Synthesis, Characterization and Mechanism Study of Green Aragonite Crystals from Waste Biomaterials as Calcium Supplement

Lulit Habte, Mohd Danish Khan, Natnael Shiferaw, Adeeba Farooq, Mee-hye Lee, Seok-ho Jung and Ji Whan Ahn
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Lulit Habte: Resources Recycling Department, University of Science and Technology (UST), 217, Gajeong-ro, Yuseong-gu, Daejeon-34113, Korea
Mohd Danish Khan: Resources Recycling Department, University of Science and Technology (UST), 217, Gajeong-ro, Yuseong-gu, Daejeon-34113, Korea
Natnael Shiferaw: Korea Research Institute on Climate Change, 11, Subyeongongwon-gil, Chuncheon-si 24239, Korea
Adeeba Farooq: Mechanical Engineering Department, ABES Institute of Technology, Campus 2, NH 24, Ghaziabad-201009, India
Mee-hye Lee: Department of Earth and Environmental Sciences, Korea University, Seoul-02841, Korea
Seok-ho Jung: Department of Earth and Environmental Sciences, Korea University, Seoul-02841, Korea
Ji Whan Ahn: Center for Carbon Mineralization, Mineral Resources Research Division, Korea Institute of Geosciences and Mineral Resources (KIGAM), 124 Gwahak-ro, Yuseong-gu, Daejeon-34132, Korea

Sustainability, 2020, vol. 12, issue 12, 1-10

Abstract: 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 °C. 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 µm) and specific surface area (2–18 m 2 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.

Keywords: aragonite; carbonation; bivalve seashell; eggshell; precipitation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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