Synthesis, characterization and mechanism study of green aragonite crystals fromwaste biomaterials as calcium supplement

Lulit Habte, Mohd Danish Khan, Natnael Shiferaw, Adeeba Farooq, Mee hye Lee, Seok ho Jung, Ji Whan Ahn

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


In present work, environmentally benign green aragonite crystals were synthesized from waste chicken eggshells and bivalve seashells through a simple and low-cost wet carbonation method. This method involves a constant stirring of calcium oxide slurry and magnesium chloride suspension in aqueous solution with constraint carbon dioxide injection at 80 ffiC. The physicochemical properties of the synthesized aragonite were further compared with the aragonite synthesized from commercial calcium oxide. The morphological analysis, such as acicular shape and optimum aspect ratio (~21), were confirmed by scanning electron microscopy. The average crystal size (10-30 m) and specific surface area (2-18 m2 g-1) were determined by particle size and Brunauer-Emmett-Teller analysis, respectively. Moreover, a schematic crystal growth mechanism was proposed to demonstrate the genesis and progression of aragonite crystal. Green aragonite can bridge the void for numerous applications and holds the potential for the commercial-scale synthesis with eggshells and bivalve seashells as low-cost precursors.

Original languageEnglish
Article number5062
JournalSustainability (Switzerland)
Issue number12
Publication statusPublished - 2020 Jun 1


  • Aragonite
  • Bivalve seashell
  • Carbonation
  • Eggshell
  • Precipitation

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Renewable Energy, Sustainability and the Environment
  • Environmental Science (miscellaneous)
  • Energy Engineering and Power Technology
  • Management, Monitoring, Policy and Law


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