Defect Engineering of Nanoscale Hf-Based Metal–Organic Frameworks for Highly Efficient Iodine Capture

Abstract

With the rapid development of the nuclear industry, how to deal with radioactive iodine waste in a timely and effective manner has become an important issue to be solved urgently. Herein, the defect-engineering strategy has been applied to develop a metal–organic framework (MOF)-based solid adsorbent by using the classical UiO-type Hf-UiO-66 as an example. After simple acid treatment, the produced defect-containing Hf-UiO-66 (DHUN) not only retains its topological structure, high crystallization, and regular shape but also shows a great increase in the Brunauer–Emmett–Teller value and pore size in comparison with the original Hf-UiO (HUN). These formed defects within DHUN have been demonstrated to be important for the great enhancement of the iodine capture and following application in computed tomography imaging in vitro. This present work gives a new insight into the control and formation of defect sites, and this simple and efficient defect-engineering strategy also shows great promise for the development of novel solid adsorbents and other functional MOF materials.

Capture of Gaseous Iodine in Isoreticular Zirconium‐Based UiO‐n Metal‐Organic Frameworks: Influence of Amino Functionalization, DFT Calculations, Raman and EPR Spectroscopic Investigation

“…[24] These reports dealt with the use of iodine vapor generated in a closed cell, in contact with the considered powdered UiO-n compounds, which are then weighted for the estimation of iodine uptake. For this UiO-n series, other works also described the influence of defects in the UiO-66 (Hf) solids [25] or the effects of the nature of a wide variety of functional organic groups decorating the ditopic ligands in UiO-66, [26] by analyzing the iodine sorption from liquid phase using cyclohexane as solvent.…”

A Mesoporous Lead-Doped Titanium Oxide Compound with High Performance and Recyclability in I2 Uptake and Photocatalysis

“…Because the chemical scrubbing methods currently used in reprocessing facilities face recyclability issues, , numerous strategies for efficient removal of radioactive I 2 have been devised mainly on the basis of the development of novel and effective adsorbents. Accordingly, a new generation of solid adsorbents that are very promising for I 2 reprocessing like porous polymers, graphene-based nanomaterials, zeolites, and covalent– and metal–organic frameworks (COFs and MOFs, respectively) has been developed. , Among them, organic–inorganic hybrid crystalline materials are very promising not only because of their efficiency but also because of their atomically precise structures, which makes it possible to elucidate the mechanism of I 2 uptake and release. For example, Yao recently reported mesoporous crystalline material assembled with aluminum–oxo carboxylate rings as the hosts for uptake of I 2 guests.…”

Mixed-Linker Strategy for the Construction of Metal–Organic Framework Combined with Dyes toward Alcohol Detection

“…In addition, the correlation between the UV absorbance of iodine at 523 nm and time is plotted to study the adsorption process in detail (Figure S31). The result suggested that the adsorption rate of iodine was very fast initially and then become steady in an exponential manner ( R 2 = 99.76%) . As far as we know, the speed is faster than any other materials reported in the literature (Table S3).…”