scholarly journals Ultra-Selective Polyamide Membrane from Metal Organic Framework Assembly Regulated Interfacial Polymerization for Desalination and Water Reuse

2021 ◽  
Author(s):  
Yue Wen ◽  
Ruobin Dai ◽  
Xuesong Li ◽  
Xingran Zhang ◽  
Xingzhong Cao ◽  
...  
Keyword(s):  
Water Reuse ◽  
Interfacial Polymerization ◽  
Metal Organic Framework ◽  
Heat Of Reaction ◽  
Potable Reuse ◽  
Metal Organic ◽  
Polyamide Membrane ◽  
High Rejection ◽  
Very High ◽  
Organic Framework

Abstract While reverse osmosis (RO) is the leading technology to address the challenge of water scarcity through desalination and potable reuse of wastewater, current RO membranes still fall short in rejecting certain harmful constituents from seawater (e.g., boron) and wastewater (e.g., N-nitrosodimethylamine, or NDMA). In this study, we develop an ultra-selective polyamide (PA) membrane via enhancing interfacial polymerization using amphiphilic metal-organic framework (MOF) nanoflakes. In this process, MOF nanoflakes horizontally aligned at the water/hexane interface to accelerate the transport of diamine monomers across the interface and conserve gas bubbles and heat of reaction near the interface. These mechanisms synergistically led to the formation of a crumpled PA nanofilm with an ultrathin intrinsic thickness of ~ 5 nm and a high cross-linking degree of ~ 97%. The resulting PA membrane delivered excellent desalination performance that is beyond the existing upper-bound of perm-selectivity, and exhibited very high rejection (> 90%) of boron and NDMA unmatched by state-of-the-art RO membranes.

Interfacial Polymerization of MOF “Monomer” to Fabricate Flexible and Thin Membrane for Molecular Separation with Ultrafast Water Transport

2021 ◽  
Author(s):  
Xiaolei Cui ◽  
Guodong Kong ◽  
Yang Feng ◽  
Longting Li ◽  
Weidong Fan ◽  
...  
Keyword(s):  
Water Transport ◽  
Interfacial Polymerization ◽  
Metal Organic Framework ◽  
Thin Membrane ◽  
Selective Transport ◽  
Molecular Separation ◽  
Thin Membranes ◽  
Metal Organic ◽  
Facile Fabrication ◽  
Organic Framework

Metal-organic framework (MOF) membranes with sub-nanometer channels have great potential in molecule selective transport, but the scalable and facile fabrication of flexible and thin membranes from stable MOF structures is...

From Metal–Organic Framework to Nanoporous Carbon: Toward a Very High Surface Area and Hydrogen Uptake

2011 ◽  
Vol 133 (31) ◽  
pp. 11854-11857 ◽  
Author(s):  
Hai-Long Jiang ◽  
Bo Liu ◽  
Ya-Qian Lan ◽  
Kentaro Kuratani ◽  
Tomoki Akita ◽  
...  
Keyword(s):  
Surface Area ◽  
Metal Organic Framework ◽  
High Surface ◽  
High Surface Area ◽  
Hydrogen Uptake ◽  
Nanoporous Carbon ◽  
Metal Organic ◽  
Very High ◽  
Organic Framework

Controlled stepwise synthesis of a Cu-MOF: Transmetallation of a magnesium precursor to a three-dimensional framework with very high solvent content

2017 ◽  
Vol 232 (11) ◽  
Author(s):  
Qianqian Guo ◽  
Ulli Englert
Keyword(s):  
Metal Organic Framework ◽  
Three Dimensional ◽  
Copper Metal ◽  
Stepwise Synthesis ◽  
Solvent Content ◽  
Precursor Complex ◽  
Metal Organic ◽  
Very High ◽  
Ditopic Ligand ◽  
Organic Framework

AbstractA copper metal-organic framework (MOF) was synthesized by transmetalation. The ditopic ligand 3-(3,5-dimethyl-pyrazol-4-yl)pentane-2,4-dione is introduced via its Mg precursor complex in which it is oxygen-coordinated. After transmetallation, the ligand acts as

