Zirconium-Based Metal–Organic Framework for Removal of Perrhenate from Water

Banerjee, Debasis; Xu, Wenqian; Nie, Zimin; Johnson, Lewis E.; Coghlan, Campbell J.; Sushko, Maria L.; Kim, Dong-Sang; Schweiger, Michael J.; Kruger, Albert A.; Doonan, Christian J.; Thallapally, Praveen K.

doi:10.1021/acs.inorgchem.6b01004

Cited by 157 publications

(94 citation statements)

References 20 publications

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“…The resulting charged framework can efficiently remove ReO 4 − (to simulate radioactive 99 TcO 4 − ) from aqueous solution through anion exchange. A related work reported by the same group used a similar strategy to create cationic framework on a UiO‐66 platform . Different from the above work, this time the amino group originally attached to the terephthalic acid was turned into ammonium by acidification.…”

Section: Liquid Phase Separationmentioning

confidence: 99%

Metal–Organic Frameworks for Separation

et al. 2018

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Separation is an important industrial step with critical roles in the chemical, petrochemical, pharmaceutical, and nuclear industries, as well as in many other fields. Although much progress has been made, the development of better separation technologies, especially through the discovery of high-performance separation materials, continues to attract increasing interest due to concerns over factors such as efficiency, health and environmental impacts, and the cost of existing methods. Metal-organic frameworks (MOFs), a rapidly expanding family of crystalline porous materials, have shown great promise to address various separation challenges due to their well-defined pore size and unprecedented tunability in both composition and pore geometry. In the past decade, extensive research is performed on applications of MOF materials, including separation and capture of many gases and vapors, and liquid-phase separation involving both liquid mixtures and solutions. MOFs also bring new opportunities in enantioselective separation and are amenable to morphological control such as fabrication of membranes for enhanced separation outcomes. Here, some of the latest progress in the applications of MOFs for several key separation issues, with emphasis on newly synthesized MOF materials and the impact of their compositional and structural features on separation properties, are reviewed and highlighted.

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Section: Liquid Phase Separationmentioning

confidence: 99%

Metal–Organic Frameworks for Separation

et al. 2018

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“…Low dimensional cationic polymeric materials have shown uptake and immobilization of TcO 4 – . Cationic metal‐organic frameworks (MOFS) that have been engineered to include binding sites that can selectively coordinate to TcO 4 – during the anion‐exchange process have demonstrated improved selectivity and kinetics. Recently, improvements in stability of these materials while maintaining the selectivity, kinetics and adsorption capacity have been demonstrated …”

Section: Introductionmentioning

confidence: 99%

Strategies for the Photoreduction of Tc‐99 Pertechnetate to Low‐Valent Tc by Keggin Polyoxometalates

et al. 2020

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Technetium‐99 (half‐life of 2.1 × 105 yrs, βmax = 0.29 MeV) is a hazardous radiological contaminant, which, in its predominant form of pertechnetate (TcO4–), is highly mobile in the environment. Most strategies for the removal of pertechnetate from the environment involve uptake and/or absorption of pertechnetate using resins, clays, cationic metal‐organic frameworks and even thorium borate ceramic like materials. Alternative approaches have involved the reduction and subsequent sequestration of lower valent technetium species using iron, sulfides, or iron sulfides. Our lab has explored this strategy using the lacunary alpha‐2 Wells–Dawson polyoxometalate (α2‐[P2W17O61]10–) to both reduce and sequester lower valent technetium, and we have reported on the ligand features that stabilize the reduced species. In this work we investigate the potential of “plenary” Keggin POMs (XW12O40n–) (X = P, Si, Al, n = 3, 4, 5, respectively) to both reduce TcO4– and stabilize the reduced Tc species. Specifically, we report on the mechanism by which the reduction of technetium occurs and find that PW12, SiW12, and AlW12 promote the reduction of TcO4– to lower valent states. X‐ray absorption spectroscopy was used to confirm a combination of TcIV {in the form of TcO2·2H2O and Tc2(µ‐O)24+} and TcV, which is subsequently complexed into a POM defect as a TcV=O species.

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“…The sorption equilibrium was reached within 20 min, much shorter than the corresponding times of other similar cationic MOFs. For example, SLUG‐21 and UiO‐66‐NH 3 + Cl − require longer than 24 h to reach equilibrium . As clearly seen in Figures b and S7 (Supporting Information), the sorption kinetics of SCU‐102 is faster than that of state‐of‐the‐art anion‐exchange resins (Purolite A532E and A530E) that are particularly designed for removing hydrophobic ClO 4 − and TcO 4 − .…”

Section: Figurementioning

confidence: 99%