scholarly journals Methodologies for evaluation of metal–organic frameworks in separation applications

RSC Advances ◽  
2015 ◽  
Vol 5 (64) ◽  
pp. 52269-52295 ◽  
Author(s):  
Rajamani Krishna
Keyword(s):  
Metal Organic Frameworks ◽  
Fixed Bed ◽  
Separation Performance ◽  
Uptake Capacity ◽  
Adsorption Selectivity ◽  
Diffusion Limitations ◽  
Number Of Factors ◽  
Metal Organic ◽  
B Uptake

The separation performance of fixed-bed adsorbers is governed by a number of factors that include (a) adsorption selectivity, (b) uptake capacity, and (c) intra-crystalline diffusion limitations.

Metal–organic frameworks for the removal of the emerging contaminant atenolol under real conditions

2021 ◽  
Vol 50 (7) ◽  
pp. 2493-2500
Author(s):  
Sara Rojas ◽  
Jorge A. R. Navarro ◽  
Patricia Horcajada
Keyword(s):  
Continuous Flow ◽  
Metal Organic Frameworks ◽  
Fixed Bed ◽  
Emerging Contaminant ◽  
Flow Conditions ◽  
Metal Organic ◽  
Fixed Bed System

A defective Metal-Organic Frameworks as an improved material for the construction of a fixed-bed system working under continuous flow conditions for the removal of the emerging contaminant atenolol.

scholarly journals Gas Adsorption Selectivity in Topologically Disordered Metal–Organic Frameworks

2021 ◽  
Author(s):  
Adam Sapnik ◽  
Christopher W. Ashling ◽  
Lauren K. Macreadie ◽  
Seok J. Lee ◽  
Tim Johnson ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Interaction Strength ◽  
Functional Materials ◽  
Adsorption Selectivity ◽  
Guest Molecules ◽  
Sorption Behaviour ◽  
Ideal Adsorbed Solution Theory ◽  
Industrial Gases ◽  
Metal Organic

<div><p>Disordered metal–organic frameworks are emerging as an attractive class of functional materials, however their applications in gas storage and separation have yet to be fully explored. Here, we investigate gas adsorption in the topologically disordered Fe-BTC framework and its crystalline counterpart, MIL‑100. Despite their similar chemistry and local structure, they exhibit very different sorption behaviour towards a range of industrial gases, noble gases and hydrocarbons. Virial analysis reveals that Fe-BTC has enhanced interaction strength with guest molecules compared to MIL‑100. Most notably, we observe striking discrimination between the adsorption of C<sub>3</sub>H<sub>6</sub> and C<sub>3</sub>H<sub>8</sub> in Fe‑BTC, with over a twofold increase in the amount of C<sub>3</sub>H<sub>6</sub> being adsorbed than C<sub>3</sub>H<sub>8</sub>. Thermodynamic selectivity towards a range of industrially relevant binary mixtures is probed using ideal adsorbed solution theory (IAST). Together, this suggests the disordered material may possess powerful separation capabilities that are rare even amongst crystalline frameworks.</p></div>

scholarly journals Temperature dependence of adsorption hysteresis in flexible metal organic frameworks

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Shamsur Rahman ◽  
Arash Arami-Niya ◽  
Xiaoxian Yang ◽  
Gongkui Xiao ◽  
Gang (Kevin) Li ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Capillary Condensation ◽  
Metal Organic Frameworks ◽  
Sorption Isotherms ◽  
Separation Performance ◽  
Process Simulations ◽  
Metal Organic ◽  
Flexible Metal ◽  
Pressure Swing ◽  
External Stimuli

Abstract“Breathing” and “gating” are striking phenomena exhibited by flexible metal-organic frameworks (MOFs) in which their pore structures transform upon external stimuli. These effects are often associated with eminent steps and hysteresis in sorption isotherms. Despite significant mechanistic studies, the accurate description of stepped isotherms and hysteresis remains a barrier to the promised applications of flexible MOFs in molecular sieving, storage and sensing. Here, we investigate the temperature dependence of structural transformations in three flexible MOFs and present a new isotherm model to consistently analyse the transition pressures and step widths. The transition pressure reduces exponentially with decreasing temperature as does the degree of hysteresis (c.f. capillary condensation). The MOF structural transition enthalpies range from +6 to +31 kJ·mol−1 revealing that the adsorption-triggered transition is entropically driven. Pressure swing adsorption process simulations based on flexible MOFs that utilise the model reveal how isotherm hysteresis can affect separation performance.

