The present study investigated the effects of the amino acids asparagine and serine, as additives, on the polymorphic transformation of calcium carbonate (CaCO₃) within the concentration range of 25–100 ppm at 30 °C and pH 12. The structural composition and morphology of the samples prepared with and without additives were evaluated experimentally through X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM) analysis. The XRD results showed that the calcite composition of CaCO₃ samples prepared with asparagine and serine reduced with increasing concentrations of both additives. SEM images showed that CaCO₃ prepared with asparagine and serine had three coexisting crystal forms: cubic-shaped calcite, spherical shaped vaterite, and needle-like aragonite crystals. Moreover, the addition of both additives separately was found to increase the average particle size and Brunauer–Emmett–Teller (BET) specific surface area of the crystals. Higher concentrations of serine and asparagine individually in the crystallization media resulted in a more negative zeta potential. Meanwhile, the thermal behavior, kinetics, and thermodynamics of the CaCO₃ crystals were simultaneously evaluated by means of by thermogravimetric analysis (TGA) coupled with Fourier transform infrared (FTIR) and mass spectrometry (MS). The master plots method combined with the Friedman method revealed that the decomposition of CaCO₃ prepared in pure media followed the contracting volume mechanism, R₃. Positive values of ΔH and ΔG were obtained for CaCO₃ decomposition.

本研究研究了氨基酸天冬酰胺和丝氨酸作为添加剂对25°C至100 ppm浓度范围内的碳酸钙（CaCO ₃）在30°C和pH 12时的多态转化的影响。结构组成和形态通过X射线衍射（XRD），扫描电子显微镜（SEM）和原子力显微镜（AFM）分析，通过实验评估了有无添加剂制备的样品中的一部分。XRD结果表明，用两种天冬酰胺和丝氨酸制备的CaCO ₃样品的方解石组成随两种添加剂浓度的增加而降低。SEM图像显示CaCO ₃用天冬酰胺和丝氨酸制备的晶体具有三种共存的晶体形式：立方方解石，球形v石和针状文石晶体。此外，发现分别添加两种添加剂会增加晶体的平均粒径和Brunauer-Emmett-Teller（BET）比表面积。结晶介质中更高浓度的丝氨酸​​和天冬酰胺分别导致更大的负ζ电势。同时，通过热重分析（TGA）结合傅里叶变换红外（FTIR）和质谱（MS）同时评估了CaCO ₃晶体的热行为，动力学和热力学。主图法与弗里德曼法相结合揭示了CaCO ₃的分解纯介质中的制备遵循收缩体积机理R ₃。对于CaCO ₃分解，获得了ΔH和ΔG的正值。