Preparation and Properties of Al2O3-SiO2 Aerogel from Coal Gangue

Abstract

Abstract: Although coal gangue as solid waste is used in electricity generation, coalmine backfilling and building materials, its utilization rate is still not high. How to improve the high-value utilization of coal gangue has become a research hotspot. In this paper, Al₂O₃-SiO₂ aerogel powder was synthesized by one-step acid leaching followed by sol-gel method and ambient pressure drying from coal gangue. Ultrasonic was exerted in the process of solvent replacement and modification. The structure and performance of Al₂O₃-SiO₂ aerogel powder were characterized by means of BET, XRD, SEM, FT-IR, TG-DSC and contact angle measurement. The results show that the reaction rate is accelerated by ultrasonic and the preparation cycle is shortened. Al₂O₃-SiO₂ aerogel is a mesoporous material with three-dimensional network structure of nano. Al₂O₃-SiO₂ aerogel has a minimum bulk density of 0.120 g/cm³ and a specific surface area of 635 m²/g, its shrinkage at high temperature is lower than that of SiO₂ aerogel prepared from sodium silicate, Al₂O₃-SiO₂ aerogel also shows high hydrophobicity.

Key words: coal gangue, activation, ultrasonic assist, Al₂O₃-SiO₂ aerogel, high temperature resistance, hydrophobicity

CLC Number:

TB321

XIA Chenkang, LI Shumin, HU Bo, HAO Mingyuan, CHEN Huanle, SHANG Yang, LIU Weihai, ZHANG Xinyuan, WU Zemin, MIAO Yang, GAO Feng. Preparation and Properties of Al₂O₃-SiO₂ Aerogel from Coal Gangue[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 607-615.

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Preparation and Properties of Al₂O₃-SiO₂ Aerogel from Coal Gangue

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