4.6 Review

Recent Advances in Methods for Recovery of Cenospheres from Fly Ash and Their Emerging Applications in Ceramics, Composites, Polymers and Environmental Cleanup

Journal

CRYSTALS
Volume 11, Issue 9, Pages -

Publisher

MDPI
DOI: 10.3390/cryst11091067

Keywords

coal fly ash; ceramics; cenospheres; alumino-silicate; ferrospheres

Funding

  1. Deanship of Scientific Research, King Khalid University (KKU), Abha-Asir, Kingdom of Saudi Arabia [RGP.1/74/42]
  2. National Research Foundation of Korea [4299990314624] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Coal fly ash (CFA) is a major global pollutant produced during the generation of electricity by thermal power plants. CFA contains value-added components such as cenospheres, which are widely utilized in ceramics, fireproofing materials, and wastewater treatment due to their lightweight nature and high mechanical strength.
Coal fly ash (CFA) is a major global pollutant produced by thermal power plants during the generation of electricity. A significant amount of coal fly ash is dumped every year in the near vicinity of the thermal power plants, resulting in the spoilage of agricultural land. CFA has numerous value-added structural elements, such as cenospheres, plerospheres, ferrospheres, and carbon particles. Cenospheres are spherical-shaped solid-filled particles, formed during the combustion of coal in thermal power plants. They are lightweight, have high mechanical strength, and are rich in Al-Si particles. Due to cenospheres' low weight and high mechanical strength, they are widely used as ceramic/nanoceramics material, fireproofing material, and in nanocomposites. They are also used directly, or after functionalization, as an adsorbent for environmental cleanup-especially for the removal of organic and inorganic contaminants from wastewater. By utilizing this waste material as an adsorbent, the whole process becomes economical and eco-friendly. In this review, we have highlighted the latest advances in the cenospheres recovery from fly ash and their application in ceramics and wastewater treatment.

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