Adsorption And Enrichment Of Simulated Cs-137 In Geopolymer Foams

Separation and removal of Cs-137 with long decay period and high decay heat will be beneficial to the subsequent treatment and disposal of radioactive wastes. In this study, geopolymer foams (GFs) with proper mechanical performance and density of 300-600 kg/m(3) have been prepared through prefabricated foam method, which were proposed to be used as the adsorbent monoliths for Cs-137 based on its zeolite-like and hierarchical micro- and meso- pore structures. The prepared bulk GF exhibited remarkable adsorption capacity (192.14 mg/g) and desorption efficiency (64.92%) for simulated Cs-137 in aqueous solution. Furthermore, the adsorption process followed Pseudo-second-order kinetic and Langmuir isotherm models, which was also spontaneous, endothermic, and entropy increased. Finally, the adsorption and enrichment mechanism of simulated Cs-137 in GFs was thus proposed.