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.

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 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 Investigating the Antibacterial Activity of Polymeric Membranes Fabricated with Aminated Graphene Oxide

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 510
Author(s):  
Muhammad Zahid ◽  
Saba Akram ◽  
Anum Rashid ◽  
Zulfiqar Ahmad Rehan ◽  
Talha Javed ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Mechanical Stability ◽  
Water Flux ◽  
Composite Membranes ◽  
Inversion Method ◽  
Cellulose Acetate Membrane ◽  
Functionalized Graphene Oxide ◽  
And Performance ◽  
Phase Inversion Method

A novel, functionalized graphene oxide–based cellulose acetate membrane was fabricated using the phase inversion method to improve the membrane characteristics and performance. We studied the effect of aminated graphene oxide (NH2–GO) composite on the CA membrane characteristics and performance in terms of membrane chemistry, hydrophilicity, thermal and mechanical stability, permeation flux, and antibacterial activity. The results of contact angle and water flux indicate the improved hydrophilic behavior of composite membranes in comparison to that of the pure CA membrane. The AGO-3 membrane showed the highest water flux of about 153 Lm−2h−1. The addition of hydrophilic AGO additive in CA membranes enhanced the antibacterial activity of AGO–CA membranes, and the thermal stability of the resulting membrane also improved since it increases the Tg value in comparison to that of a pristine CA membrane. The aminated graphene oxide (NH2–GO) was, therefore, found to be a promising additive for the fabrication of composite membranes with potent applications in wastewater treatment.

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.

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 PMMA-MWNTS LOADING ON CO2 SEPARATION PERFORMANCE OF THIN FILM NANOCOMPOSITE MEMBRANE

2016 ◽  
Vol 78 (12) ◽  
Author(s):  
Wong Kar Chun ◽  
Goh Pei Sean ◽  
Ahmad Fauzi Ismail
Keyword(s):  
Thin Film ◽  
Carbon Capture ◽  
Interfacial Polymerization ◽  
Carbon Capture And Storage ◽  
Gas Permeation ◽  
Nanocomposite Membrane ◽  
Separation Performance ◽  
Feed Pressure ◽  
Multi Walled Carbon Nanotubes ◽  
Thin Film Nanocomposite

Nanocomposite membrane, especially the thin film nanocomposite (TFN) fabricated via interfacial polymerization (IP) is a relatively new class of membrane which features good separation performance and practical processing. This study investigated on the effects of multi-walled carbon nanotubes (MWNTs) loading on the gas separation performance of the resultant TFNs. TFNs were tested with pure CO2, N2 and CH4 gases at feed pressure of 2 bar. The findings from this study suggested that the optimum fillers loading was around 0.25 g/L in the coating solution which gives TFN with CO2 permeance of 53.5 gas permeation unit (GPU) (12% higher than base membrane without filler), CO2/N2 selectivity of 61 and CO2/CH4 selectivity of 35. The enhancement in CO2 permeance without sacrificing the membrane selectvities was attributed to the good dispersion and compatibility of the MWNTs with the polymer matrix while the nanotubes serve as rapid diffusion channels to facilitate transport of gases. TFN embedded with polymethyl methacrylate (PMMA)-MWNTs showed potential for low pressure carbon capture and storage application.  

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.

scholarly journals Pebax® 2533/Graphene Oxide Nanocomposite Membranes for Carbon Capture

Membranes ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 188 ◽  
Author(s):  
Riccardo Casadei ◽  
Marco Giacinti Baschetti ◽  
Myung Jin Yoo ◽  
Ho Bum Park ◽  
Loris Giorgini
Keyword(s):  
Graphene Oxide ◽  
Carbon Capture ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Different Types ◽  
Upstream Pressure ◽  
Selective Membrane ◽  
Very High ◽  
Matrix Membranes

In this work, the behavior of new GO-based mixed matrix membranes was tested in view of their use as CO2-selective membrane in post combustion carbon capture applications. In particular, the new materials were obtained by mixing of Pebax® 2533 copolymer with different types of graphene oxide (GO). Pebax® 2533 has indeed lower selectivity, but higher permeability than Pebax® 1657, which is more commonly used for membranes, and it could therefore benefit from the addition of GO, which is endowed with very high selectivity of CO2 with respect to nitrogen. The mixed matrix membranes were obtained by adding different amounts of GO, from 0.02 to 1% by weight, to the commercial block copolymers. Porous graphene oxide (PGO) and GO functionalized with polyetheramine (PEAGO) were also considered in composites produced with similar procedure, with a loading of 0.02%wt. The obtained films were then characterized by using SEM, DSC, XPS analysis and permeability experiments. In particular, permeation tests with pure CO2 and N2 at 35°C and 1 bar of upstream pressure were conducted for the different materials to evaluate their separation performance. It has been discovered that adding these GO-based nanofillers to Pebax® 2533 matrix does not improve the ideal selectivity of the material, but it allows to increase CO2 permeability when a low filler content, not higher than 0.02 wt%, is considered. Among the different types of GO, then, porous GO seems the most promising as it shows CO2 permeability in the order of 400 barrer (with an increase of about 10% with respect to the unloaded block copolymer), obtained without reducing the CO2/N2 selectivity of the materials, which remained in the order of 25.

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