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Abstract
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Bio-waste management and recovering functional products in marine waste is an effective to do. One source of waste from the marine sector is cuttlefish shell. Actually, this waste has been used for animal feed but in small scale. Others are still as waste and cause pollution if not handled properly. Cuttlefish shell waste contains abundant calcium carbonate which is the basic ingredient for making hydroxyapatite (HA). The waste is transformed into valuable materials while paying attention of sustainability and circular economy. HA is one of the main compounds for bone. HA demand in the market is very high, especially in health sector. This paper aimed to synthesis HA from cuttlefish shell waste and coral as comparison. Synthesis HA was used microwave hydrothermal method. The cuttlefish shell waste and coral were obtained from the pet market in Yogyakarta. They were crushed and calcined to temperature of 900oC to obtain CaO compounds. Then, CaO was synthesized by microwave hydrothermal together with diammonium phosphate and distilled water to obtain HA powder. Synthetic HA was characterized by FTIR, XRD, SEM, and EDX. The characterization results indicated that Ca/P ratio of HA cuttlefish shell waste and coral are 1.7 and 1.87 respectively. Moreover, coral HA has higher crystallinity than cuttlefish shell waste with value 48% and 42% for cuttlefish shell HA. The conclusion is that both cuttlefish shell waste and coral are sources of raw materials to produce HA. HA from cuttlefish shells waste is close to human bone but coral near to Tetracalcium Phosphate.
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