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Synthesis, crystal structure and dehydration kinetics of NaB(OH)4·2H2O

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Abstract

Sodium metaborate tetrahydrate (NaB(OH)4·2H2O) was synthesized by reaction of anhydrous borax (Na2O·2B2O3) with sodium hydroxide (NaOH) under conditions at 90 °C for 150 min. The structure was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM) and Thermogravimetric (TG) analyses. Moreover, dehydration kinetics of NaB(OH)4·2H2O was carried out under non-isothermal conditions and the Coats-Redfern method was applied to analyze the TG data for calculation of activation energies (E a ) and pre-exponential factors (k o ) for different heating rates. It was determined that dehydration of sodium metaborate tetrahydrate occurred in five steps. According to the Coats-Redfern non-isothermal model, E a and k o were calculated as 50.89 kJ/mol and 26×104 min−1 for region I, 18.51 kJ/mol and 0.87×103 min−1 for region II, 15.72 kJ/mol and 0.52×103 min−1 for region III, 4.37 kJ/mol and 0.04×103 min−1 for region IV and 37.42 kJ/mol and 8.56×103 min−1 for region V, respectively.

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Correspondence to Sabriye Piskin.

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Kanturk, A., Sari, M. & Piskin, S. Synthesis, crystal structure and dehydration kinetics of NaB(OH)4·2H2O. Korean J. Chem. Eng. 25, 1331–1337 (2008). https://doi.org/10.1007/s11814-008-0218-8

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  • DOI: https://doi.org/10.1007/s11814-008-0218-8

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