Synthesis and characterization of hydroxyapatite particles from waste fish bone and statistical modelling of hexavalent chromium removal using synthetic wastewater

• Main Authors: Pawar, Suman, Theodore, Thomas
• Format: Conference Proceeding
• Language: English
• Subjects: Adsorbents; Adsorption; Biomedical materials; Bones; Crushing; Fish; Fourier transforms; Hexavalent chromium; Hydroxyapatite; Infrared spectroscopy; Ion concentration; Process parameters; Response surface methodology; Spectrum analysis; Statistical models; Surface chemistry; Wastewater treatment
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0131837

The present work reported the preparation of hydroxyapatite [HA] and adsorption of Cr (VI) on synthesized HA. In relation to this development of HA, become novel study due to simplicity in production. Hence in this paper HA is produced from waste fish bones [FB]. The bones are washed with water and dried in the presence of sunlight. The dried bones were crushed into small pieces. The crushed bones were calcined at 800 °C for 3 h, to obtain the fish bone hydroxyapatite [FBHA] product. The FBHA was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive spectroscopy. The particle surface area of FBHA was estimated by BET technique. Further, the adsorption of Cr (VI) ions from wastewater solution onto FBHA was examined. The batch adsorption tests were performed and the influence of various parameters such as pH, adsorbent dosage, initial Cr (VI) concentration, and contact time of the solution were optimized using response surface methodology (RSM). The optimum pH, adsorbent dose, initial chromium (VI) concentration, and contact time were found to be 6, 0.2 g, 200 mg L−1, and 15 min, respectively. Cr (VI) removal was 87.27 % at the optimum combination of process parameters. The hexavalent chromium removal increased with increase in initial Cr (VI) ion concentration, adsorbent dose, and time of contact.