Temperature-dependent synthesis and characterization of Hydroxyapatite (HAP) Sorbent from Periwinkle Shell

O.S. Amuda, R.O. Adetoro, L.A. Azeez, S.A. Adebisi, A.L. Adejumo


Production of hydroxyapatite from biogenic wastes for the adsorption of Contaminants from wastewater has become attractive in recent time. Hydroxyapatite was produced from periwinkle shell (PSHAP) at different calcination temperatures (400, 500 and 600 °C). The periwinkle shell was washed with distilled- deionized water, sundried for 48 h, soaked in 50 % hydrogen peroxide for 24 h; it was washed copiously with distilled-deionized water and dried in an oven at 105 °C. It was then calcined at different temperatures, 400, 500 and 600 °C for 2 h and ground to granules before soaked with 0.26M diammonium hydrogen phosphate solution for 24 h. The calcined PSHAP was oven-dried at 105 °C for 24 h and sieved to 2 mm mesh sizes. PSHAP was characterized using Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) and x-ray Diffraction (XRD) techniques. It was discovered that the PSHAP500 °C with lowest average grain size, percentage crystallinity and intensity had roughest surface suggesting highest adsorptive characteristic. Thus, PSHAP500 may be the most effective adsorbent for the adsorption of contaminants in wastewater.

Keywords— Adsorption, Contaminants, Periwinkle shell, Production, Characterization, Hydroxyapatite.

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