Perlite is an amorphous aluminum silicate, mainly composed of SiO₂ and Al₂O₃. In this study, we tried to synthesize LTA type zeolite from a perlite as a starting material. It was found that the mechano-chemical treatment (milling process) for perlite as a raw material resulted in the activation of its surface. As a result, fine LTA-type zeolites were preferentially synthesized for perlite with surface activated by mechano-chemical treatments.

We synthesized hydroxyapatite (HAp) by the sol-gel method based on reaction of phosphoric acid and the calcium acetate obtained by dissolving scallop shells in acetic acid. The synthesized HAp was the crystal that is flat and elliptical shape (50–100 nm). On the other hand, HAp from the commercial calcium acetate is large crystal of irregular shape. Mg²⁺, K⁺ and Na⁺ ions were contained in HAp from scallop shell. Effective utilization of waste scallop shell as a high value-added product such as adsorbent or artificial biomaterial can be expected.