维生素C调控合成纯球霰石及其形成机理

doi:10.16552/j.cnki.issn1001-1625.2024.0824

摘要/Abstract

摘要： 为建立一种以氯化钙为原料合成高纯度球霰石型碳酸钙并封存CO₂的工艺,本文采用氯化钙为钙源,使用CO₂碳化法,维生素C为晶型调控剂调控合成球霰石。利用X射线衍射仪、傅里叶变换红外光谱仪、扫描电子显微镜等对产物进行表征,研究不同维生素C浓度对制备碳酸钙晶型和形貌的影响,并探讨在维生素C调控下球霰石可能的形成机理。结果表明:维生素C对稳定球霰石多晶型的效果显著,未加入维生素C时,产物为球霰石与方解石的混合物,添加质量分数0.1%的维生素C即可得到纯度为100%的球霰石。此外,随着维生素C浓度增加,碳酸钙比表面积由3.63 m²/g提高到11.62 m²/g,晶体粒径由1～3 μm减小到0.3～0.6 μm。本研究提供了一种简便、绿色、低成本制备纯球霰石的方法,同时可以安全有效地封存CO₂温室气体。

关键词: 球霰石, 维生素C, 碳酸钙, 二氧化碳, 晶型调控剂

Abstract: In order to establish a process of synthesizing high purity vaterite calcium carbonate with calcium chloride as raw material and storing CO₂, this paper used calcium chloride as calcium source, CO₂ carbonization method and vitamin C as crystal form regulator to control the synthesis of vaterite. The products were characterized by X-ray diffractometer, Fourier transform infrared spectrometer, scanning electron microscope, etc. The effects of different concentrations of vitamin C on calcium carbonate crystals and morphology were studied, and the possible formation mechanism of vaterite under the regulation of vitamin C was discussed. The results show that vitamin C has a significant effect on stabilizing the crystalline form of vaterite. When vitamin C is not added, the product is a mixture of vaterite and calcite, while vaterite with a purity of 100% can be obtained by adding 0.1% (mass fraction) vitamin C. Moreover, with the increase of vitamin C concentration, the specific surface area of calcium carbonate increases from 3.63 m²/g to 11.62 m²/g, and the crystal size decreases from 1~3 μm to 0.3~0.6 μm. This study provides a simple, green, and low-cost method to prepare pure vaterite while safely and effectively sequestering CO₂ greenhouse gases.

Key words: vaterite, vitamin C, calcium carbonate, carbon dioxide, crystal form regulator

中图分类号:

TQ132.3⁺2

吴广武, 白蓉, 方虎, 赵成, 陈佩圆. 维生素C调控合成纯球霰石及其形成机理[J]. 硅酸盐通报, 2025, 44(1): 195-201.

WU Guangwu, BAI Rong, FANG Hu, ZHAO Cheng, CHEN Peiyuan. Synthesis of Pure Vaterite Regulated by Vitamin C and Its Formation Mechanism[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(1): 195-201.

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