Two tetranuclear Cd-based metal–organic frameworks for sensitive sensing of TNP/Fe3+ in aqueous media and gas adsorption

CrystEngComm ◽  
2020 ◽  
Vol 22 (41) ◽  
pp. 6927-6934
Author(s):  
Ruihong Guo ◽  
Lingling Gao ◽  
Jinxia Liang ◽  
Zhikai Zhang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Aqueous Media ◽  
Soil Samples ◽  
Mixed Ligand ◽  
Adsorption Selectivity ◽  
Metal Organic

Two Cd-MOFs were solvothermally synthesized by mixed-ligand strategy. 1 has the largest adsorption selectivity for CO2. Furthermore, 1 and 2 present sensitive sensing for TNP/Fe3+ in water or soil samples.

Impact of intrinsic framework flexibility for selective adsorption of sarin in non-aqueous solvents using metal–organic frameworks

2020 ◽  
Vol 22 (11) ◽  
pp. 6441-6448 ◽  
Author(s):  
Jongwoo Park ◽  
Mayank Agrawal ◽  
Dorina F. Sava Gallis ◽  
Jacob A. Harvey ◽  
Jeffery A. Greathouse ◽  
...  
Keyword(s):  
Selective Adsorption ◽  
Metal Organic Frameworks ◽  
Adsorption Selectivity ◽  
Complex Molecules ◽  
Metal Organic

We assess the nontrivial deviation in predicting the adsorption selectivity from bulk mixtures of complex molecules using nanoporous adsorbents approximated as rigid and intrinsically flexible.

A Series of Mesoporous Metal‐Organic Frameworks with Tunable Windows Sizes and Exceptionally High Ethane over Ethylene Adsorption Selectivity

2020 ◽  
Vol 59 (46) ◽  
pp. 20561-20567 ◽  
Author(s):  
Anna A. Lysova ◽  
Denis G. Samsonenko ◽  
Konstantin A. Kovalenko ◽  
Anton S. Nizovtsev ◽  
Danil N. Dybtsev ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Adsorption Selectivity ◽  
Ethylene Adsorption ◽  
Metal Organic ◽  
Mesoporous Metal

scholarly journals Screening metal–organic frameworks for mixture separations in fixed-bed adsorbers using a combined selectivity/capacity metric

RSC Advances ◽  
2017 ◽  
Vol 7 (57) ◽  
pp. 35724-35737 ◽  
Author(s):  
Rajamani Krishna
Keyword(s):  
Metal Organic Frameworks ◽  
Fixed Bed ◽  
Metal Organic

For screening purposes, mixture separations with MOFs are evaluated on the basis of a combined selectivity/capacity metric.

Two metal–organic frameworks based on a flexible benzimidazole carboxylic acid ligand: selective gas sorption and luminescence

2017 ◽  
Vol 46 (43) ◽  
pp. 15118-15123 ◽  
Author(s):  
Fang Zhang ◽  
Lei Hou ◽  
Wenyan Zhang ◽  
Yangtian Yan ◽  
Yunlong Wu ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Metal Organic Frameworks ◽  
Gas Sorption ◽  
Adsorption Selectivity ◽  
Flexible Ligand ◽  
Acid Ligand ◽  
Strong Luminescence ◽  
Metal Organic ◽  
Carboxylic Acid Ligand

Two new 3D frameworks with a novel (3,4,7)-connected trinodal net and (3,6)-connected binodal net were obtained by using a flexible ligand, showing significant adsorption selectivity for CO2 over CH4 as well as strong luminescence.

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