Extraordinary NO₂ Removal by the Metal–Organic Framework UiO‐66‐NH₂

Abstract

Here we discuss the removal of nitrogen dioxide, an important toxic industrial chemical and pollutant, from air using the MOF UiO-66-NH2 . The amine group is found to substantially aid in the removal, resulting in unprecedented removal capacities upwards of 1.4 g of NO2 /g of MOF. Furthermore, whereas NO2 typically generates substantial quantities of NO on sorbents, the amount generated by UiO-66-NH2 is significantly reduced. Of particular significance is the formation of a diazonium ion on the aromatic ring of the MOF, and the potential reduction of NO2 to molecular nitrogen.

Selective decontamination of the reactive air pollutant nitrous acid via node-linker cooperativity in a metal–organic framework

“…[35][36][37][38][39][40] Beyond these applications, specic MOFs have been featured in environmental decontamination strategies. [41][42][43][44][45][46][47][48] The present work illustrates a chemisorption solution ( Fig. 1) for nitrous acid (and ultimately NO x ) where capacity, reactivity, and selectivity are greater than under physisorption conditions.…”

Metal–Organic Frameworks for Separation

“…Recently, there is an increasing demand on capturing environmentally hazardous components from various mixtures of gases or vapors. Examples include CO 2 capture and sequestration, capture of toxic gaseous pollutants such as NH 3 , H 2 S, SO x , NO x , CO, and fluorocarbons, and even capture of chemical warfare agents . In addition, some gas‐phase separations, such as H 2 /D 2 separation, Xe/Kr separation, and capture of iodine vapor, are relevant to nuclear fuel purification and nuclear waste treatment.…”

Metal−Organic Frameworks for High‐Energy Lithium Batteries with Enhanced Safety: Recent Progress and Future Perspectives

“…The higher the oxidation state and the charge density of the metal ion, the harder is the metal ion (i. e., harder acid), and the stronger is the metal‐carboxylate ligand bond strength, which leads to better MOF stability . In this regard, tetravalent Zr(IV)‐based MOFs such as UiO‐66 have shown great stability and have been widely studied with respect to gas capture, Li−S batteries, and solid‐state electrolytes . In divalent transition metal‐organic octahedral complexes, their relative stabilities have been found to follow the Irving‐Williams order Mn<Fe<Co<Ni≈Zn<Cu regardless of the nature of the coordinated ligand .…”