| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 236317 | Powder Technology | 2013 | 10 Pages |
•Calcium carbonate was synthesized in the presence of carboxymethylinulin (CMI).•We applied an experimental design to determine the importance of the variables.•Calcium carbonate is obtained with different polymorphs by varying key variables.•The biopolymer concentration is the most effective parameter in CaCO3 synthesis.•Model equations were fitted for the specific surface area and the amount of polymorph.
Calcium carbonate (CaCO3) was crystallized in the presence of the water-soluble biopolymer carboxymethyl inulin (CMI) by a precipitation method under varying experimental conditions. The CaCO3 crystals obtained were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and BET (Brunauer, Emmett and Teller). Calcium carbonate crystals with different polymorphs and morphologies were produced by varying key parameters: the initial concentration of [Ca2 +], the concentration of biopolymer and the feed rate of reactant. An experimental design procedure was applied to determine the significance of the design variables and their interaction with the specific surface area of the crystals and polymorph formation. The experimental design was studied at three levels. The range of the initial concentration of [Ca2 +], the feed rate of reactant and the concentration of biopolymer were 20–100 mmol, 1–5 mL/min and 0–1 g/L, respectively. Based on these experimental conditions, model equations were proposed for the relative fraction of the vaterite polymorph and the specific surface area of the CaCO3 crystals obtained. Statistical analysis revealed that the biopolymer concentration had the greatest effect on the morphology and polymorph of calcium carbonate.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
