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Recycling Coal Fly Ash for Super-Thermal-Insulating Aerogel Fiber Preparation with Simultaneous Al[sub.2]O[sub.3] Extraction

Molecules (Basel, Switzerland), 2023-12, Vol.28 (24) [Peer Reviewed Journal]

COPYRIGHT 2023 MDPI AG ;ISSN: 1420-3049 ;EISSN: 1420-3049 ;DOI: 10.3390/molecules28247978

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  • Title:
    Recycling Coal Fly Ash for Super-Thermal-Insulating Aerogel Fiber Preparation with Simultaneous Al[sub.2]O[sub.3] Extraction
  • Author: Gu, Jie ; Liu, Lipeng ; Zhu, Rongrong ; Song, Qiqi ; Yu, Hanqing ; Jiang, Pengjie ; Miao, Changqing ; Du, Yuxiang ; Fu, Rui ; Wang, Yaxiong ; Hao, Yan ; Sai, Huazheng
  • Subjects: Cellulose
  • Is Part Of: Molecules (Basel, Switzerland), 2023-12, Vol.28 (24)
  • Description: A large quantity of coal fly ash is generated worldwide from thermal power plants, causing a serious environmental threat owing to disposal and storage problems. In this work, for the first time, coal fly ash is converted into advanced and novel aerogel fibers and high-purity α-Al[sub.2]O[sub.3]. Silica–bacterial cellulose composite aerogel fibers (CAFs) were synthesized using an in situ sol-gel process under ambient pressure drying. Due to the unique “nanoscale interpenetrating network” (IPN) structure, the CAFs showed wonderful mechanical properties with an optimum tensile strength of 5.0 MPa at an ultimate elongation of 5.8%. Furthermore, CAFs with a high porosity (91.8%) and high specific surface area (588.75 m[sup.2]/g) can inherit advanced features, including excellent thermal insulation, stability over a wide temperature range, and hydrophobicity (contact angle of approximately 144°). Additionally, Al[sub.2]O[sub.3] was simultaneously extracted from the coal fly ash to ensure that the coal fly ash was fully exploited. Overall, low-cost woven CAFs fabrics are suitable for wearable applications and offer a great approach to comprehensively use coal fly ash to address environmental threats.
  • Publisher: MDPI AG
  • Language: English
  • Identifier: ISSN: 1420-3049
    EISSN: 1420-3049
    DOI: 10.3390/molecules28247978
  • Source: Geneva Foundation Free Medical Journals at publisher websites
    PubMed Central
    Directory of Open Access Journals
    Alma/SFX Local Collection
    ProQuest Central
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