Abstract
Fish scales are natural sources of collagen and hydroxyapatite, yet are typically considered waste. In this study, fish scale powder obtained from Tilapia fish (Oreochromis mossambicus) was used to synthesize scaffolds by freeze casting for the removal of lead ions from wastewater. The mineral hydroxyapatite was confirmed by x-ray diffraction. Scaffolds with a well-aligned lamellar microstructure (10–80-μm channel widths) and proper mechanical properties under compression were synthesized by controlling the solid loading, cooling rate, and sintering temperature. The maximum adsorption capacities (q max) were 208.3 mg/g and 344.8 mg/g in pH = 5 and pH = 2.2 solutions, respectively. More than 99.9% of the lead ion was removed after 20 min. The results show that fish-scale-derived hydroxyapatite scaffolds are promising for heavy metal ion removal and wastewater treatments.
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This study is supported by the Ministry of Science and Technology, Taiwan (MOST103-2221-E-007-034-MY3).
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Liu, WK., Liaw, BS., Chang, HK. et al. From Waste to Health: Synthesis of Hydroxyapatite Scaffolds From Fish Scales for Lead Ion Removal. JOM 69, 713–718 (2017). https://doi.org/10.1007/s11837-017-2270-5
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DOI: https://doi.org/10.1007/s11837-017-2270-5