ADSORPTION OF SILICIC ACID ON THORIA-DETERMINED BY INFRARED SPECTROSCOPY

摘要

Adsorption isotherms were obtained for silica acid adsorbed on thoria from aqueous solutions at 16°, 49.6°, and 71.5° C. Typical Langmuir isotherms were obtained from which the equilibrium constants could be calculi-ted. Additional equilibrium constants were obtained by equilibrating in an autoclave from which flash samples were removed up to temperatures of 280°C. The amount of silica adsorbed was determined from infrared spectra of the adsorbate on the surface of the thoria. It was found that the silica acid adsorbed with a positive enthalpy and entropy of adsorption.