Chlorapatite Derived From Fish Scales

Materials
Luyara de Almeida CavalcanteJean Carlos Silva Andrade

Abstract

The present work demonstrates the production of chlorapatite (ClAp) through thermal decomposition of chemically treated fish scales, originating from an Amazon fish species (Arapaima gigas). The scales were treated with hydrochloric acid (HCl) solution for deproteinization. Afterwards, the solution was neutralized by sodium hydroxide (NaOH) treatment to obtain an apatite-rich slurry. The heat treatment was carried out at different temperatures including 600 °C, 800 °C, and 1000 °C. The powders obtained were characterized through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM). The XRD analysis and FTIR spectra confirmed the incorporation of chlorine into the apatite structure. The FTIR results showed absorption bands relative to the OH-, PO43- functional groups which are a characteristic of chlorapatite; moreover, the intensity of the OH-Cl elongation could be observed. Chlorapatite Ca5(PO4)3Cl, NaCl, and NaCaPO4 phases were identified, achieving up to 87.4 wt% for ClAp. From the SEM observations, the ClAp obtained consisted of slightly larger grains and more crystalline with increasing temperature with observed grains ra...Continue Reading

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Citations

Jul 25, 2021·Polymers·Francesca Lionetto, Carola Esposito Corcione

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Methods Mentioned

BETA
Scanning Electron Microscopy
scanning
X-ray
thermal decomposition

Software Mentioned

XPert HighScore Plus
ClAp
General Structure Analysis System ( GSAS )

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