Efficient dehydration of the organic solvents through graphene oxide (GO)/ceramic composite membranes

RSC Advances ◽  
2014 ◽  
Vol 4 (94) ◽  
pp. 52012-52015 ◽  
Author(s):  
Guihua Li ◽  
Lei Shi ◽  
Gaofeng Zeng ◽  
Yanfeng Zhang ◽  
Yuhan Sun
Keyword(s):  
Graphene Oxide ◽  
Mechanical Strength ◽  
Organic Solvents ◽  
Ceramic Composite ◽  
Composite Membranes ◽  
Separation Performance ◽  
Deposition Method ◽  
Solvent Water ◽  
High Separation

Al2O3 tube supported GO composite membranes with submicron thickness and improved mechanical strength were fabricated via a filter-pressing deposition method. High separation performance was achieved in the pervaporation of solvent–water mixtures.

Polyvinylamine/graphene oxide/PANI@CNTs mixed matrix composite membranes with enhanced CO2/N2 separation performance

2019 ◽  
Vol 589 ◽  
pp. 117246 ◽  
Author(s):  
Yonghong Wang ◽  
Long Li ◽  
Xinru Zhang ◽  
Jinping Li ◽  
Chengcen Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Matrix Composite ◽  
Composite Membranes ◽  
Separation Performance ◽  
Mixed Matrix

scholarly journals Cross-Linking With Diamine Monomers to Prepare Graphene Oxide Composite Membranes With Varying D-Spacing for Enhanced Desalination Properties

2021 ◽  
Vol 9 ◽  
Author(s):  
Hong Ju ◽  
Jinzhuo Duan ◽  
Haitong Lu ◽  
Weihui Xu
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Water Flux ◽  
Covalent Bond ◽  
Composite Membranes ◽  
Rejection Rate ◽  
High Water ◽  
Cross Linking ◽  
Separation Performance ◽  
X Ray

As a new type of membrane material, graphene oxide (GO) can easily form sub-nanometer interlayer channels, which can effectively screen salt ions. The composite membrane and structure with a high water flux and good ion rejection rate were compared by the cross-linking of GO with three different diamine monomers: ethylenediamine (EDA), urea (UR), and p-phenylenediamine (PPD). X-ray photoelectron spectroscopy (XPS) results showed that unmodified GO mainly comprises π-π interactions and hydrogen bonds, but after crosslinking with diamine, both GO and mixed cellulose (MCE) membranes are chemically bonded to the diamine. The GO-UR/MCE membrane achieved a water flux similar to the original GO membrane, while the water flux of GO-PPD/MCE and GO-EDA/MCE dropped. X-ray diffraction results demonstrated that the covalent bond between GO and diamine can effectively inhibit the extension of d-spacing during the transition between dry and wet states. The separation performance of the GO-UR/MCE membrane was the best. GO-PPD/MCE had the largest contact angle and the worst hydrophilicity, but its water flux was still greater than GO-EDA/MCE. This result indicated that the introduction of different functional groups during the diamine monomer cross-linking of GO caused some changes in the performance structure of the membrane.

scholarly journals Polyvinylamine Membranes Containing Graphene-Based Nanofillers for Carbon Capture Applications

Membranes ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 119 ◽  
Author(s):  
Casadei ◽  
Venturi ◽  
Giacinti Baschetti ◽  
Giorgini ◽  
Maccaferri ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Capture ◽  
Mechanical Stability ◽  
Composite Membranes ◽  
Sem Analysis ◽  
Gas Permeation ◽  
Separation Performance ◽  
Low Grade ◽  
Atr Spectroscopy ◽  
Few Layer Graphene

In the present study, the separation performance of new self-standing polyvinylamine (PVAm) membranes loaded with few-layer graphene (G) and graphene oxide (GO) was evaluated, in view of their use in carbon capture applications. PVAm, provided by BASF as commercial product named LupaminTM, was purified obtaining PVAm films with two degrees of purification: Low Grade (PVAm-LG) and High Grade (PVAm-HG). These two-grade purified PVAm were loaded with 3 wt% of graphene and graphene oxide to improve mechanical stability: indeed, pristine tested materials proved to be brittle when dry, while highly susceptible to swelling in humid conditions. Purification performances were assessed through FTIR-ATR spectroscopy, DSC and TGA analysis, which were carried out to characterize the pristine polymer and its nanocomposites. In addition, the membranes′ fracture surfaces were observed through SEM analysis to evaluate the degree of dispersion. Water sorption and gas permeation tests were performed at 35 °C at different relative humidity (RH), ranging from 50% to 95%. Overall, composite membranes showed improved mechanical stability at high humidity, and higher glass transition temperature (Tg) with respect to neat PVAm. Ideal CO2/N2 selectivity up to 80 was measured, paired with a CO2 permeability of 70 Barrer. The membranes’ increased mechanical stability against swelling, even at high RH, without the need of any crosslinking, represents an interesting result in view of possible further development of new types of facilitated transport composite membranes.

