In this study, we have investigated the iodine retention behavior of silver zeolite sorbents under a variety of conditions. First, a preliminary study was achieved in liquid phase in order to determine: (i) the main kinetic and thermodynamic characteristics pertaining to the adsorption behavior; (ii) the influence of some zeolitic parameters (nature of the framework, silver content, 2 preparation method…) on the adsorption capacities. Thanks to the on-line monitoring of gas-phase I 2 concentrations by UV-Vis spectroscopy, the iodine dynamic adsorption/desorption behavior of some selected sorbents was then studied at 100°C. It was found that faujasite sorbents with silver content higher than 20 wt% could maintain a high working capacity (up to 330 mg/g) and present a high ability for irreversible trapping. Finally, the stability of trapped iodine species was evidenced using additional tests performed at 120°C in presence of irradiation and humidity.