碱式氯化镁(MHCH)纳米线是一种重要的高分子填充剂及一维纳米结构的前驱体.本文以白云岩锻粉为原料,利用水热反应制备了MHCH纳米线.通过XRD、SEM和FT-IR表征表明所制备的MHCH是完好结晶的Mg10(OH)1sCl2.5H2O纳米线,其直径和长度分别为50～120nm和数十微米.TG-DTA测试表明,MHCH的热分解分为两步,在加热过程中MHCH始终处于吸热状态.白云石锻粉中的MgO和CaO与氯化镁的摩尔比R对MHCH的结构和形貌具有重要的影响:MHCH的长径比随R的增大而减小,而当R大于0.5时,体系中将出现Mg(OH)2;制备MHCH的最佳摩尔比R在0.025和0.075之间.由于MHCH用途广泛,本研究将拓宽白云石的潜在应用价值.
Magnesium hydroxide chloride hydrate (MHCH) nanowires are important polymer fillers and precursors for one-dimensional nanostructures. Here a novel method was presented to prepare MHCH nanowires using calcined dolomite as raw materials via a hydrothermal approach. XRD, SEM, and FT-IR analyses indicate that the as-prepared micrometers. The TG-DTA patterns of MHCH consisted of two steps and MHCH is at endothermic status during the whole heating process. The molar ratio of (MgO+CaO) in calcined dolomite to MgCl2 (R) plays a key role to the structure and morphology of MHCH. The aspect ratio of MHCH nanowires decreases with the increasing of R and Mg(OH)2 will be formed when R was greater than 0.5. The optimum R to prepare MHCH is between 0.025 and 0.075.This study will extend the potential applications of dolomite due to the extensive applications of MHCH.
参考文献
| [1] | Bensted J,Barnes P.Structure and Performance of Cements.London:Taylor & Francis,2002. |
| [2] | Homsby 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 singlecrystalline 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] | Daffy 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 MgObased 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)5C1 4H2,O (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) |
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