化工进展2017，Vol.36Issue(10)：3786-3793,8.DOI:10.16085/j.issn.1000-6613.2017-0206
在高剪切结晶器中合成文石型纳米碳酸钙
Synthesis of aragonite CaCO3 nanoparticles in a high shear mixer
摘要
Abstract
In the reaction system of Ca(OH)2-CO2,aragonite CaCO3 nanoparticles were prepared with the addition of phosphoric acid and polyacrylamide (PAM) in a high shear mixer (HSM)-aided crystallizer.The structure and morphology of products were characterized by XRD and SEM.The effects of shear rate and the amounts of additives on the polymorph and the size of CaCO3 have been studied.The results indicated that the crystalline purity of aragonite CaCO3 generated in the HSM-aided crystallizer achieved 98.1％ and the average diameter was 50nm.Moreover,the reaction time in the HSM-aided crystallizer was only (1/6)～(1/3) of that in the traditional stirred tank crystallizer.HSM can realize sufficient micro-mixing,and it can control the microenvironment such as the distribution of supersaturation in the reactive crystallization,which is beneficial to the formation of metastable aragonite.The addition of H3PO4 and PAM plays an important role in controlling the polymorph and the size of aragonite CaCO3.H3PO4 can react with Ca(OH)2 to form hydroxyapatite which serves as heterogeneous nuclei.PAM can inhibit the crystal growth in radial direction and stabilize aragonite by preventing agglomeration in the solution.关键词
纳米粒子/高剪切结晶器/文石/多相反应Key words
nanoparticles/HSM-aided crystallizer/aragonite/multiphase reaction分类
化学化工引用本文复制引用
杨超,郭翠梨..在高剪切结晶器中合成文石型纳米碳酸钙[J].化工进展,2017,36(10):3786-3793,8.
