一种在甘油-水溶液中利用十六烷基三甲基溴化铵（CTAB）和 KCl 将脱硫石膏转化为α-CaSO·0.5HO 晶须的简便方法。

A facile method of transforming FGD gypsum to α-CaSO·0.5HO whiskers with cetyltrimethylammonium bromide (CTAB) and KCl in glycerol-water solution.

机构信息

School of Mineral Processing and Bioengineering, Central South University, Changsha, 410083, China.

出版信息

Sci Rep. 2017 Aug 1;7(1):7085. doi: 10.1038/s41598-017-07548-3.

DOI:10.1038/s41598-017-07548-3

PMID:28765604

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5539100/

Abstract

A facile method to transform flue gas desulfurization gypsum (FGD gypsum) to α- calcium sulfate hemihydrate (α-HH) whiskers with high aspect ratios mediated by cetyltrimethylammonium bromide (CTAB) and KCl in glycerol-water solutions was studied. Addition of KCl facilitated the dissolution of calcium sulfate dihydrate (DH) and created a much higher supersaturation, which could come into being a larger driving force for the phase transformation from DH to α-HH. CTAB as the crystal modifier can significantly promoted 1-D growth of α-HH whiskers along the c axis and the presence of 0.25% CTAB (by weight of FGD gypsum) resulted in the increase of the average aspect ratio of α-HH whiskers from 28.9 to 188.4, which might be attributed to the preferential adsorption of CH(CH)N on the negative side facets of α-HH crystal.

摘要

研究了在甘油-水溶液中，十六烷基三甲基溴化铵（CTAB）和 KCl 介导的简便方法，将烟气脱硫石膏（FGD 石膏）转化为具有高纵横比的α-半水硫酸钙（α-HH）晶须。添加 KCl 促进了二水硫酸钙（DH）的溶解，并产生了更高的过饱和度，这为从 DH 向 α-HH 的相转变提供了更大的驱动力。CTAB 作为晶型改性剂，可以显著促进α-HH 晶须沿 c 轴的一维生长，而添加 0.25%CTAB（以 FGD 石膏的重量计）使α-HH 晶须的平均纵横比从 28.9 增加到 188.4，这可能归因于 CH(CH)N 在α-HH 晶体的负侧面对的优先吸附。