The development of efficient adsorbents to remove radioactive methyl iodide (CH₃I) in humid environments is crucial for air purification after pollution by nuclear power plant waste. In this work, we successfully prepared a post-synthetic covalent modified MIL-101 with a sulfonate group followed by the ion-exchange of Ag (I), which is well characterized by diffuse reflectance FT-IR spectroscopy, X-ray photoelectron spectroscopy (XPS) and the hydrophobic index (HI). After modification of the MOFs, we applied functionalized MIL-101 obtained by either one-pot synthesis (MIL-101-SO₃Ag) or a post-synthetic modification process (MIL-101-RSO₃Ag, R = NH(CH₂)₃) to remove the CH₃I at an extremely low concentration (0.31 ppm) in an environment with very high relative humidity (RH 95%). Enhanced hydrophobicity of the surface-modified MIL-101 was evaluated by examining the HI with the competitive adsorption of water and cyclohexane vapor, with a high surface area maintained, as confirmed by Ar physisorption. Interestingly, the post-synthetically modified MIL-101-RSO₃Ag showed exceptional adsorption performance as determined by its decontamination factor (DF = 195,350) at 303 K and RH 95%. This performance was in comparison to Ag (I)-exchanged 13X zeolite and MIL-101-SO₃Ag, which include much higher amounts of Ag. Furthermore, MIL-101-RSO₃Ag retained ~94–100% of its fresh adsorbent performance during five cycle repetitions.

开发有效的吸附剂以去除潮湿环境中的放射性碘甲烷（CH ₃ I）对于核电站废料污染后的空气净化至关重要。在这项工作中，我们成功地制备了具有磺酸盐基团的合成后共价修饰的MIL-101，随后进行了银（I）的离子交换，其特征在于漫反射FT-IR光谱，X射线光电子能谱（ XPS）和疏水指数（HI）。在对MOF进行修饰后，我们应用了通过一锅法合成（MIL-101-SO ₃ Ag）或合成后修饰过程（MIL-101-RSO ₃ Ag，R = NH（CH _2））₃）移除CH ₃I在相对湿度（RH 95％）很高的环境中浓度极低（0.31 ppm）。通过Ar与水和环己烷蒸气的竞争性吸附来检查HI，从而评估表面改性MIL-101的增强的疏水性，并保持较高的表面积，这已通过Ar物理吸附得到了证实。有趣的是，合成后改性的MIL-101-RSO ₃ Ag在303 K和RH 95％时表现出优异的吸附性能，这取决于其去污系数（DF = 195,350）。该性能与包含更高量的Ag的Ag（I）交换的13X沸石和MIL-101-SO ₃ Ag相比。此外，MIL-101-RSO ₃ Ag在五个循环重复过程中保留了约94-100％的新鲜吸附性能。