Two-dimensional metal−porphyrin framework membranes for efficient molecular sieving

2021 ◽  
Vol 640 ◽  
pp. 119812
Author(s):  
Peng Cheng ◽  
Yidi Huang ◽  
Chao Wu ◽  
Xiaoping Wang ◽  
Xiaorui Fu ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Metal Porphyrin ◽  
Molecular Sieving

A two-dimensional cationic covalent organic framework membrane for selective molecular sieving

2018 ◽  
Vol 6 (27) ◽  
pp. 13331-13339 ◽  
Author(s):  
Wenxiang Zhang ◽  
Liming Zhang ◽  
Haifeng Zhao ◽  
Bin Li ◽  
Heping Ma
Keyword(s):  
Two Dimensional ◽  
High Permeability ◽  
Covalent Organic Framework ◽  
Molecular Sieving ◽  
Organic Framework

A two-dimensional cationic covalent organic framework membrane with extraordinary separation properties and high permeability.

Interfacial self-assembled GR/GO ultrathin membranes on a large scale for molecular sieving

2020 ◽  
Vol 8 (36) ◽  
pp. 18735-18744 ◽  
Author(s):  
Junyuan Xia ◽  
Peng Xiao ◽  
Jincui Gu ◽  
Tianyu Chen ◽  
Chaohui Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lamellar Structure ◽  
Large Scale ◽  
Two Dimensional ◽  
Self Assembled ◽  
Molecular Sieving ◽  
Ultrathin Membranes

Graphene oxide (GO) has superior molecular sieving abilities due to its unimpeded two-dimensional (2D) nano-channels and nacre-like lamellar structure.

Stability, Molecular Sieving, and Ion Diffusion Selectivity of a Lamellar Membrane from Two-Dimensional Molybdenum Disulfide

Nano Letters ◽  
2017 ◽  
Vol 17 (4) ◽  
pp. 2342-2348 ◽  
Author(s):  
Mengmeng Deng ◽  
Kijeong Kwac ◽  
Meng Li ◽  
Yousung Jung ◽  
Hyung Gyu Park
Keyword(s):  
Molybdenum Disulfide ◽  
Two Dimensional ◽  
Ion Diffusion ◽  
Molecular Sieving

Electrocatalytic reduction of CO2 by two-dimensional transition metal porphyrin sheets

2019 ◽  
Vol 7 (19) ◽  
pp. 11944-11952 ◽  
Author(s):  
Jin-Hang Liu ◽  
Li-Ming Yang ◽  
Eric Ganz
Keyword(s):  
Transition Metal ◽  
Catalytic Performance ◽  
Two Dimensional ◽  
Electrocatalytic Reduction ◽  
Metal Porphyrin ◽  
Reduction Of Co2 ◽  
Excellent Catalytic Performance ◽  
Cu And Zn ◽  
Electrocatalytic Reduction Of Co2 ◽  
Monolayer Catalysts

The first transition metal series TM–PP monolayer catalysts exhibit excellent catalytic performance during the process of electroreduction of CO2. The products have 2e− CO (Sc, Mn and Ni), HCOOH (Cr, Fe, Co, Cu and Zn), 8e− CH4 (Ti and V), and the overpotential of the reaction can be as low as 0.127 V.

scholarly journals Reversed thermo-switchable molecular sieving membranes composed of two-dimensional metal-organic nanosheets for gas separation

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Xuerui Wang ◽  
Chenglong Chi ◽  
Kang Zhang ◽  
Yuhong Qian ◽  
Krishna M. Gupta ◽  
...  
Keyword(s):  
Gas Separation ◽  
Two Dimensional ◽  
Metal Organic ◽  
Molecular Sieving

Construction of graphene oxide based mixed matrix membranes with CO2-philic sieving gas-transport channels through strong π–π interactions

2018 ◽  
Vol 6 (37) ◽  
pp. 17854-17860 ◽  
Author(s):  
Shenzhen Cong ◽  
Hui Li ◽  
Xiangjian Shen ◽  
Jing Wang ◽  
Junyong Zhu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Gas Transport ◽  
Mixed Matrix Membranes ◽  
Two Dimensional ◽  
High Permeability ◽  
Mixed Matrix ◽  
Π Interactions ◽  
Technological Challenge ◽  
Transport Channels ◽  
Molecular Sieving

Two-dimensional nanomaterials can be used to create innovative membranes with high permeability and selectivity, but precise manipulation of laminar stacking and the construction of ordered, CO2-philic molecular sieving channels remains a technological challenge.

scholarly journals Quasi-Unidirectional Transport Bilayer Two-Dimensional Nanopores for Highly-Efficient Molecular Sieving

2021 ◽  
Vol 9 ◽  
Author(s):  
Chengzhen Sun ◽  
Cheng Liu ◽  
Kailin Luo ◽  
Bofeng Bai
Keyword(s):  
Hexagonal Boron Nitride ◽  
Single Layer ◽  
Molecular Transport ◽  
Single Layer Graphene ◽  
Porous Membranes ◽  
Two Dimensional ◽  
Gas Molecules ◽  
Dynamics Simulations ◽  
Two Sides ◽  
Molecular Sieving

Two-dimensional nanopores are very promising for high-permeance molecular sieving, but the molecular backflow from permeate-side to feed-side is not beneficial for improving molecular permeance. We study the quasi-unidirectional molecular transport through a graphene-hexagonal boron nitride bilayer nanopore, aiming to realize a high-permeance molecular sieving. Molecular dynamics simulations of CO2/CH4 separations show that the bilayer pore presents 3.7 times higher selectivity comparing to the single-layer graphene nanopore with the same size. The quasi-unidirectional molecular transport is attributed to the distinctive adsorption abilities of gas molecules on the two sides of bilayer nanopores and the inhibited molecular backflow from permeate-side to feed-side. This work provides a promising way to realize the ultra-permeable porous membranes with molecular permeance even higher than the single-layer atomic-thickness membranes.

scholarly journals Exponentially selective molecular sieving through angstrom pores

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
P. Z. Sun ◽  
M. Yagmurcukardes ◽  
R. Zhang ◽  
W. J. Kuang ◽  
M. Lozada-Hidalgo ◽  
...  
Keyword(s):  
Gas Transport ◽  
High Flow ◽  
Effective Diameter ◽  
Two Dimensional ◽  
Next Generation ◽  
Activation Barriers ◽  
Flow Rates ◽  
Low Intensity ◽  
Molecular Separation ◽  
Molecular Sieving

AbstractTwo-dimensional crystals with angstrom-scale pores are widely considered as candidates for a next generation of molecular separation technologies aiming to provide extreme, exponentially large selectivity combined with high flow rates. No such pores have been demonstrated experimentally. Here we study gas transport through individual graphene pores created by low intensity exposure to low kV electrons. Helium and hydrogen permeate easily through these pores whereas larger species such as xenon and methane are practically blocked. Permeating gases experience activation barriers that increase quadratically with molecules’ kinetic diameter, and the effective diameter of the created pores is estimated as ∼2 angstroms, about one missing carbon ring. Our work reveals stringent conditions for achieving the long sought-after exponential selectivity using porous two-dimensional membranes and suggests limits on their possible performance.

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