3BO3 via hydrothermal method. The characterizations of the synthesized compounds have been conducted using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Thermal dehydration studies have been conducted using the thermogravimetric analysis (DTG/TG). From the XRD result, it is confirmed that amorphous manganese borate is synthesized and the corresponding characteristic borate vibration are observed in FTIR spectrum shows. A particle size distribution at the micron scale with partially agglomerated state is observed from SEM images. The thermogravimetric results show that dehydration process occurs between the temperatures of 40–270 °C in one-step reaction with average weight loss of 19.26%. Average activation energies have been determined by using the non-isothermal kinetics methods of Coats-Redfern, Horowitz-Metzger and Van-Krevelen and found as 37.83, 46.54 and 37.88 kJ mol−1, respectively.
Page(s): 346-350
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.59A(03) [March 2020]

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