Heterostructured graphene oxide membranes with tunable water-capture coatings for highly selective water permeation

2021 ◽  
Author(s):  
Zhiming Zhang ◽  
Hong Wu ◽  
Ying Li ◽  
Yue Liu ◽  
Chenliang Cao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Water Transport ◽  
Great Promise ◽  
Separation Performance ◽  
Water Permeation ◽  
Membrane Surfaces ◽  
Molecular Separations ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes

Graphene oxide (GO) laminar membranes with fast water-transport nanochannels hold great promise for water-selective molecular separations, but the water-capture ability of membrane surfaces limits the separation performance. Herein, we engineered...

Improving the hydrogen selectivity of graphene oxide membranes by reducing non-selective pores with intergrown ZIF-8 crystals

2016 ◽  
Vol 52 (52) ◽  
pp. 8087-8090 ◽  
Author(s):  
Xuerui Wang ◽  
Chenglong Chi ◽  
Jifang Tao ◽  
Yongwu Peng ◽  
Shaoming Ying ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Gas Separation ◽  
Separation Performance ◽  
Hydrogen Selectivity ◽  
Oxide Membranes ◽  
Gas Separation Performance ◽  
Graphene Oxide Membranes

The large defects of graphene oxide membranes were reduced by the intergrown ZIF-8 crystals, affording dramatically increased gas separation performance.

Effects of Edge Functional Groups on Water Transport in Graphene Oxide Membranes

2019 ◽  
Vol 11 (8) ◽  
pp. 8483-8491 ◽  
Author(s):  
Ruosang Qiu ◽  
Shi Yuan ◽  
Jie Xiao ◽  
Xiao Dong Chen ◽  
Cordelia Selomulya ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
Water Transport ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes

Study on the separation performance of the multi-channel reduced graphene oxide membranes

2016 ◽  
Vol 384 ◽  
pp. 279-286 ◽  
Author(s):  
Yongjiao Zhao ◽  
Chun Li ◽  
Xiaoyan Fan ◽  
Jiesheng Wang ◽  
Guang Yuan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Separation Performance ◽  
Reduced Graphene ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes

scholarly journals Water/Alcohol Separation in Graphene Oxide Membranes: Insights from Molecular Dynamics and Monte Carlo Simulations

MRS Advances ◽  
2018 ◽  
Vol 3 (1-2) ◽  
pp. 109-114 ◽  
Author(s):  
Daiane Damasceno Borges ◽  
Cristiano F. Woellner ◽  
Pedro A. S. Autreto ◽  
Douglas S. Galvao
Keyword(s):  
Molecular Dynamics ◽  
Graphene Oxide ◽  
Functional Groups ◽  
Water Molecules ◽  
Pristine Graphene ◽  
Strong Impact ◽  
Water Permeation ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes ◽  
Water Alcohol

ABSTRACTGraphene-based membranes have been investigated as promising candidates for water filtration and gas separation applications. Experimental evidences have shown that graphene oxide can be impermeable to liquids, vapors and gases, while allowing a fast permeation of water molecules. This phenomenon has been attributed to the formation of a network of nano capillaries that allow nearly frictionless water flow while blocking other molecules by steric hindrance effects. It is supposed that water molecules are transported through the percolated two-dimensional channels formed between graphene-based sheets. Although these channels allow fast water permeation in such materials, the flow rates are strongly dependent on how the membranes are fabricated. Also, some fundamental issues regarding the nanoscale mechanisms of water permeation are still not fully understood and their interpretation remains controversial. In this work, we have investigated the dynamics of water permeation through pristine graphene and graphene oxide model membranes that have strong impact on water/alcohol separation. We have carried out fully atomistic classical molecular dynamics simulations of systems composed of multiple layered graphene-based sheets into contact with a pure water reservoir under controlled thermodynamics conditions (e. g., by varying temperature and pressure values). We have systematically analysed how the transport dynamics of the confined nanofluids depend on the interlayer distances and the role of the oxide functional groups. Our results show the water flux is much more effective for graphene than for graphene oxide membranes. These results can be attributed to the H-bonds formation between oxide functional groups and water, which traps the water molecules and precludes ultrafast water transport through the nanochannels.

scholarly journals Understanding Water Permeation in Graphene Oxide Membranes

2014 ◽  
Vol 6 (8) ◽  
pp. 5877-5883 ◽  
Author(s):  
Ning Wei ◽  
Xinsheng Peng ◽  
Zhiping Xu
Keyword(s):  
Graphene Oxide ◽  
Water Permeation ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes
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