Inorganic Chemicals Industry >
Synthesis of vaterite CaCO3 microspheres by carbonization method and its formation mechanism
Received date: 2020-09-18
Online published: 2021-03-11
The monodispersed pure vaterite microspheres were synthesized by disperse bubbling carbonization using the reaction system of CaCl2-NH3-H2O and characterized by SEM,FE-SEM,TEM and XRD.The effects of several factors such as the initial pH,final pH,initial reaction temperature and flow rate of CO2 gas on the morphology and particle size of products were investigated.The formation mechanism of vaterite microspheres was also discussed.The experiment results demonstrate that much more CO2 bubbles with uniform size are produced by dispersed bubbling carbonization which can increase the supersaturation of CO2 in solution compared with the direct bubbling carbonization.It is helpful to prepare monodisperse vaterite microspheres with high purity.Low initial temperature and high flow rate of CO2 gas also improve the produce of vaterite.The optimum conditions are as follows: initial pH of 10.0,final pH of 7.0,flow rate of CO2 gas of 1 L/min.
Key words: dispersed bubble carbonization; vaterite; synthesis; formation mechanism
Li Zhao , Minquan Zhuo , Fuzhong Gong , Jun Wang , Heng Ruan , Kaicheng Li , Yanlin Li . Synthesis of vaterite CaCO3 microspheres by carbonization method and its formation mechanism[J]. Inorganic Chemicals Industry, 2021 , 53(3) : 38 -43 . DOI: 10.11962/1006-4990.2020-0230
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