Covalent Organic Frameworks Functionalized with Thioether or Vinyl Groups for Efficient and Rapid Capture of Multiple Iodine Pollutants

• • PD-WY achieves iodine vapor uptake of 4.88 g g−1 at 75°C, surpassing many reported COFs; this high capacity is critical for reducing adsorbent volume in off-gas treatment systems. • • PD-WY exhibits rapid adsorption kinetics with K80% values of 3.25 g g−1 h−1 for I2 and 7.89 g g−1 h−1 for I3−, enabling fast decontamination in dynamic flow scenarios. • • In aqueous phase, PD-WY adsorbs 3.56 g g−1 of I3−, demonstrating effectiveness for water remediation; in organic phase, it captures 2.00 g g−1 of iodine in cyclohexane, showing versatility across media. • • The COFs maintain robust chemical resistance and thermal stability, essential for practical application under harsh nuclear waste conditions.