Crystallization Control of CaCO3 by Ionic Liquids in Aqueous Solution
Crystallization Control of CaCO3 by Ionic Liquids in Aqueous Solution
复制标题
DOI：
10.1021/cg900771c
复制
发表时间：
2009-11-01
影响因子：
3.8
通讯作者：
Wang, Jianji
中科院分区：
文献类型：
--
作者：
Zhao, Yang;Chen, Zhenhua;Wang, Jianji
本文研究了咪唑基离子液体(ILS)对碳酸钙(CaCO3)结晶的控制。选择1-十二基-3-甲基咪唑溴([C(12)mim]BR)和1-丁基-3-甲基咪唑溴([C(4)mim]BR)作为晶体生长模板。在[C(12)mim]BR和[C(4)mim]BR的存在下，分别容易得到棒状和树枝状的文石纳米颗粒。用扫描电子显微镜和过渡电子显微镜研究了合成的CaCO3晶体从经典的方解石菱面体到特殊的树枝状和棒状文石纳米粒子的形态变化。用X-射线衍射仪证实了所得晶体的相变。结果表明，较高的反应温度有利于文石的生成，纯文石的最适pH值为11。离子液体控制碳酸钙矿化是一种简单、新颖、环境友好的合成文石纳米颗粒的方法。
In this paper, the calcium carbonate (CaCO3) crystallization con trolled by imidazolium based ionic liquids (ILs) was investigated. 1-Dodecyl-3-methylimidazolium bromide ([C(12)mim]Br) and 1-butyl-3-methylimidazolium bromide ([C(4)mim]Br) were chosen as crystal growth template. Rodlike and dendritelike aragonite nanoparticles were obtained easily in the presence of[C(12)mim]Br and [C(4)mim]Br, respectively. The morphology changes of the as-prepared CaCO3 crystals from classical calcite rhombohedron to unusual dendritelike and rodlike aragonite nanoparticles were studied by using scanning electron microscopy and transition electron microscopy. The phase change of the obtained crystals was confirmed by using X-ray diffraction. It was shown that the higher reaction temperature favors the production of aragonite, and the optimal pH for pure aragonite phase is 11. Mineralization of CaCO3 controlled by ILs is a simple, novel, and environmentally friendly strategy for aragonite nanoparticles synthesis.