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.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
E.D. Garret, Borates, handbook of deposits, processing, properties and use, Elsevier, 401 (1998).
The Report of Chemical Industry, Turkey State Planning Organization (2001).
D. L. Perry and S. L. Phillips, Handbook of inorganic compounds, CRC Press, New York (1995).
Y. Kojima, K. Suzuki, K. Fukumotoa, Y. Kawai, M. Kimbara, H. Nakanishi and S. Matsumoto, J. Power Sources, 125, 22 (2004).
T. N. Veziroglu, Int. J. Hydrogen Energ., 22, 551 (1997).
I. Dincer, Energy Policy, 27, 845 (1999).
H. I. Schlesinger, H. C. Brown, A. E. Finholt, J. R. Gilbreath, H. R. Hoekstra and E. K. Hyde, J. Am. Chem. Soc., 75, 215 (1953).
J. Kim, H. Lee, S. Han, H. Kim, M. Song and J. Lee, Int. J. Hydrogen Energ., 29, 263 (2004).
B. H. H. Cooper, US Patent, 3,734,842 (1973).
Y. Kojima and T. Haga, Int. J. Hydrogen Energ., 28, 989 (2003).
Z. P. Li, N. Morigazaki, B.H. Liu and S. Suda, J. Alloy Compd., 349, 232 (2003).
H. Jun, S.C. Oh, H. P. Leeand and H.T. Kim, Korean J. Chem. Eng., 23, 761 (2006).
J.W. Park, S. C. Oh, H. P. Lee, H. T. Kim and K.O. Yoo, Korean J. Chem. Eng., 17, 489 (2000).
S. J. Yoon, Y. Choi, S. Lee and J. Lee, Korean J. Chem. Eng., 24, 512 (2007).
S. Piskin, PhD Thesis, Istanbul Technical University, Faculty of Mining, Istanbul, Turkey (1983).
F. Sevim, F. Demir, M. Bilen and H. Okur, Korean J. Chem. Eng., 23, 736 (2006).
Y. Erdogan, A. Zeybek, A. Sahin and A. Demirbas, Thermochim. Acta, 326, 99 (1999).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
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
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11814-008-0218-8