Abstract
In the present study, hydroxyapatite (HAp) was synthesized from waste chicken eggshells using wet chemical precipitation method. The entire process involved the conversion of raw chicken eggshells to calcined form to finally HAp via precipitation. The functional groups in the synthesized sample were determined by Fourier Transform Infrared Spectroscopy (FTIR) analysis. HAp was also characterized using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) to describe its morphology and elemental composition, respectively. The potential of HAp for cyanide removal in aqueous solution was further investigated via batch sorption with 3 × 2 factorial experimental design to determine the effects of initial cyanide concentration and HAp dosage. The highest percent removal was 50.31% attained at 64 mg L−1 cyanide concentration and 0.3 g HAp dosage after a 30-min contact time with solution pH maintained within the range 8.5–9.5. Two-way ANOVA results show significant main and interaction effects of the varied factors to the cyanide removal efficiency at 95% confidence level.
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