Removal of heavy metal contamination in water is an important subject on account of environmental regulation and maintenance of public health. Hydroxyapatite is a unique substance because of its high capacity of heavy metal ion exchange or absorption [1-5]. However, the synthesized materials are very expensive because of their high quality as they are mostly produced for clinical use. Recently, Ozawa et al. have reported the possibility of fish bone waste as an inexpensive source of hydroxyapatite ceramics [6]. In this letter, the removal of manganese (Mn) using fish bone waste hydroxyapatite is reported. We compare the raw and heat-treated powders of fish bone in a removal procedure involving aqueous manganese.
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