Synthesis of colored calcium carbonate and its color

DOI Web Site 参考文献11件
  • KOGO Mitsuaki
    Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University
  • UZAWA Narumi
    Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University
  • NASU Arisa
    Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University
  • UMEGAKI Tetsuo
    Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University
  • KOJIMA Yoshiyuki
    Department of Materials and Applied Chemistry, Faculty of Science and Engineering, Nihon University

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<p>The synthesis of calcium carbonate (CaCO3) was conducted under the presence of food dye. A food dye was added into Ca(OH)2 suspension with citric acid aqueous solution, and CaCO3 was synthesized by reacting prepared Ca(OH)2 suspension with CO2 gas. Sunset yellow FCF and brilliant blue FCF were selected for food coloring. All products were calcite which is a stable phase. When the amount of citric acid aqueous solution added was 0–8 cm3, the crystallinity of calcite decreased with increasing the amount added by X-ray diffraction (XRD) patterns. Also, the crystal shapes using scanning electron microscope were observed. At the amount of citric acid aqueous solution 0, 5, and 8 cm3, the shapes of obtained calcite were fine calcite particles, elliptical particles, dumbbell-shaped, and rod-shaped particles. Various forms of calcite were synthesized by changing the amount of citric acid aqueous solution. In addition, the obtained samples were colored bright orange and blue. These products were called colored CaCO3 and colored by adsorption of dye on CaCO3 particles and incorporating dyes into CaCO3 crystals. It was possible to obtain various shapes CaCO3 colored by synthesizing under the presence of dye in the Ca(OH)2–CO2–H2O reaction system.</p>

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