化工进展2018，Vol.37Issue(4)：1536-1543,8.DOI:10.16085/j.issn.1000-6613.2017-1194
金属离子对水热法制备半水硫酸钙晶须的形貌及粒径的影响
Effect of metal ions on crystal morphology and size of calcium sulfate hemihydratewhiskers preparated by hydrothermal method
摘要
Abstract
Hydrothermal method was applied in the preparation of the calcium sulfate hemihydrate whiskers using dihydrate gypsum as the raw material. The optimum conditions were reaction temperature 120℃,the slurry mass fraction 2%,the reaction time 2h,and the stirring rate 200r/min by the single factor experiment. Then,the whiskers with needle-like,high spersivity,the average diameter of 2.4μm and the aspect ratio of 103.9 were obtained. Simultaneously,the effect of some metal ions such as K+,Mg2+,Cu2+,Fe3+,Al3+on the crystal morphology and size of the whiskers prepared under the optimum conditions was investigated. The results showed that the crystal morphology and size of the whiskersw as affected significantly by metal ions. It was found that Mg2+and Cu2+ions with low concentration facilitated the preparation of the whiskers with small average diameter and high aspect ratio. The Al3+and Fe3+ions had a strong inhibition effect on the growth of the whiskers. Especially,the Al3+and Fe3+ions with low concentration obviously changed the crystal morphology and decreased the aspect ratio of the whiskers. Except in the case of K+ion,with increasing the metal ion concentration,the average diameter increased; the aspect ratio decreased,and the morphology of the whiskers transformed from needle-like to rod-like shape with some of the particles agglomerate phenomena together. Finally,the mechanism of action by metal ions was discussed.关键词
水热/制备/半水硫酸钙晶须/优化/金属离子Key words
hydrothermal/preparation/calcium sulfate hemihydrate whiskers/optimization/metal ions分类
化学化工引用本文复制引用
吴峰,吴硕琮,马家玉,吴再坤,覃远航,王为国,汪铁林,王存文..金属离子对水热法制备半水硫酸钙晶须的形貌及粒径的影响[J].化工进展,2018,37(4):1536-1543,8.基金项目
国家自然科学基金(51274153)、湖北省自然科学基金重点项目(2011CDA120)及武汉工程大学大学生校长基金(2016002)项目. （51274153）
