PREPARATION AND ION-EXCHANGE PROPERTY OF CATTLE BONE-APATITE

Abstract

Cattle bone-apatite (b-HAp) with low crystallinity was obtained by calcination of cattle bones at 700°C for 1 minute in a fluidized bed furnace. The b-HAp was well crystallized by heat-treatment at 800~1100°C for 24 hours in an electric furnace. The lattice parameters were a=0.942nm and c=0.688nm. Ion-exchange ratios of Ca²⁺ ion for 2.42mM-Pb²⁺ ion were decreased with increasing the heat-treatment temperature of b-HAp up to 1100°C. The value of as-prepared b-HAp by a fluidized bed furnace was 0.13 because of low crystallinity. The saturated exchange amount of Ca²⁺ ion in the b-HAp was 38.7mg·g^-1. Ion-exchange ratios for other metal ions in the b-HAp were 0.12 for for Cu²⁺ and 0.07 for Cd²⁺ and Zn²⁺.