Crystallization of calcium carbonate controlled by Pluronic P123 in room-temperature ionic liquid |
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| Authors: | Yingyuan Zhao Ni Cheng Min Liu Li Yu |
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| Affiliation: | 1. Key Lab for Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, 250100, People’s Republic of China
2. School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252059, People’s Republic of China
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| Abstract: | The crystallization of calcium carbonate (CaCO3) controlled by Pluronic P123 in a room-temperature ionic liquid, ethylamine nitrate (EAN), was investigated. The CaCO3 aggregates were obtained by rapid mixing of ammonium carbonate ((NH4)2CO3) and calcium chloride (CaCl2). Cubic calcite, spherical vaterite, and bagel-like vaterite were obtained easily by changing P123 concentration and reaction temperature. The morphologies of the as-prepared CaCO3 aggregates were investigated by transmission electron microscopy and scanning electronic microscopy. The phase change of the obtained crystals was confirmed by X-ray diffraction and Fourier transform infrared spectroscopy. It was shown that higher P123 concentration and higher reaction temperature favor the formation of vaterite in EAN. Unusual bagel-like vaterite was first obtained at 60 °C in the presence of 5 g/L P123 in EAN. Mineralization of CaCO3 regulated by P123 in EAN is a simple, novel, and environment-friendly strategy for vaterite synthesis. |
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