Hydrogen bond-mediated strong adsorbent–I3− interactions enable high-efficiency radioiodine capture

摘要: Effectively capturing volatile radioiodine produced during the spent nuclear fuel reprocessing is an efficient way of safe utilization power. However, all existing capture methods fail to immobilize reliably due weak binding interaction between and adsorbent, resulting in unstable sites further iodine liberation. Herein, we report a pioneering approach overcome this challenge by synthesizing melamine-based polymer (MFP) with high energy I3− species instead conventional I2 molecules. Both experimental theoretical results confirmed that atoms strongly interact MFP via synergistic hydrogen bonds. According this, highest was achieved (Gibbs free energy: −260.38 kcal mol−1, which about four times stronger than widely used Ag–I ion bond), enabling effective enrichment without any escape. The extraordinary not only allowed steadily durably, but also afforded ultrahigh adsorption capacity (637 wt%, vapor). More interestingly, found showed promising for removing NO2, coexisted off-gas stream. To best our knowledge, first attempt remove both NO2. Last least, exhibited satisfactory practical applications under simulated conditions.