Removal of Pb2+ and Cd2+ ions by hydroxyapatite separated from scales of fish
Aoki Kaoru; Nakata Hokuto; Matsumoto Kouta; Sawa Hiroyuki
Abstract:Hydroxyapatite separated from fish scales by treating them with hot potassium hydroxide solution (n-HAp) were applied to the removal of Pb2+ and Cd2+ ions in aqueous solutions at several temperatures. The removal ratios of the ions in aqueous solutions were as well as those of synthetic hydroxyapatite. Hydroxyapatite powder separated from fish scales can be supplied at low price and of practical use for removal of such toxic heavy metal ions as Pb2+ and Cd2+ in industrial waste. Key Words:scales of fish, hydroxyapatite, removal of toxic ions, heavy ions, lead, cadmium