(215m) Experimental Study On Iodine Adsorption By Silve-Exchanged Mordenite

Iodine-129 is one of several radioactive iodine isotopes formed in fission reactions. Due to its extremely long half-life of about 16×10⁶ years, effective removal and immobilization of iodine-129 species from spent nuclear fuels represents one of the critical barriers to nuclear waste management. The state-of-the-art of iodine capture from spent fuel reprocessing off-gases is adsorption by silver-exchanged mordenite. Development of sorbents and sorption processes for off-gas treatment requires advanced predictive modeling tools for simulating dynamic adsorption processes. Development of modeling tools further requires fundamental experimental adsorption equilibrium and kinetic data. In this work, a continuous flow adsorption system was developed for single-pellet gas adsorption studies. Experiments are in progress to gather equilibrium and kinetics data for iodine adsorption on silver-exchanged mordenite. Experiments are being conducted at 150-200 ^oC and at varying iodine concentration below 100ppm. In this presentation, design of the experiment and preliminary adsorption equilibrium and kinetics results will be discussed.