Coal Waste to Two-Dimensional Materials: Fabrication of α-Fe2O3 Nanosheets and MgO Nanosheets from Brown Coal Fly Ash

Binbin Qian, Tahereh Hosseini, Xiwang Zhang, Yue Liu, Huanting Wang, Lian Zhang

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13 Citations (Scopus)


High-purity 2-D α-Fe2O3 nanosheets and MgO nanosheets have been successfully fabricated with a high extraction yield of 45 and 25 wt %, respectively, from a brown coal fly ash, an otherwise valueless waste. A two-stage counter-current solid-liquid extraction method was first employed under the mild conditions of 25-60 °C and atmospheric pressure to selectively extract Fe3+ and Mg2+, which were then precipitated out separately upon gradual addition of NaOH and subsequent hydrothermal treatment. Finally, 2-D nanosized α-Fe2O3 nanosheet was obtained with a lamellar morphology, while the synthesized Mg(OH)2 precursor undertook an extra multistep calcination to convert into the respective 2-D MgO nanosheet.

Original languageEnglish
Pages (from-to)15982-15987
Number of pages6
JournalACS Sustainable Chemistry & Engineering
Issue number12
Publication statusPublished - 3 Dec 2018


  • Brown coal fly ash
  • Hydrothermal treatment
  • Multistep acid leaching
  • Nanosheet
  • Waste utilization

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