Efficient iodine gas capture is necessitated in many industries like spent nuclear fuel off-gas treatment in view of environmental protection and resource recycling. However, the adsorption efficiency and stability of the current adsorbents are limited. In the present work, efficient and stable barbituric and thiobarbituric acid-based UiO-66-NH₂ adsorbents (i.e., UiO-66-NH-B.D and UiO-66-NH-T.D, respectively) have been synthesized by post-synthetic covalent modification. Characterization approaches, including SEM-EDS, TEM, XRD, FTIR, XPS, ¹H NMR, TGA and BET, are used to obtain information on the properties and adsorption mechanisms of these metal-organic framework (MOF) adsorbents. The kinetics and mechanisms involved are studied in detail. The treatment efficiency and recyclability of the adsorbents are checked and compared with the adsorbents reported in previous works. The results show that the current adsorbents are potentially suitable for efficient iodine gas capture. High maximum iodine adsorption amount by UiO-66-NH-B.D and UiO-66-NH-T.D (1.17 and 1.33 g/g) was achieved under 75 ^oC. These new adsorbents are thermally stable for iodine adsorption and regenerated and reused with good performance. The adsorption mechanisms were revealed based on experimental results, indicating that iodine is adsorbed by both physisorption and chemisorption.

从环境保护和资源回收的角度考虑，在乏核燃料废气处理等许多行业都需要有效的碘气体捕获。然而，目前吸附剂的吸附效率和稳定性是有限的。在目前的工作中，通过合成后共价键合成了高效稳定的巴比妥类和硫代巴比妥酸基 UiO-66-NH ₂吸附剂（即分别为 UiO-66-NH-BD 和 UiO-66-NH-TD）。修改。表征方法，包括 SEM-EDS、TEM、XRD、FTIR、XPS、¹H NMR、TGA 和 BET 用于获取有关这些金属有机骨架 (MOF) 吸附剂的性质和吸附机制的信息。详细研究了所涉及的动力学和机制。检查吸附剂的处理效率和可回收性，并与以前工作中报道的吸附剂进行比较。结果表明，目前的吸附剂可能适用于有效的碘气体捕获。 在 75 ^o下，UiO-66-NH-BD 和 UiO-66-NH-TD实现了较高的最大碘吸附量（1.17 和 1.33 g/g） C、这些新型吸附剂对碘的吸附热稳定，可再生再利用，性能良好。根据实验结果揭示了吸附机制，表明碘通过物理吸附和化学吸附两种方式被吸附。