摘要
通过化学分析、SEM显微分析技术结合RosinRamiler概率统计理论从介观层次研究Na5P3O10CaOH2CO2H2O体系纳米CaCO3的合成反应及其成核和生长过程。结果表明Na5P3O10对CaOH2的碳化反应具有抑制作用。随着Na5P3O10的增加体系中CaCO3的成核速率B0逐渐增大。在Na5P3O10=0ppm时CaCO3结晶的生长由长程扩散和凝聚生长控制Na5P3O10=380.4760.9ppm时前期受短程扩散和界面反应控制、后期受长程扩散控制。Na5P3O10的存在抑制了纳米CaCO3的晶体生长。
The nanometer CaCO3 synthesis reaction, nucleation and growth in Na5P3O10-Ca(OH) (2)-CO2 -H2O system were investigated using chemical analysis, SEM and Rosin-Ramuler probability statistics theory. The nucleation rate B-0 was calculated using mass and population balance. The results showed that the Ca(OH)(2) carbonation reaction can be inhibited by Na5P3O10, In the crystallization process, the CaCO3 nucleates rapidly in the initial stage, and then the nucleation rate B-0 decreases gradually. In the system which [ CaCO3] = 0, 380. 4ppm, the tiny CaCO3 nuclei dissolve and the nucleation rate is negative at the finally stage. The CaCO3 nucleation rate B-0 increases with the increase of [Na5P3O10]. The CaCO3 crystal growth experienced the long distance diffusion and agglomeration growth stages when [Na5P3O10] = 0ppm. While [Na5P3O10] = 380. 4, 760. 9ppm, the nanometer CaCO3 nucleus growth is controlled by the short distance diffusion and interface reaction at first, and then it is controlled by the long distance diffusion while CaCO3 nucleus growth according to parabola law( n = 0. 4878, 4. 884). Na5P3O10 is able to inhabit the growth of nanometer CaCO3 crystal.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2001年第6期787-793,共7页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金资助项目(No.59864001)
广西自然科学基金匹配资助项目No.桂科配9912006
