Metal-organic framework patterns and membranes with heterogeneous pores for flow-assisted switchable separations

Jeong, Guan‐Young; Singh, Ajay; Kim, Min; Gyak, Ki‐Won; Ryu, UnJin; Choi, Kyung Min; Kim, Dong‐Pyo

doi:10.1038/s41467-018-06438-0

Cited by 75 publications

(50 citation statements)

References 33 publications

(31 reference statements)

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“…etal-organic frameworks (MOFs) are a new type of crystalline porous materials that are self-assembled by the coordination of metal cations/clusters with organic linkers 1 , which have broad applications in gas storage and separation [2][3][4] , catalysis 5 , sensor 6 , drug delivery 7 , etc. Particularly, MOFs have exhibited promising catalytic potentials towards many kinds of reactions owing to their designable metal-oxo clusters bridging organic linkers, modifiable structure, and intrinsic porosities 8 .…”

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confidence: 99%

CO2 controls the oriented growth of metal-organic framework with highly accessible active sites

Zhang

et al. 2020

Nat Commun

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The production of 2D metal-organic frameworks (MOFs) with highly exposed active surfaces is of great importance for catalysis. Here we demonstrate the formation of MOF nanosheets by utilizing CO 2 as a capping agent to control the oriented growth of MOF. This strategy has many advantages over the conventional methods. For example, it is template-free and proceeds at mild temperature (35°C), CO 2 can be easily removed by depressurization, and the properties of the MOF nanosheets can be well adjusted by changing CO 2 pressure. Such a simple, rapid, efficient and adjustable route produces MOF nanosheets with ultrathin thickness (∼10 nm), small lateral size (∼100 nm) and abundant unsaturated coordination metal sites on surfaces. Owing to these unique features, the as-synthesized MOF nanosheets exhibit superior activity for catalyzing the oxidation reactions of alcohols.

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confidence: 99%

CO2 controls the oriented growth of metal-organic framework with highly accessible active sites

Zhang

et al. 2020

Nat Commun

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“…The MIL-101(Cr) was synthesized by referring to the pervious literature [19]. Typically, chromium(III) nitrate nonahydrate (Cr(NO 3 ) 3 •9H 2 O) (1.2 g), terephthalic acid (H 2 BDC) (500 mg), and hydrofluoric acid (HF) (0.09 mL) were mixed with 15 mL H 2 O in a Teflon-lined stainless steel autoclave, and then, it was heated to 220°C for 8 h. After cooling down to the room temperature, the mixture was centrifuged and washed with N,N-dimethylformamide (DMF) and deionized water.…”

Section: Synthesis Of Mil-101(cr) and Mil-101(cr)/cb Electrodementioning

confidence: 99%

Photo-electrochemical detection of dopamine in human urine and calf serum based on MIL-101 (Cr)/carbon black

Zhang

Zha

et al. 2020

Microchim Acta

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A new photo-electrochemical sensor based on MIL-101(Cr) MOF/carbon black (CB) is fabricated and characterized. By using differential pulse voltammetry, dopamine (DA) can be effectively detected using a photo-electrochemical MIL-101(Cr)/CB sensor under visible light. The CB acts as the electron bridge to combine with the large specific surface area and photocatalytic feature of MOF, which contribute to the improvements of sensitivity of DA detection. The concentration of the catalyst, pH value, accumulation potential, and accumulation time were also optimized. Furthermore, the electrochemical performances of MIL-101(Cr)/CB sensor was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scan rate, electrochemically active surface area (ECSA), and amperometric responses. A detection limit of 0.38 nM (LOD = 3 s b /S, s b = 0.028) and a working range of 1 nM to 2.22 μM has been achieved. The MIL-101(Cr)/CB sensor exhibits excellent reproducibility, stability, and selectivity and also has satisfactory recovery rate for the analysis of real samples including calf serum and human urine.

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“…Amorphous metal–organic framework (MOF) is recently of great interest in innovative material science despite the absence of selective porosity, which is a crucial characteristics of crystalline MOF . Although highly ordered crystalline MOFs have exhibited high performance in the separation of gases and polymers and desalination, the argument that prevalent association between performance and ordered structural arrangement is flawed arises as a limitation for further development of the field of coordination polymer and MOF . Recently, mixed‐matrix membrane combined with in situ amorphized zeolitic imidazolate framework (ZIF)‐8 is proposed to have highest CO 2 /CH 4 selectivity compared to crystalline MOF‐loaded mixed‐matrix membranes .…”

Section: Introductionmentioning

confidence: 99%

Versatile Amorphous Structures of Phosphonate Metal−Organic Framework/Alginate Composite for Tunable Sieving of Ions

Park

Lee

2019

Adv Funct Materials

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Versatile amorphous structures of phosphonate metal-organic framework (pMOF)/alginate composite are proposed to selectively separate alkaline and alkaline earth metal ions. Initially, the gelation of alginate by Al 3+ ions provides preconfined Al 3+ coordination. The phosphonate organic ligand is subsequently coordinated with Al 3+ ions to make pMOF based on the preconfined Al 3+ coordination. Al 3+ −phosphonate organic ligand complexes of pMOF are simultaneously intertwined with Al 3+ −alginate crosslinks with the aid of partial hydrolysis. Amorphous structures of Al 3+ -based pMOF/ alginate composite are largely modulated, as the reaction temperature and intertwinement degree of alginate networks vary. In addition, partial hydrolysis plays an important role for amorphization, which gives rise to versatile amorphous structures. The Al 3+ -based pMOF/alginate composite is found to have tunable sieving of alkaline and alkaline earth metal ions with varying the degrees of intertwinement of amorphous structures and Al 3+ −phosphonate organic ligand complexes. In particular, a certain type of amorphous structure can effectively reject Li + ions with small hydration energy through dehydration. Benefiting from amorphous structures, this work will provide a variety of separation opportunities accompanying unique properties and allow efficient separation of ions and similar-sized molecules.

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Metal-organic framework patterns and membranes with heterogeneous pores for flow-assisted switchable separations

Cited by 75 publications

References 33 publications

CO2 controls the oriented growth of metal-organic framework with highly accessible active sites

CO2 controls the oriented growth of metal-organic framework with highly accessible active sites

Photo-electrochemical detection of dopamine in human urine and calf serum based on MIL-101 (Cr)/carbon black

Versatile Amorphous Structures of Phosphonate Metal−Organic Framework/Alginate Composite for Tunable Sieving of Ions

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