Iodine Adsorption in Tetrathiafulvalene-Based Covalent Organic Frameworks
2020
To safeguard the development of nuclear energy, practical
techniques for capture and storage of radioiodine are of critical importance
but remains a significant challenge. Here
we report the synergistic effect of physical and chemical adsorption of iodine
in tetrathiafulvalene-based covalent organic frameworks (COFs), which can markedly
improve both iodine adsorption capacity and adsorption kinetics due to their strong interaction. These functionalized
architectures are designed to have high specific surface areas (up to 2359 m2 g−1) for efficient physisorption
of iodine, and abundant tetrathiafulvalene functional groups for strong chemisorption
of iodine. We demonstrate that these frameworks achieve excellent iodine
adsorption capacity (~ 8.15 g g-1)
and adsorption kinetics (~ 0.69 g g-1 h-1), which are much higher than other materials
reported so far, including silver-doped adsorbents, inorganic porous materials, metal−organic
frameworks, porous organic frameworks, and other COFs. Furthermore, a combined theoretical and experimental study, including DFT calculations, electron paramagnetic resonance spectroscopy, X-ray
photoelectron spectroscopy, and Raman spectroscopy, reveals the strong chemical
interaction between iodine and framework of material. Our study thus opens an
avenue to construct functional COFs for a critical environment-related application.
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