天冬氨酸对碳酸钙形貌和晶型的控制

用DL-天冬氨酸作为碳酸钙结晶的有效调控剂,对所得到的产物进行扫描电子显微镜(SEM),红外吸收光谱(FT-IR),X-射线粉末衍射仪(XRD),热重分析表征,结果显示,当DL-天冬氨酸的浓度为0.005 mol.L-1时,所得碳酸钙是方解石型,但当浓度增大到0.05或0.2 mol.L-1时,得到的却是方解石和球霰石的混合体系。这一结果表明,DL-天冬氨酸在碳酸钙的晶体生长过程中起着十分重要的影响。

Control of DL-Aspartic Acid on Morphology and Structure of Calcium Carbonate

In this paper,DL-Aspartic Acid(DL-Asp) was used as effective modifier to mediate the crystallization of CaCO3.The obtained crystals were characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),Thermogravimetric analysis.As the results have shown,when the concentration of DL-Asp was 0.005 mol·L-1,the CaCO3 particles were calcite,while both calcite and spherical vaterite with various morphologies were produced with the 0.05 mol·L-1 or 0.2 mol·L-1.It indicated that DL-Asp acids played an important role in the process of crystal growth of CaCO3.