REMOVAL AND SEPARATION OF HEAVY METAL IONS IN AQUEOUS SOLUTION BY HYDROXYAPATITE PREPARED FROM FISH SCALES

Abstract

Removal and separation of lead(II) and cadmium(II) and those of chromium(III), nickel(II), and zinc(II) in aqueous solution were examined by use of hydroxyapatite (n-HAp) prepared from fish scales. These removal reactions proceeded quickly, and lead(II) and chromium(III) could be removed well. And the possibility of separating lead ion from cadmium ion in aqueous solution was confirmed. As the n-HAp can be supplied at a low price by using scales of fishery waste, it is expected to be available for practical use to remove and recover some toxic heavy metal ions from industrial waste.