Functionalized Metal–Organic Framework with Azo Double and Amide Groups for Highly Efficient Iodine Capture

Abstract

The development of practical techniques for trapping radioactive iodine (I 2 ) is crucial to the safe development of nuclear power. Herein, we reported a functionalized porous metal−organic framework (MOF), [Zn 3 (ABTC) 1.5 (4-Hpich)(H 2 O) 3 ]•10H 2 O (Zn-ABTC) (H 4 ABTC = 2,2′,5,5′-azobenzenetetracarboxylic acid, 4-Hpcih = 4-pyridinecarbaldehyde isonicotinoyl hydrazone), with azo double and amide groups. The adsorption experiments showed that Zn-ABTC exhibited excellent adsorption capacity for volatile I 2 (2.02 g g −1 ) and I 2 cyclohexane solution (526 mg g −1 ) due to the introduction of nitrogen and oxygen active sites into the framework. Furthermore, Zn-ABTC has excellent recoverability and stability, retaining its adsorption capacity, even after five cycles. The spectroscopic analysis revealed the multiple interactions between the I 2 molecules and azo double as well as amide groups. This work provides a rational strategy for constructing functional MOF materials for I 2 adsorption.