Para-amino benzoic acid–mediated synthesis of vaterite phase of calcium carbonate

Journal of Chemical Sciences

K Pallavi¹  S A Inchara¹  T N Ramesh1¹ 

[1] Department of Studies and Research in Chemistry and Prof. C N R Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India$$

关键词: Calcium carbonate;    chemical synthesis;    vaterite;    polymorphism;    X-ray diffraction;    morphology.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Calcium carbonate polymorphs were precipitated at room temperature and 80°C by varying the precipitation pH, carbonate source, effect of solvent in presence and absence of structure directing agent such as para-aminobenzoic acid. Calcite phase of calcium carbonate was obtained when sodium hydrogen carbonate and/or sodium carbonate (used as precipitating agents) were added to calcium chloride solution at different pHs in water and/or methanol as solvent in separate experiments. Vaterite phase of calcium carbonate (CaCO3) has been synthesized by mixing calcium chloride and sodium carbonate in presence of para-aminobenzoic acid when water–methanol binary mixture was used as solvent. Vaterite phase of calcium carbonate crystallizes in P63/mmc, while that of calcite phase in R-3mc, respectively. Calcite phase of calcium carbonate exhibits rhombohedral morphology, while vaterite phase has spherical morphology.

【 授权许可】

Unknown