| 柠檬酸钠与碳酸钙晶型和形貌的控制 |
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| 引用本文： | 高艳芳,王海水.柠檬酸钠与碳酸钙晶型和形貌的控制[J].应用化学,2015,32(7):831-836. |
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| 作者姓名： | 高艳芳 王海水 |
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| 作者单位： | 华南理工大学化学与化工学院 广州 510640 |
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| 基金项目： | 国家自然科学基金资助项目(20873136) |
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| 摘 要： | 晶体的晶型和形貌是碳酸钙制备中的关键问题之一。 采用尿素水解均匀沉淀法来控制碳酸钙的晶型和形貌。 利用XRD和SEM等技术手段对CaCO3晶体的结构和形貌进行了表征。 结果表明,高温条件下(90 ℃)水溶液中得到均匀的针状结构的文石晶体。 添加适量柠檬酸钠后,则得到的是特殊形貌的方解石晶体。 在乙醇/水混合溶剂中,柠檬酸钠对CaCO3晶体的形貌也有重要影响,通过改变乙醇体积分数,得到了中空绒毛球状的球霰石。
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| 关 键 词： | 碳酸钙 晶型 柠檬酸钠 乙醇/水混合溶剂 尿素 |
| 收稿时间： | 2014-12-02 |
Control of Crystalline Polymorphs and Morphologies for Calcium Carbonate with Sodium Citrate |
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| GAO Yanfang,WANG Haishui.Control of Crystalline Polymorphs and Morphologies for Calcium Carbonate with Sodium Citrate[J].Chinese Journal of Applied Chemistry,2015,32(7):831-836. |
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| Authors: | GAO Yanfang WANG Haishui |
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| Institution: | School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China |
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| Abstract: | Calcium carbonate with various polymorphs and morphologies was prepared by urea hydrolytic method in this study. The crystals were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. Uniform needle-like aragonite crystals are obtained in aqueous solution at 90 ℃. In contrast, the addition of sodium citrate results in the formation of novel morphologies of calcite crystals. We also studied the growth of calcium carbonate in the mixed solvent of ethanol/water with sodium citrate as control agent. The results show that sodium citrate also has significant influence on polymorphs and morphologies of calcium carbonate in the ethanol/water mixed solution. Hollow spherical vaterite crystals are obtained in the presence of sodium citrate by changing the volume fraction of ethanol. |
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| Keywords: | calcium carbonate polymorphs sodium citrate ethanol/water mixed solutions urea |
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