Inorganic Chemicals Industry ›› 2023, Vol. 55 ›› Issue (12): 74-81.doi: 10.19964/j.issn.1006-4990.2023-0047

• Research & Development • Previous Articles     Next Articles

Hydrothermal synthesis of basic magnesium sulfate whiskers from magnesium hydroxide and magnesium sulfate heptahydrate

JIANG Demin1(), LI Shunmei1, Li Qingqing1, Chen Yuxin1, LIU Daijun2   

  1. 1. Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir,Chongqing Three Gorges University,Chongqing 404100,China
    2. School of Chemical Engineering,Sichuan University,Chengdu 6100653,China
  • Received:2023-02-01 Online:2023-12-10 Published:2023-12-14

Abstract:

To obtain the high-quality basic magnesium sulfate whiskers,magnesium hydroxide and magnesium sulfate heptahydrate were used to prepare basic magnesium sulfate whiskers with the hydrothermal method.The influences of hydrothermal parameters on whisker morphology were investigated,which included the molar ratio of magnesium sulfate heptahydrate to magnesium hydroxide,hydrothermal time,stirring speed,addition amount of magnesium sulfate heptahydrate,and hydrothermal temperature.The whisker products were characterized by the various instruments of X-ray diffractometry(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),selected area electron diffraction(SAED),and Fourier-transform infrared spectrum(FT-IR).The results showed that the optimized process parameters were as following:the molar ratio of magnesium sulfate heptahydrate to magnesium hydroxide was 3∶1,hydrothermal time was 2 h,stirring speed was 400 r/min,addition amount of magnesium sulfate heptahydrate was 4.93 g,hydrothermal temperature was 180 ℃ and the reaction medium of water was 80 mL.The products synthesized at the optimized conditions were mainly fibrous whiskers.The aspect ratio of fibrous whisker was more than 160 with the diameter of 300~500 nm and the length of 80~100 µm.Therefore,the optimization of the process parameters could effectively improve the dispersion and aspect ratio of basic magnesium sulfate whiskers.

Key words: basic magnesium sulfate whisker, hydrothermal method, morphology, magnesium hydroxide, magnesium sulfate heptahydrate

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