scholarly journals Reduced graphene oxide–metal nanoparticle composite membranes for environmental separation and chloro-organic remediation

RSC Advances ◽  
2019 ◽  
Vol 9 (66) ◽  
pp. 38547-38557 ◽  
Author(s):  
Ashish Aher ◽  
Samuel Thompson ◽  
Trisha Nickerson ◽  
Lindell Ormsbee ◽  
Dibakar Bhattacharyya
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Organic Contaminants ◽  
Composite Membranes ◽  
Metal Nanoparticle ◽  
Separation Performance ◽  
Oxidation Reactions ◽  
Heterogeneous Oxidation ◽  
Reduced Graphene

This study explores the integration of separation performance was achieved in a loose nanofiltration regime with heterogeneous oxidation reactions for remediation of organic contaminants from water.

scholarly journals CO2 Separation with Polymer/Aniline Composite Membranes

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1363
Author(s):  
Hwa Jin Lee ◽  
Sang Wook Kang
Keyword(s):  
Benzene Ring ◽  
Polymer Matrix ◽  
Composite Membranes ◽  
Separation Performance ◽  
Amino Group ◽  
Sem Images ◽  
Ft Ir ◽  
High Separation ◽  
Ft Ir Spectroscopy

Polymer composite membranes containing aniline were prepared for CO2/N2 separation. Aniline was selected for high separation performance as an additive containing both the benzene ring to interfere with gas transport and an amino group that could induce the accelerated transport of CO2 molecules. As a result, when aniline having both a benzene ring and an amino group was incorporated into polymer membranes, the selectivity was largely enhanced by the role of both gas barriers and CO2 carriers. Selective layers coated on the polysulfone were identified by scanning electron microscopy (SEM) images and the interaction with aniline in the polymer matrix was confirmed by FT-IR spectroscopy. The binding energy of oxygen in the polymer matrix was investigated by XPS, and the thermal stability of the composite membrane was confirmed by TGA.

A Novel Strategy to Fabricate Cation-Cross-linked Graphene Oxide Membrane with High Aqueous Stability and High Separation Performance

2020 ◽  
Vol 12 (50) ◽  
pp. 56269-56280
Author(s):  
Xing-Bin Lv ◽  
Rui Xie ◽  
Jun-Yi Ji ◽  
Zhuang Liu ◽  
Xiao-Yu Wen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Separation Performance ◽  
Novel Strategy ◽  
Oxide Membrane ◽  
High Separation

Enhancing the CO2 separation performance of composite membranes by the incorporation of amino acid-functionalized graphene oxide

2015 ◽  
Vol 3 (12) ◽  
pp. 6629-6641 ◽  
Author(s):  
Qingping Xin ◽  
Zhao Li ◽  
Congdi Li ◽  
Shaofei Wang ◽  
Zhongyi Jiang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Amino Acid ◽  
Composite Membranes ◽  
Co2 Separation ◽  
Separation Performance ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Graphene Oxide Nanosheet

Amino acid-functionalized graphene oxide nanosheet-incorporated composite membranes significantly enhanced the CO2/CH4(N2) diffusivity, reactivity and solubility selectivities.

Effect of Microstructure of Graphene Oxide Fabricated Composite Membranes on Alcohol Dehydration

2014 ◽  
Vol 1051 ◽  
pp. 278-282 ◽  
Author(s):  
Wei Song Hung ◽  
Kueir Rarn Lee ◽  
Juin Yih Lai
Keyword(s):  
Graphene Oxide ◽  
Self Assembly ◽  
Driving Forces ◽  
Composite Membranes ◽  
The Self ◽  
Separation Performance ◽  
Permeation Flux ◽  
Laminate Structure ◽  
Alcohol Dehydration ◽  
Assembly Technique

We utilized pressure-, vacuum-, and evaporation-assisted self-assembly techniques through which graphene oxide (GO) was deposited on modified polyacrylonitrile (mPAN). The fabricated composite GO/mPAN membranes were applied to dehydrate 1-butanol mixtures by pervaporation. Varying driving forces in the self-assembly techniques induced different GO assembly layer microstructures. XRD results indicated that the GO layer d-spacing varied from 8.3 Å to 11.5 Å. The self-assembly technique with evaporation resulted in a heterogeneous GO layer with loop structures; this layer was shown to be hydrophobic, in contrast to the hydrophilic layer formed from the other two techniques. From the pressure-assisted technique, the composite membrane exhibited exceptional pervaporation performance at 30 °C: concentration of water at the permeate side = 99.6 wt% and permeation flux = 2.54 kg m-2 h-1. This excellent separation performance stemmed from the dense, highly ordered laminate structure of GO.

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