Microwave-assisted synthesis of nanorod hydroxyapatite from eggshells

a microwave-assisted technique can be used as a green energy and to save time for synthesis of HA. Microwave irradiation is a simple method for the synthesis of HA due to its high reaction rate, time savings, rapid heating, and green energy 15]. In this process, the size and shape of HA molecules can be controlled by the synthesis parameters 15]. The purpose of this work is to prepare nanorod HA by microwave-assisted synthesis with the use of phosphoric acid, with eggshells serving as the calcium source. Furthermore, HA is a potential material for metal ion adsorption. Abstract: Nanorod hydroxyapatite (HA) was synthesised from eggshells by using a microwave-assisted technique. With eggshells and phosphoric acid as precursors, the reaction was carried out in a microwave with an irradiation power of 800 W for 45 minutes. The effects of Ca/P molar ratios and the power of microwaves were investigated. The obtained hydroxyapatite was characterised by X-ray diffraction (XRD), scanning electron microscope (SEM), and infrared spectroscopy (IR). The nanorod-like HA samples were 20-40 nm in diameter and 130-180 nm in length.