Dalapati Monotosh, Singha Raghunath, Maity Pankaj, Manna Debashree, Samanta Dipak
School of Chemical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, An OCC of Homi Bhabha National Institute (HBNI), PO Bhimpur- Padanpur, Via Jatni, Khordha, Odisha, 752050, India.
Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, v.v.i., Flemingovo nám. 2, Prague 6, Praha, 16610, Czech Republic.
Small. 2025 Aug;21(33):e2504242. doi: 10.1002/smll.202504242. Epub 2025 Jun 29.
The excessive release of iodine from industrial and medical activities has led to severe contamination of air and water, causing major concern to public health. Effective capture and secure storage of radioactive iodine in both vapor and aqueous phases are crucial for nuclear safety and ecological protection. In this study, it is explore four non-porous metal-organic coordination cages (MC1-MC4) comprising of Pd-acceptors and diverse aromatic ligands for iodine adsorption across different media. These cages exhibit remarkable iodine uptake, reaching 3.38 g g⁻¹ in the vapor phase at 75 °C and ≈2.73 g g⁻¹ in aqueous solution, with significantly faster adsorption kinetics than covalent organic framework (COF)- and metal-organic framework (MOF)-based materials. Moreover, high adsorption capacities are observed in dynamic flow-through experiments, with MC2 achieving an elution volume of up to 7.8 L g⁻¹ in a 0.5 mM I₃⁻ solution. Practical tests confirm their efficiency in removing iodine from seawater and drinking water, reducing 5 ppm concentrations to ppb levels. Additionally, the cages exhibit outstanding adsorption of methyl iodide vapor, achieving uptake capacities as high as 0.94 g g⁻¹ under ambient conditions. With high stability, recyclability, and scalable synthesis, these metal-organic cages emerge as promising nano-adsorbents for iodine and methyl iodide removal from various environmental matrices.
工业和医疗活动中碘的过量释放导致空气和水受到严重污染，引起了公众健康的重大担忧。有效捕获并安全储存气相和水相中的放射性碘对于核安全和生态保护至关重要。在本研究中，探索了四种由钯受体和不同芳香配体组成的无孔金属有机配位笼（MC1-MC4），用于在不同介质中吸附碘。这些笼子表现出显著的碘吸附能力，在75°C的气相中碘吸附量达到3.38 gg⁻¹，在水溶液中约为2.73 gg⁻¹，其吸附动力学明显快于基于共价有机框架（COF）和金属有机框架（MOF）的材料。此外，在动态流通实验中观察到高吸附容量，MC2在0.5 mM I₃⁻溶液中的洗脱体积高达7.8 L g⁻¹。实际测试证实了它们在从海水和饮用水中去除碘方面的效率，可将5 ppm的浓度降低到ppb水平。此外，这些笼子对甲基碘蒸气表现出出色的吸附能力，在环境条件下吸附容量高达0.94 gg⁻¹。由于具有高稳定性、可回收性和可扩展合成性，这些金属有机笼成为从各种环境基质中去除碘和甲基碘的有前途的纳米吸附剂。
