水热温度对硫酸铝水解产物相结构及微观形貌的影响

发布时间：2018-03-20 07:02

  本文选题：硫酸铝　切入点：水解　出处：《环境工程学报》2017年05期 　论文类型：期刊论文

【摘要】：采用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、热重分析(TGA)和扫描电子显微镜(SEM)综合分析水热温度对硫酸铝水解产物物相的影响及其反应机理,同时通过低温氮气吸附法(BET)测定产物孔结构。结果表明:水热温度t≤96℃时,Al_2(SO_4)_3水解产物为无规则团聚的非晶态氢氧化铝;t≥120℃,氢氧化铝不稳定,存在再溶解-再沉淀过程,非晶态氢氧化铝向NaAl_3(SO_4)_2(OH)_6转化;t=180℃时,通过奥氏熟化,Al_2(SO_4)_3水解产物转变为斜方六面体NaAl_3(SO_4)_2(OH)_6,择优向(113)面生长。BET结果表明,水热温度t≤96℃时,产物孔径分布不均匀,t≥120℃时,产物孔径分布窄而均匀,且t=120℃时,产物比表面积最大为91.99 m~2·g~(-1)。
[Abstract]:The effect of hydrothermal temperature on the phase of hydrolysate of aluminum sulfate and its reaction mechanism were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscope (SEM). At the same time, the pore structure of the product was determined by low temperature nitrogen adsorption method. The results showed that when the hydrothermal temperature was t 鈮，

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