文献类型：期刊文献

英文题名：Effects of metal ions on the morphology of calcium sulfate hemihydrate whiskers by hydrothermal method

作者：Liu, Tianjie[1];Fan, Hao[1];Xu, Yanxia[1];Song, Xingfu[1];Yu, Jianguo[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China

年份：2017

卷号：11

期号：4

起止页码：545

外文期刊名：FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING

收录：;EI(收录号：20173904220461);WOS:【SCI-EXPANDED(收录号:WOS:000419532300006)】；

基金：The authors thank the National High Technology Research and Development Program of China (No. 2011AA06A107) and Qinghai Science and Technology project (2015-GX-Q19A) for financial support.

语种：英文

外文关键词：metal ions; morphology; calcium sulfate hemihydrate whiskers; hydrothermal method; selective adsorption

摘要：The effects of Na+, Mg2+, Al3+ and Fe3+ ion concentrations on the crystal morphology of calcium sulfate hemihydrate whiskers formed via a hydrothermal method have been studied. In the presence of Al3+ concentrations higher than 1 x 10(-3) mol/L the whiskers were significantly shorter and thicker and the presence of Mg2+ and Fe3+ resulted in shorter whiskers. The presence of Na+ did not affect the morphology of the whiskers. Through elemental analysis, it was determined that Mg2+ and Al3+ were selectively adsorbed on the surfaces of the crystals, whereas Fe3+ underwent a hydrolysis reaction to form a brown precipitate which decreased the ion concentration in the solution. These results indicate that in raw materials used for the industrial preparation of calcium sulfate whiskers, Al3+ and Fe3+ should be removed and the Mg2+ concentration should be less than 8 x 10(-3) mol/L in order to obtain pure whiskers with high aspect ratios.