碳化法制备球霰石碳酸钙微球及形成机理
收稿日期: 2020-09-18
网络出版日期: 2021-03-11
基金资助
广西重点研发计划项目(AB19110043);南宁市科技攻关项目(20185066-1)
Synthesis of vaterite CaCO3 microspheres by carbonization method and its formation mechanism
Received date: 2020-09-18
Online published: 2021-03-11
以CaCl2-NH3-CO2为反应体系,采用分散鼓泡碳化法制备出单分散纯球霰石型碳酸钙微球。用扫描电镜（SEM、FE-SEM）、透射电镜（TEM）、X射线衍射（XRD）等手段对样品进行了表征。考察了反应初始pH、反应终止pH、反应初始温度、二氧化碳气体流速等因素对产物颗粒形貌和粒径的影响,并探讨了球霰石微球的形成机理。实验结果表明,与直接鼓泡碳化法相比,分散鼓泡碳化法形成的二氧化碳气泡数量多、大小均匀,能增大溶液中二氧化碳的过饱和度,有利于制备高纯度的单分散球霰石微球;反应初始温度低、二氧化碳气体流速大,均有利于球霰石的生成。最佳反应条件：反应初始pH为10.0,反应终止pH为7.0,二氧化碳气体流速为1 L/min。
赵历 , 卓民权 , 龚福忠 , 王俊 , 阮恒 , 李开成 , 李艳琳 . 碳化法制备球霰石碳酸钙微球及形成机理[J]. 无机盐工业, 2021 , 53(3) : 38 -43 . DOI: 10.11962/1006-4990.2020-0230
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
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