Abstract
Desorption of Cd adsorbed on Montmorillonite (Mt), Pyrophyllite (Py), Hydroalminum montmorillonite (HyA-Mt) is observed by means of QMS. The desorption peak temperatures of Cd are 730°C from Mt, 820°C from Py and beyond 900°C from HyA Mt, respectively. Cadmium absorbs on the side surface of the octahedral sheet for Mt and Py. However the desorption peak temperature of Cd from Py is higher than Mt because of the structure of Py, which is more thermaly stable than the structure of Mt. For HyA-Mt, Cd adsorbs mainly on the Al(OH)3 layer. Desorption peak temperature of Cd from Al(OH)3 layer is higher than that from the side surface of the crystal.
