Structure and phase analysis of calcium carbonate powder prepared by a simple solution method. Issue 11 (November 2021)

• Record Type: Journal Article
• Authors: Febrida, Renny; Setianto, Setianto; Herda, Ellyza; Cahyanto, Arief; Joni, I Made
• Is Part Of: Heliyon. Volume 7:Issue 11(2021)
• Publication Date: 2021-11
• Subjects: Ca(NO3)2 -- calcium carbonate -- vaterite -- simple solution method; Research -- Periodicals; Medical sciences -- Periodicals; Natural history -- Periodicals; Social sciences -- Periodicals; Earth sciences -- Periodicals; Physical sciences -- Periodicals; 507.2
• DOI: 10.1016/j.heliyon.2021.e08344
• Languages: English
• ISSNs: 2405-8440

Abstract

Abstract: This paper focused on the analysis of the crystal structure and phase transformation of CaCO3 synthesized by simple solution method from 0.5 M Ca(NO3 )2 precursor and 0.5 M Na2 CO3 precipitant at ambient temperature (300 K). The pH of the sample solution at various reaction times of 5, 10, 15, and 30 min were measured and correlated with the supersaturating condition in the presence of the Na2 CO3 which is responsible for vaterite phase formation. The formation of the polymorph structure of obtained CaCO3 powders was characterized using powder X-ray diffraction patterns and their crystal structure and phase transformation were evaluated using the Rietveld refinement method. Moreover, the qualitative analysis of the CaCO3 powders phase was conducted by Fourier Transform Infrared (FTIR) spectroscopy to evaluate the effect of reaction time correlated with their crystal formation. The XRD analysis showed that the vaterite formation was 89 % at a reaction time of 15 min and confirmed also by FTIR that the amount of vaterite increased due to the effect of increasing reaction time. The crystallite size of vaterite was stable at 36 nm at the reaction time of 15 and 30 min. The morphology of the CaCO3 powders obtained from Scanning Electron Microscope (SEM) was spherical with sizes of 2–5 μm. It was highlighted that the supersaturating condition started occurred at a reaction time of 15 min at pH 7.88 which was responsible for vaterite formation took place. It was concluded that the amount of precipitant (Na2 CO3 ) and reaction times play an important role to determine the saturation of carbonate source to allow vaterite phase formation of CaCO3 powders to occur. Highlights: The engineered crystal structure and phase transformation of CaCO3 were achieved at room temperature using Ca(NO3 )2 and Na2 O3 precursor. The vaterite phase formed at 15 min and 30 min reaction times with pH ~ 7.9 shows the spherical morphologies (2–5 µm in diameter). Different reaction times and pH vs. formation and transformation of various CaCO3 phase was demonstrated experimentally. Abstract : Ca(NO3 )2, Calcium carbonate, Vaterite, Simple solution method.