Investigating the impact of amine-functionalized ZSM-5 with varying Si/Al ratios on the adsorption of radioactive gaseous iodine

In order to efficiently and rapidly capture radioactive iodine that impacts the environment, this study involves impregnating Tetraethylenepentamine (TEPA) into ZSM-5 zeolite with varying Si/Al ratios and evaluating its adsorption performance towards iodine. It is found that the optimal preparation level is 30 %, leading to a significant increase in the saturated adsorption capacity compared to non-impregnated molecular sieves , with a four-fold improvement. The adsorption rate is also enhanced. Various amines are utilized for impregnation, and FT-IR and molecular computation techniques are employed to investigate the adsorption mechanisms between these amines and iodine. The discovery reveals potential interactions between the amine groups and iodine, such as N ⋅ ⋅ ⋅ I halogen bonding and N–H ⋅ ⋅ ⋅ I hydrogen bonding . These findings provide valuable insights for developing iodine adsorbents, offering promising solutions for protecting ecological and living environments.