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Trends in Physical Chemistry   Volumes    Volume 17 
Synthesis and characterization of sustainable calcium phosphate nanopowders using eggshell waste
T. H. A. Corrêa, J. N. F. Holanda
Pages: 75 - 82
Number of pages: 8
Trends in Physical Chemistry
Volume 17 

Copyright © 2017 Research Trends. All rights reserved

The food processing industry generates huge amount of chicken eggshell waste per year worldwide. This solid waste is composed mainly of calcite (CaCO3), and is considered to be a waste material of difficult final disposal. In recent years calcium phosphate-based biomaterials have attracted high interest in medical and dental applications for bone grafting and implants. This work focused on the synthesis and characterization of calcium phosphate-based biomaterials via wet chemical precipitation method in different HNO3 concentrations (1 M to 3 M). The chicken eggshell waste was used as an alternative calcium precursor. The resulting powders were calcined at 900 ºC for 2 h, and then characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM/EDS), thermogravimetric analysis (TG), differential thermal analysis (DTA), and Fourier transform infrared spectroscopy (FTIR). The XRD, SEM/EDS, TG, DTA, and FTIR measurement results obtained agree very well. The experimental results showed that it is possible to obtain different calcium phosphate-based nanopowders such as pure β-calcium pyrophosphate (β-CPP) and biphasic calcium phosphate (β-CPP/β-TCP mixture), β-TCP (β-tricalcium phosphate), depending on the HNO3 concentration. The calcium phosphate nanopowders presented average crystallite size in the range from 49.74 nm to 61.47 nm. Such calcium phosphate-based nanopowders produced are highly promising candidates for biomedical field applications.
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