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Green and low-cost synthesis of monocalcium phosphate by using recrystallization of triple superphosphate derived from waste mollusk shells
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  • Somkiat Seesanong,
  • Chaowared Seangarun,
  • Banjong Boonchom,
  • Chuchai Sronsri,
  • Nongnuch Laohavisuti,
  • Nattaya Montri,
  • Somphob Thompho,
  • Wimonmat Boonmee,
  • Pesak Rungrojchaipon
Somkiat Seesanong
King Mongkut's Institute of Technology Ladkrabang
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Chaowared Seangarun
King Mongkut's Institute of Technology Ladkrabang
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Banjong Boonchom
King Mongkut's Institute of Technology Ladkrabang

Corresponding Author:[email protected]

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Chuchai Sronsri
King Mongkut's Institute of Technology Ladkrabang
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Nongnuch Laohavisuti
King Mongkut's Institute of Technology Ladkrabang
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Nattaya Montri
King Mongkut's Institute of Technology Ladkrabang
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Somphob Thompho
King Mongkut's Institute of Technology Ladkrabang
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Wimonmat Boonmee
King Mongkut's Institute of Technology Ladkrabang
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Pesak Rungrojchaipon
King Mongkut's Institute of Technology Ladkrabang
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Abstract

High consumption of mollusk shells generates many waste mollusk shells. To reduce and utilize these wastes, they can be cleaned and milled to produce calcium carbonate (CaCO3) powders, which can be further used as raw material for producing valuable products. This research presents a simple, cheap, and environmentally friendly preparation of calcium phosphates by using waste mollusk shells as a renewable source. All synthesized calcium phosphate samples were characterized and confirmed by X-ray fluorescence, X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and thermal analysis. The addition of phosphoric acid to mollusk-derived CaCO3 generated triple superphosphate (TSP), which was consisting of two or more calcium phosphate compounds. After the TSP powder was dissolved in water, non-soluble powders were obtained and found to be dicalcium phosphate dihydrate (DCPD, CaHPO4•2H2O). After removing non-soluble compounds and then the self-evaporating process of the solution fraction to dryness, the recrystallized product was investigated and confirmed as monocalcium phosphate monohydrate (MCPM, Ca(H2PO4)2•H2O). This recrystallization process produced highly purified Ca(H2PO4)2•H2O with high solubility and phosphorus content that can be used as an effective fertilizer. The green and low-cost preparation of calcium phosphates proposed in this research will be valuable to reduce waste mollusk shells by reforming them into value-added products. This information points out the viewpoint of a zero-waste operation for obtaining sustainable development, which could be selected as an effective technique for waste management and recycling.