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Citation: GAO Yanfang, WANG Haishui. Control of Crystalline Polymorphs and Morphologies for Calcium Carbonate with Sodium Citrate[J]. Chinese Journal of Applied Chemistry, ;2015, 32(7): 831-836. doi: 10.11944/j.issn.1000-0518.2015.07.140413 shu

Control of Crystalline Polymorphs and Morphologies for Calcium Carbonate with Sodium Citrate

GAO Yanfang ,
WANG Haishui ^,

1.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Corresponding author: WANG Haishui,
Received Date: 2 December 2014
Available Online: 29 January 2015
Fund Project: 国家自然科学基金资助项目(20873136) (20873136)

Calcium carbonate with various polymorphs and morphologies was prepared by urea hydrolytic method in this study.The crystals were characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis.Uniform needle-like aragonite crystals are obtained in aqueous solution at90℃.In contrast,the addition of sodium citrate results in the formation of novel morphologies of calcite crystals.We also studied the growth of calcium carbonate in the mixed solvent of ethanol/water with sodium citrate as control agent.The results show that sodium citrate also has significant influence on polymorphs and morphologies of calcium carbonate in the ethanol/water mixed solution.Hollow spherical vaterite crystals are obtained in the presence of sodium citrate by changing the volume fraction of ethanol.
- calcium carbonate,
- polymorphs,
- sodium citrate,
- ethanol/water mixed solutions,
- urea
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