Multifunctional metal–organic framework heterostructures for enhanced cancer therapy

2021 ◽  
Author(s):  
Jintong Liu ◽  
Jing Huang ◽  
Lei Zhang ◽  
Jianping Lei
Keyword(s):  
Cancer Therapy ◽  
General Principle ◽  
Biomedical Applications ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Functional Modulation ◽  
Organic Framework

We review the general principle of the design and functional modulation of nanoscaled MOF heterostructures, and biomedical applications in enhanced therapy.

Magnetic Ordering via Itinerant Ferromagnetism in a Metal-Organic Framework

2020 ◽  
Author(s):  
Jesse Park ◽  
Brianna Collins ◽  
Lucy Darago ◽  
Tomce Runcevski ◽  
Michael Aubrey ◽  
...  
Keyword(s):  
Charge Transport ◽  
Magnetic Order ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Double Exchange ◽  
Itinerant Ferromagnetism ◽  
Organic Solids ◽  
Metal Organic ◽  
Organic Framework

<b>Materials that combine magnetic order with other desirable physical attributes offer to revolutionize our energy landscape. Indeed, such materials could find transformative applications in spintronics, quantum sensing, low-density magnets, and gas separations. As a result, efforts to design multifunctional magnetic materials have recently moved beyond traditional solid-state materials to metal–organic solids. Among these, metal–organic frameworks in particular bear structures that offer intrinsic porosity, vast chemical and structural programmability, and tunability of electronic properties. Nevertheless, magnetic order within metal–organic frameworks has generally been limited to low temperatures, owing largely to challenges in creating strong magnetic exchange in extended metal–organic solids. Here, we employ the phenomenon of itinerant ferromagnetism to realize magnetic ordering at <i>T</i><sub>C</sub> = 225 K in a mixed-valence chromium(II/III) triazolate compound, representing the highest ferromagnetic ordering temperature yet observed in a metal–organic framework. The itinerant ferromagnetism is shown to proceed via a double-exchange mechanism, the first such observation in any metal–organic material. Critically, this mechanism results in variable-temperature conductivity with barrierless charge transport below <i>T</i><sub>C</sub> and a large negative magnetoresistance of 23% at 5 K. These observations suggest applications for double-exchange-based coordination solids in the emergent fields of magnetoelectrics and spintronics. Taken together, the insights gleaned from these results are expected to provide a blueprint for the design and synthesis of porous materials with synergistic high-temperature magnetic and charge transport properties. </b>

Solvent-Free Powder Synthesis and MOF-CVD Thin Films of the Mesoporous Metal-Organic Framework MAF-6

2019 ◽  
Author(s):  
Timothée Stassin ◽  
Ivo Stassen ◽  
Joao Marreiros ◽  
Alexander John Cruz ◽  
Rhea Verbeke ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Metal Organic Framework ◽  
Chemical Vapor ◽  
Uptake Capacity ◽  
Powder Synthesis ◽  
Crystalline Films ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
First Time ◽  
Organic Framework

A simple solvent- and catalyst-free method is presented for the synthesis of the mesoporous metal-organic framework (MOF) MAF-6 (RHO-Zn(eIm)2) based on the reaction of ZnO with 2-ethylimidazole vapor at temperatures ≤ 100 °C. By translating this method to a chemical vapor deposition (CVD) protocol, mesoporous crystalline films could be deposited for the first time entirely from the vapor phase. A combination of PALS and Kr physisorption measurements confirmed the porosity of these MOF-CVD films and the size of the MAF-6 supercages (diam. ~2 nm), in close agreement with powder data and calculations. MAF-6 powders and films were further characterized by XRD, TGA, SEM, FTIR, PDF and EXAFS. The exceptional uptake capacity of the mesoporous MAF-6 in comparison to the microporous ZIF-8 is demonstrated by vapor-phase loading of a molecule larger than the ZIF-8 windows.

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