碳酸钙空心微球的合成及其生成机理

doi:10.16085/j.issn.1000-6613.2017.03.030

化工进展 ›› 2017, Vol. 36 ›› Issue (03): 989-995.DOI: 10.16085/j.issn.1000-6613.2017.03.030

碳酸钙空心微球的合成及其生成机理

郑天文, 陈雪梅

华东理工大学化工学院, 超细粉末国家工程研究中心, 上海 200237

收稿日期:2016-06-21 修回日期:2016-09-28 出版日期:2017-03-05 发布日期:2017-03-05
通讯作者: 陈雪梅,副教授,主要从事纳米材料制备与应用。
作者简介:郑天文(1992-),男,硕士研究生,研究方向为超细粉体材料的制备和应用研究。E-mail:xiaotwzheng@163.com。

Synthesis and formation mechanism of calcium carbonate hollow microspheres

ZHENG Tianwen, CHEN Xuemei

National Engineering Research Center of Ultrafine Powder, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2016-06-21 Revised:2016-09-28 Online:2017-03-05 Published:2017-03-05

摘要/Abstract

摘要：

以Na₂CO₃和CaCl₂为原料，采用复分解方法，以聚丙烯酸（PAA）和十二烷基磺酸钠（SDS）为有机添加剂，合成出具有方解石和球霰石复合晶型的碳酸钙空心微球。利用扫描电子显微镜（SEM）、透射式电子显微镜（TEM）、X射线衍射（XRD）分别对样品的形貌、结构和晶型进行了表征，通过研究反应过程中碳酸钙微球的结构和晶型随时间的变化过程，对空心微球的形成机理进行了详细的探讨；考察不同反应温度、PAA和SDS浓度对碳酸钙结晶和生长的影响。研究结果表明：反应过程中PAA和SDS会影响碳酸钙的聚集行为和形貌结构，以此提出了一种鲜有报道的碳酸钙空心微球的形成机理；并且当反应温度为80℃、PAA浓度0.5g/L、SDS浓度10mmol/L，反应1h时可获得粒径范围为4～7μm、具有方解石和球霰石复合晶型的碳酸钙空心微球。

关键词: 碳酸钙, 空心微球, 合成, 结晶, 聚集

Abstract:

The calcium carbonate hollow microspheres with vaterite and calcite polymorph were synthesized by the complex decomposition method of aqueous solutions Na₂CO₃ and CaCl₂ in the presence of poly(acrylic acid)(PAA) and sodium dodecyl sulfonate(SDS). The morphology,structure and polymorph of the products were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM),X-ray diffraction(XRD),and the formation mechanism of calcium carbonate hollow microspheres was discussed in detail through the study of the dynamic change of the structure and polymorph of calcium carbonate microspheres with time in the reaction process. The effects of reaction temperature,PAA and SDS concentration on the crystallization and growth of calcium carbonate were also investigated. The results showed that PAA and SDS could affect the aggregation behavior and morphology of calcium carbonate in the reaction process. Then it put forward a rarely reported formation mechanism of the hollow microspheres. Under the conditions of reaction temperature of 80℃,PAA concentration of 0.5g/L,SDS concentration of 10mmol/L and reaction time of 1h,calcium carbonate hollow microspheres with calcite and vaterite compound polymorph and particle diameters in the range of 4~7μm could be obtained.

Key words: calcium carbonate, hollow microspheres, synthesis, crystallization, aggregation

中图分类号:

TQ127.1⁺3

郑天文, 陈雪梅. 碳酸钙空心微球的合成及其生成机理[J]. 化工进展, 2017, 36(03): 989-995.

ZHENG Tianwen, CHEN Xuemei. Synthesis and formation mechanism of calcium carbonate hollow microspheres[J]. Chemical Industry and Engineering Progress, 2017, 36(03): 989-995.

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碳酸钙空心微球的合成及其生成机理

Synthesis and formation mechanism of calcium carbonate hollow microspheres

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