MIL-101(Cr) metal–organic framework functionalized with tetraethylenepentamine for potential removal of Uranium (VI) from waste water

Liu, Fengtai; Song, Shanshan; Cheng, Ge; Xiong, Wenjing; Shi, Lei; Zhang, Yi Bo

doi:10.1177/0263617418789516

Cited by 45 publications

(16 citation statements)

References 59 publications

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“…This trend is consistent with a progressive filling of the MOF pores. Figure a shows characteristic bands at 1740 and 1727 cm –1 corresponding to symmetric and asymmetric COO – stretching mode, respectively, ,− their intensity increases progressively upon NH 3 adsorption. This is associated with the formation of free pending CO groups that results from the metal-linker bond breaking as predicted for FS in Figure .…”

Section: Resultsmentioning

confidence: 98%

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

et al. 2021

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An unprecedented reversible guest-induced metallinker bond rearrangement in metal−organic framework (MOFs) was revealed by quantum-calculations and DRIFT experiments. As a showcase, the prototypical MOF-type MFM-300(Sc) was demonstrated to undergo a substantial Sc-carboxylate bond dynamics upon ammonia adsorption to enable a strong metal− guest binding mode, a key feature to ensure a highly efficient capture of this toxic molecule. Decisively, we evidenced this adsorption mechanism to be fully reversible, preserving the ammonia capture performance and structure integrity over multiple cycles. Such an unconventional mechanism in MOFs can open up new avenues to design novel materials for an efficient capture of highly corrosive molecules.

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Section: Resultsmentioning

confidence: 98%

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

et al. 2021

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“…Nevertheless, TEPA-MIL-101M B contains a small peak at 1125 cm –1 which is not present in TEPA-MIL-101M A . From literature, ,− grafting bonds at the Cr center are known to produce bands at this wavelength; however, bentonite clay produces bands from 1250–1000 cm –1 and grafting cannot be considered the sole contributor. Overall, Figure confirms the amine presence for both pre- and postimpregnation approaches and suggests coordinated Cr grafting for TEPA-MIL-101M B .…”

Section: Resultsmentioning

confidence: 99%

Amine-Functionalized MIL-101 Monoliths for CO₂ Removal from Enclosed Environments

et al. 2019

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Amine-functionalized metal−organic frameworks (MOFs) are facile adsorbents for CO 2 removal from enclosed environments. In this study, we prepared polyethylenimine (PEI) and tetraethylenepentamine (TEPA) impregnated MOFmonoliths using a 3D printing technique, through pre-and postfunctionalization approaches, and evaluated their CO 2 capture performances. For preimpregnation, the MIL-101 powder was impregnated with PEI or TEPA and printed to form the monoliths. Meanwhile, the postimpregnation technique directly printed the MOF powder and secondarily impregnated the monoliths with TEPA or PEI. The adsorption analysis results indicated that all impregnated monoliths showed improved CO 2 capacities from the pristine monolith at dilute concentrations, and preimpregnation yielded higher CO 2 uptakes than postimpregnation. Specifically, the preimpregnated TEPA and preimpregnated PEI monoliths, with 3.5 and 5.5 mmol N/g amine content, respectively, displayed a capture capacity of 1.6 and 1.4 mmol/g, respectively, at 3000 ppm and 25 °C. From CHN analysis, postimpregnation yielded ∼50 wt % less N content than preimpregnation which was attributed to reduced diffusion of aminopolymers into the MOF pores. This was further evidenced by the textural properties which showed nearly a 3fold increase in pore volume and a 2-fold increase in surface area for postimpregnation over preimpregnation. In turn, preimpregnated TEPA-MIL-101 exhibited the highest amine efficiency of 0.46 mmol CO 2 /mmol N. Furthermore, the TEPA grafting occurred during paste densification at 50 °C and resulted in the enhanced stability of TEPA-MIL-101 monoliths. Despite high adsorption capacity, the adsorptions kinetics were found to be relatively slow over 3D-printed amine-loaded MIL-101 monoliths, especially the preimpregnated monoliths, because the adsorption rate was limited by the CO 2 molecular diffusion into the monolith walls. Overall, this study establishes a route to formulate amine-MOF monoliths by a 3D printing technique; however, the monolith dimensions should be tuned to optimize adsorption kinetics.

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“…On the one side, both of them can serve as Lewis base active sites to interact with U(VI) ions. On the other side, N-containing chemical bonds like the amidoxime and amide groups possess strong affinity for binding U(VI) ions. , Consideration is also being given to the synergistic effects of acidic and basic ligands on the formation of new MOFs; thus, in this work, N -pyridin-4-ylpyridine-4-carboxamide (NPYC) with an amide function as a synergistic ligand was selected together with pyromellitic acid (PMA) to coordinate with Zn(II) to put together a fluorescent MOF (Zn 2 [PMA][NPYC][H 2 O] 2 ·2H 2 O, named HNU-50 ). As expected, HNU-50 can simultaneously detect and adsorb U(VI) from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

A Zinc Metal–Organic Framework for Concurrent Adsorption and Detection of Uranium

Qin

Yang

et al. 2020

Inorg. Chem.

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Uranium is one of the principal raw materials in the nuclear industry, but if released into the natural environment, it also poses latent health risks to mankind. Therefore, there is an urgent need to develop a strategy that can concurrently detect and adsorb uranium to realize the sustainable development of nuclear power and protect the environment. In this work, a fluorescent zinc-based metal–organic framework (HNU-50) was designed and synthesized for the effective detection and extraction of U(VI). The amide groups on N-pyridin-4-ylpyridine-4-carboxamide ligands and two uncoordinated carboxyl oxygen atoms on pyromellitic acid ligands in HNU-50 provide potential uranium-binding sites. Consequently, HNU-50 is competent of selectively and efficiently catching uranyl ions, achieving an optimum adsorption capacity of 632 mg/g. Additionally, the adsorption of U(VI) results in fluorescence quenching of HNU-50, thus allowing sensitive and selective detection of U(VI) by fluorescence change. Note that HNU-50 exhibits a considerably low detection limit of 1.2 × 10–8 M for U(VI) in aqueous solution, which is below the World Health Organization maximum pollution standards for potable water (6.3 × 10–8 M).

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MIL-101(Cr) metal–organic framework functionalized with tetraethylenepentamine for potential removal of Uranium (VI) from waste water

Cited by 45 publications

References 59 publications

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

Amine-Functionalized MIL-101 Monoliths for CO₂ Removal from Enclosed Environments

A Zinc Metal–Organic Framework for Concurrent Adsorption and Detection of Uranium

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MIL-101(Cr) metal–organic framework functionalized with tetraethylenepentamine for potential removal of Uranium (VI) from waste water

Cited by 45 publications

References 59 publications

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

Amine-Functionalized MIL-101 Monoliths for CO2 Removal from Enclosed Environments

A Zinc Metal–Organic Framework for Concurrent Adsorption and Detection of Uranium

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Amine-Functionalized MIL-101 Monoliths for CO₂ Removal from Enclosed Environments