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Synthesis of SiO2–Al2O3 composite aerogel from fly ash: a low-cost and facile approach

  • Original Paper: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)
  • Published:
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Abstract

A low-cost and simple method was proposed to synthesize SiO2–Al2O3 composite aerogel from fly ash by alkali fusion-acid leaching-ambient pressure drying process just in 3 days for the first time. The effect of the leaching solution’s pH value upon micro-structure and properties of the as-prepared SiO2–Al2O3 composite aerogel was intensively studied by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, N2 adsorption-desorption, and Fourier transform infrared spectrometry. The as-formed SiO2–Al2O3 aerogel possessed high specific surface area (abbreviated as SSA) of 800 m2/g when the pH value was controlled at 2.7–3.1 (almost up to 900 m2/g at pH = 2.7). Meanwhile, the aerogel exhibited good thermal stability. After calcination at 900 °C for 2 h, the aerogel still remained an amorphous structure with a SSA of 77.88 m2/g. In addition, the related formation mechanism was also discussed.

Highlights

  • SiO2–Al2O3 aerogels were firstly synthesized from fly ash by a simple method.

  • The composite aerogels possessed higher specific surface area of 897.30 m2/g.

  • The SiO2–Al2O3 aerogels exhibited good thermal stability.

  • The whole low-cost and facile treating process took only 3 days.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. U1810205), the National Basic Research Program of China (No. 2014CB643401).

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Correspondence to Min Guo.

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Shen, M., Jiang, X., Zhang, M. et al. Synthesis of SiO2–Al2O3 composite aerogel from fly ash: a low-cost and facile approach. J Sol-Gel Sci Technol 93, 281–290 (2020). https://doi.org/10.1007/s10971-019-05204-y

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  • DOI: https://doi.org/10.1007/s10971-019-05204-y

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