以白云石为原料氨碱法制备球霰石及其生成机理研究
收稿日期: 2020-08-11
网络出版日期: 2021-05-12
基金资助
国家自然基金(61102041);辽宁省高校创新团队支撑计划(2013010);国家科技支撑计划(2013BAB09B01);辽宁省教育厅项目(L2013169);辽宁省精细化工协同创新中心资助项目;辽宁省自然基金(201602582);辽宁省自然科学基金指导计划项目:基于涡致振动的宽带压电能量收集结构研究(2019-ZD-0075)
Study on preparation of vaterite from dolomite by ammonia-alkali method and its mechanism
Received date: 2020-08-11
Online published: 2021-05-12
采用仿Solvay氨碱法,以白云石为起始原料,在碱性环境下制备出高球霰石含量的碳酸钙。XRD和SEM表征结果显示,碳化温度为20~40 ℃时的产品为球霰石;40~60 ℃时的产品为方解石;60~90 ℃时的产品为文石。球霰石的高倍SEM发现产品有许多微孔结构,对产品进行比表面积测定为32.653 m2/g,孔径为2.972 nm,为生物分子的装载提供了良好的空间。对球霰石的形成机理分析表明,NH4+-NH3缓冲体系不仅可以增加碳酸钙的过饱和度,还可以改善溶液环境,为球霰石的生长提供了一个良好的溶液环境,溶液中微量的Mg2+起到了促进完好晶型形成的作用。
范天博 , 贾晓辉 , 韩冬雪 , 陈思 , 姜宇 , 胡婷婷 , 郭洪范 , 李莉 , 刘云义 . 以白云石为原料氨碱法制备球霰石及其生成机理研究[J]. 无机盐工业, 2021 , 53(5) : 56 -60 . DOI: 10.11962/1006-4990.2020-0339
Calcium carbonate with high content of vaterite was prepared by imitating Solvay ammonia-alkali method with dolomite as starting material in alkaline environment.The results of XRD and SEM showed that the product with carbonization temperature of 20~40 ℃ was vaterite,40~60 ℃ was calcite and 60~90 ℃ was aragonite.The high magnification SEM of vaterite showed that the product had many microporous structures.The specific surface area of the product was determined to be 32.653 m2/g and the pore size was 2.972 nm.It provides a good space for the loading of biomolecules.The analysis of the formation mechanism of vaterite showed that the NH4+-NH3 buffer system could not only increase the supersaturation of calcium carbonate in the solution,but also improve the solution environment and provide a good solution environment for the growth of vaterite.The trace amount of Mg2+ in the solution played a role in promoting the formation of intact crystal forms.
Key words: dolomite; buffer system; vaterite; calcium carbonate
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