Preparation of Magnesium Hydroxide Chloride Hydrate Nanowires Using Calcined Dolomite

doi:10.3724/SP.J.1077.2011.10535

Abstract

Abstract: Magnesiumhydroxide chloride hydrate (MHCH) nanowires are important polymer fillers andprecursors for one-dimensional nanostructures. Here a novel method waspresented to prepareMHCH nanowires using calcined dolomite as raw materials viaa hydrothermal approach. XRD, SEM, and FT-IR analyses indicate that theas-prepared MHCH is well crystallized Mg₁₀(OH)₁₈Cl₂?5H₂Onanowires with diameters of 50-120nm and length of several tens micrometers. The TG-DTA patterns of MHCH consistedof two steps and MHCH is at endothermic status during the whole heatingprocess. The molar ratio of (MgO+CaO) in calcined dolomite to MgCl₂( R) plays a key role to the structureand morphology of MHCH. The aspect ratio of MHCH nanowires decreases with theincreasing of R and Mg(OH)₂will be formed when R was greaterthan 0.5. The optimum R to prepareMHCH is between 0.025 and 0.075. This study will extend the potential applicationsof dolomite due to the extensive applications of MHCH.

Key words: calcined dolomite, m agnesium hydroxide chloride hydrate(MHCH), nanowire, magnesium chloride, hydrothermal

CLC Number:

TB321

CHEN Xue-Gang, L? Shuang-Shuang, LI Xiu-Ti, ZHANG Lu, ZHANG Ping-Ping, YE Ying. Preparation of Magnesium Hydroxide Chloride Hydrate Nanowires Using Calcined Dolomite[J]. Journal of Inorganic Materials, 2011, 26(2): 214-218.

References

[1] Bensted J, Barnes P. Structure and Performance of Cements. London: Taylor & Francis, 2002.

[2] Hornsby P. Multifunctional Barriers for Flexible Structure. Berlin: Springer, 2007.

[3] Jeevanandam P, Mulukutla R S, Yang Z, et al. Nanocrystals to nanorods: a precursor approach for the synthesis of magnesium hydroxide nanorods from magnesium oxychloride nanorods starting from nanocrystalline magnesium oxide. Chem. Mater., 2007, 19(22): 5395-5403.

[4] Fan W L, Sun S X, Song X Y, et al. Controlled synthesis of single- crystalline Mg(OH)2 nanotubes and nanorods via a solvothermal process. J. Solid State Chem., 2004, 177(7): 2329-2338.

[5] Fan W L, Sun S X, You L P, et al. Solvothermal synthesis of Mg(OH)2 nanotubes using Mg10(OH)18Cl2 5H2O nanowires as precursors. J. Mater. Chem., 2003, 13(12): 3062-3065.

[6] Wei Q, Lieber C M. Solution-based Synthesis of Magnesium Oxide Nanorods, Nanophase and Nanocomposite Materials III. Warrendale: Materials Research Society, 2000: 3-7.

[7] Zhao A D, Shen Y S, Zhai X L. A route to prepare magnesium oxide fiber. Journal of Inorganic Materials, 2005, 20(1): 215-219. (in Chinese)

[8] Warren J. Dolomite: occurrence, evolution and economically important associations. Earth Sci. Rev., 2000, 52(1/2/3): 1-81.

[9] Ngamcharussrivichai C, Wiwatnimit W, Wangnoi S. Modified dolomites as catalysts for palm kernel oil transesterification. J. Mol. Catal. A: Chem., 2007, 276(1/2): 24-33.

[10] Sawai J, Himizu K, Yamamoto O. Kinetics of bacterial death by heated dolomite powder slurry. Soil Biology and Biochemistry, 2005, 37(8): 1484-1489.

[11] Ayoub G M, Mehawej M. Adsorption of arsenate on untreated dolomite powder. J. Hazard Mater., 2007, 148(1/2): 259-265.

[12] Duffy A, Walker G M, Allen S J. Investigations on the adsorption of acidic gases using activated dolomite. Chem. Eng. J., 2006, 117(3): 239-244.

[13] Lee S, Dyer J A, Sparks D L, et al. A multi-scale assessment of Pb(II) sorption on dolomite. J. Colloid Interface Sci., 2006, 298(1): 20-30.

[14] Alvarado E, Torres-Martinez L M, Fuentes A F, et al. Preparation and characterization of MgO powders obtained from different magnesium salts and the mineral dolomite. Polyhedron, 2000, 19(22/23): 2345-2351.

[15] Xu L L, Deng M. Dolomite used as raw material to produce MgO- based expansive agent. Cem. Concr. Res., 2005, 35(6): 1480-1485.

[16] Carson R C, Simandl J. Kinetics of magnesium hydroxide precipitation from seawater using slaked dolomite. Miner. Eng., 1994, 7(4): 511-517.

[17] Kameda T, Yoshioka T, Yabuuchi F, et al. Preparation of a hydrotalcite-like compound using calcined dolomite and polyaluminum chloride. J. Mater. Sci., 2007, 42(6): 2194-2197.

[18] Sugimoto K, Dinnebier R E, Schlecht T. Structure determination of Mg3(OH)5Cl 4H2O (F5 phase) from laboratory powder diffraction data and its impact on the analysis of problematic magnesia floors. Acta Crystall. B, 2007, 63(6): 805-815.

[19] Kanesaka I, Aoyama S. Vibrational spectra of magnesia cement, phase 3. J. Raman Spectro., 2001, 32(5) : 361-367.

[20] Mazuranic C, Billinski H, Matkovic B. Reaction products in the system MgC12-NaOH-H2O. J. Am. Ceram. Soc., 1982, 65(10): 523-525.

[21] Ball M C. Reactions of compounds occurring in sorel's cement. Cem. Concr. Res., 1977, 7(5): 575-584.

[22] Chen X G, LV S S, Zhang L, et al. Hydrothermal synthesis and characterization of one-dimensional magnesium hydroxide chloride hydrate in CaO-MgCl2-H2O system. Journal of Inorganic Materials, 2010, 25(2): 129-134. (in Chinese)