A facile method of transforming FGD gypsum to alpha-CaSO4 center dot 0.5H(2)O whiskers with cetyltrimethylammonium bromide (CTAB) and KCl in glycerol-water solution

作者：Guan, Qingjun; Sun, Wei^*; Hu, Yuehua; Yin, Zhigang; Guan, Changping

来源：Scientific Reports, 2017, 7(1): 7085.

DOI：10.1038/s41598-017-07548-3

• CALCIUM-SULFATE HEMIHYDRATE
• HYDROTHERMAL CRYSTALLIZATION
• CRYSTAL-STRUCTURE
• ION-PAIRS
• MORPHOLOGY
• CASO4
• XPS
• ADSORPTION
• XANTHATE
• ETHYLENE

A facile method to transform flue gas desulfurization gypsum (FGD gypsum) to alpha-calcium sulfate hemihydrate (alpha-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 a-HH. CTAB as the crystal modifier can significantly promoted 1-D growth of a-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 a-HH whiskers from 28.9 to 188.4, which might be attributed to the preferential adsorption of C16H33(CH3)(3)N+ on the negative side facets of a-HH crystal.

• 出版日期2017-8-1