Characterization of nano-hydroxyapatite synthesized from eggshells for absorption of heavy metals

This paper presents the synthesis of nano-hydroxyapatite using the deposition process on eggshells as a cost-effective starting material. This study investigates the potential of nano-hydroxyapatite as an effective adsorbent for heavy metals. Various analytical techniques, including X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), Fourier transform infrared (FTIR), surface area measurement (BET), and scanning electron microscopy (SEM), were used to characterize its composition and microstructure. The main objective of this study is to evaluate the suitability of synthesized hydroxyapatite as a heavy metal adsorbent in aqueous solutions. The attained results showed that hydroxyapatite with particle size in the range of nanometers and a specific area of 150 m2/g, and the necessary properties for absorption, was successfully processed. The results showed that the prepared samples had a uniform mesopore distribution between 2 to 3 nm and an explicit size of 9 nm.