Adsorption of iodine in metal–organic framework materials

Abstract

The chemistry and applications of metal–organic framework materials for iodine and polyiodide capture and storage are reviewed.

Two isomeric metal–organic frameworks bearing stilbene moieties for highly volatile iodine uptake

“…[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Recently, several MOFs have been reported as promising candidates for iodine adsorption. [26][27][28][29][30] Various approaches have been developed to enhance the I 2 adsorption performance of MOF materials; 31 however, rational design and fabrication of MOFs with excellent iodine adsorption still remain big challenges. One effective strategy is to introduce electron-pair donors including pyridine, R 2 O, ROH, RNH 2 , etc., or conjugated π-electron units into the frameworks to functionalize MOFs, which could form stable halogen bonds or charge-transfer (CT) complexes with I 2 , thereby increasing the adsorption capacity.…”

“…[32][33][34][35][36][37][38][39][40][41][42] It is noteworthy that the adsorption ability is not only concerned with the interaction of I 2 and frameworks, effective sorption sites, and the effect of I 2 (which may form polyiodide anions), but also the surface areas, porosity, pore structures and topology of MOF materials. 31,43,44 Iso-reticular MOFs have provided a good platform to explore I 2 adsorption; [45][46][47] nonetheless, the utilization of isomeric MOFs with the same active iodine-sorption units, to comparatively study the structure-function relationship and thereafter improve the I 2 uptake capacity, has been rarely reported.…”

Highly Conjugated Two‐dimensional Covalent Organic Frameworks for Efficient Iodine Uptake

“…Several solid sorbents such metal-organic frameworks (MOFs) and silver-based zeolites have been developed to remove iodine vapor by taking advantage of high porosity and surface area, and the strong affinity between silver and iodine, respectively. [4][5][6] However, the generally low acid stability of MOFs and poor capture capacity of silver-impregnated zeolites limited prosperous development in real applications. Porous organic polymers are also used as adsorbents for iodine capture.…”

“…Considering these side effects, it is necessary and urgent to develop effective approaches to capture iodine vapor. Several solid sorbents such metal‐organic frameworks (MOFs) and silver‐based zeolites have been developed to remove iodine vapor by taking advantage of high porosity and surface area, and the strong affinity between silver and iodine, respectively [4–6] . However, the generally low acid stability of MOFs and poor capture capacity of silver‐impregnated zeolites limited prosperous development in real applications.…”

Combination of aluminum molecular rings with chemical reduction centers for iodine capture and aggregation

“…Among them, crystalline metal-organic frameworks serve as an exciting avenue to capture iodine due to their facile functionalization, stable and high surface area, porous nature, and the controllability of framework components. [11][12][13][14] MFM-300(Sc) constructed by Martin Schröder et al has stable porosity to promote efficient stacking of I 2 with an adsorption capacity of 1.54 g −1 . 15 However, the host-guest interactions are generally illustrated via spectroscopic methods, and the direct observation of binding sites at the atomic level is challenging, especially for the gas adsorption process.…”