摘要
在碳酸氢钙(Ca(HCO3)2)的分解过程中,通过温度和聚乙二醇(PEG)成功地控制了碳酸钙(CaCO3)的晶型和形貌。用XRD和SEM对制得的CaCO3的晶体类型和颗粒形貌进行表征,结果显示在不添加PEG的情况下,可以观察到菱面体方解石、层状球霰石、棒状及针状的文石。在所有样品中主晶相都是方解石,其含量随温度升高而增多,而球霰石和文石则随温度升高而减少。考察了分解温度为80℃时,添加不同分子量的PEG对CaCO3的晶体类型和颗粒形貌的影响。当反应体系中加入PEG-2000时,方解石仍是主要的晶型,但含量明显减少,文石相增加到39.2%;而加入PEG-6000时,方解石相明显减少,文石相增加到79.3%。这些结果表明:在Ca(HCO3)2的分解过程中,温度和PEG可以调控CaCO3的晶型和形貌。
During the decomposition of Ca（HCO3）2 solution, the polymorphs and morphologies of CaCO3 particles were successfully controlled by temperature and polyethylene glycol （PEG）. XRD and SEM were employed for the characterization of polymorphs and morphologies of CaCO3 particles in the present work. XRD results revealed that rhombohedra calcite, lamellar vaterite and rodor needle-like aragonite co-exist in the product at absence of PEG. Calcite is the major phase in all temperatures and the amount Of calcite increases with reaction temperature, while the amounts of vaterite and aragonite decrease with temperature. The effect of PEG with different molecular weight on the polymorphs and morphologies of CaCO3 particles at the temperature of 80℃ was also investigated in this work. When PEG-2000 was added in the reaction system, although calcite crystal is still the main phase, its amount significantly decreased, while aragonite increased to 39.2wt%. When PEG-6000 was added, aragonite becomes the main crystalline phase and its amount increases to 79.3wt%. These results indicate that temperature and PEG can regulate the polymorphs and morphologies of CaCO3 particles.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2015年第8期2409-2413,共5页
Bulletin of the Chinese Ceramic Society
基金
绿色轻工材料湖北省重点实验室开放基金([2013]-面上-8)
湖北省教育厅科学技术研究计划重点项目(D20151405)
