One-step enhancement of solvent transport, stability and photocatalytic properties of graphene oxide/polyimide membranes with multifunctional cross-linkers

2019 ◽  
Vol 7 (7) ◽  
pp. 3170-3178 ◽  
Author(s):  
Mei-Ling Liu ◽  
Jia-Lin Guo ◽  
Susilo Japip ◽  
Tian-Zhi Jia ◽  
Dan-Dan Shao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photocatalytic Performance ◽  
Composite Membranes ◽  
Photocatalytic Properties ◽  
Cross Linking ◽  
One Step ◽  
The Stability ◽  
Solvent Transport ◽  
Polyimide Membranes

Improving the stability and photocatalytic performance of GO/PI composite membranes by a one-step cross-linking method.

An investigation into the solar light-driven enhanced photocatalytic properties of a graphene oxide–SnO2–TiO2ternary nanocomposite

RSC Advances ◽  
2016 ◽  
Vol 6 (38) ◽  
pp. 32074-32088 ◽  
Author(s):  
Aniket Kumar ◽  
Lipeeka Rout ◽  
L. Satish K. Achary ◽  
Anurag Mohanty ◽  
Rajendra S. Dhaka ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Energy Levels ◽  
Band Edge ◽  
Photocatalytic Properties ◽  
Solar Light ◽  
Highly Efficient ◽  
Ternary Nanocomposite ◽  
One Step

Highly efficient graphene oxide–SnO2–TiO2ternary nanocomposite was designedviaone step solvothermal method considering the step-wise band edge energy levels of each component and the corresponding photocatalytic performance was investigated.

scholarly journals Chemically Cross-Linked Graphene Oxide as a Selective Layer on Electrospun Polyvinyl Alcohol Nanofiber Membrane for Nanofiltration Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2867
Author(s):  
Myoung Jun Park ◽  
Grace M. Nisola ◽  
Dong Han Seo ◽  
Chen Wang ◽  
Sherub Phuntsho ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Self Assembly ◽  
Water Flux ◽  
Composite Membranes ◽  
Cross Linking ◽  
Support Surface ◽  
Eosin Y ◽  
Selective Layer ◽  
Assembly Technique

Graphene oxide (GO) nanosheets were utilized as a selective layer on a highly porous polyvinyl alcohol (PVA) nanofiber support via a pressure-assisted self-assembly technique to synthesize composite nanofiltration membranes. The GO layer was rendered stable by cross-linking the nanosheets (GO-to-GO) and by linking them onto the support surface (GO-to-PVA) using glutaraldehyde (GA). The amounts of GO and GA deposited on the PVA substrate were varied to determine the optimum nanofiltration membrane both in terms of water flux and salt rejection performances. The successful GA cross-linking of GO interlayers and GO-PVA via acetalization was confirmed by FTIR and XPS analyses, which corroborated with other characterization results from contact angle and zeta potential measurements. Morphologies of the most effective membrane (CGOPVA-50) featured a defect-free GA cross-linked GO layer with a thickness of ~67 nm. The best solute rejections of the CGOPVA-50 membrane were 91.01% for Na2SO4 (20 mM), 98.12% for Eosin Y (10 mg/L), 76.92% for Methylene blue (10 mg/L), and 49.62% for NaCl (20 mM). These findings may provide one of the promising approaches in synthesizing mechanically stable GO-based thin-film composite membranes that are effective for solute separation via nanofiltration.

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.

Preparation of Stable Hydrophilic Polyethyleneimine Cross-Linked Graphene Oxide/Titanium Dioxide Membranes for Dye Separation

NANO ◽  
2021 ◽  
pp. 2150008
Author(s):  
Hongwei Liu ◽  
Jinhua Liu ◽  
Jun Li ◽  
Zhanchao Liu ◽  
Weifu Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Graphene Oxide ◽  
Water Flux ◽  
Cross Linking ◽  
Sunset Yellow ◽  
Water Contact ◽  
Static Water ◽  
The Cross ◽  
The Stability

An excellent novel laminar and hierarchical polyethyleneimine cross-linked graphene oxide/titanium dioxide (GO–TiO2–PEI) membrane was successfully prepared by vacuum filtration technology using polyethyleneimine (PEI) as the cross-linking agent and a GO–TiO2 nanocomposite as the substrate. The resultant membrane (GO–TiO2–PEI) displayed a favorable antifouling performance with bovine serum albumin (BSA) and showed good hydrophilicity and wettability, with a static water contact angle of 13.2∘. The stability of the GO–TiO2–PEI membrane in aqueous solution obviously improved with the cross-linking of PEI compared with that of the GO and GO–TiO2 membranes. The GO–TiO2–PEI membrane also exhibited a satisfactory water flux of 48.6[Formula: see text]L m[Formula: see text] h[Formula: see text] bar[Formula: see text]. The GO–TiO2–PEI membrane exhibited a good performance for effectively separating different dyes including methylene blue (MB), rhodamine B (RB), methyl orange (MO), sunset yellow (SY), new coccine (NC) and amaranth. All the above results suggested that the GO–TiO2–PEI membrane could be used as an excellent stable hydrophilic membrane for efficiently separating dyes from aqueous solution.

Cross-Linked PIM-1 Membranes with Improved Stability to Aromatics

2020 ◽  
Vol 869 ◽  
pp. 431-436
Author(s):  
Alexey A. Yushkin ◽  
Alexey V. Balynin ◽  
Danila S. Bakhtin ◽  
Richard Kirk ◽  
Peter M. Budd ◽  
...  
Keyword(s):  
Aromatic Hydrocarbons ◽  
Solubility Parameter ◽  
Composite Membranes ◽  
Cross Linking ◽  
Selective Layer ◽  
Aromatic Solvents ◽  
Improved Stability ◽  
The Stability ◽  
Distance Parameter ◽  
Hansen Solubility

Composite membranes were prepared for nanofiltration of aromatic solvents. Cross-linking with AlCl3 was used to improve the stability of the PIM-1 selective layer in aromatic solvents like toluene, benzene and xylene. Nanofiltration performances of obtained membranes were tested with 4 different aromatic hydrocarbons and with 3 solvents from other classes of solvents. Obtained permeability for aromatic hydrocarbons was above 8,5 kg/m2·h·bar and retention of Remazol brilliant blue R dye with molecular mass 626 was up to 96 %. It was shown that permeability results correlated with Hansen solubility parameter and distance parameter between polymer and solvent. PIM-1 has higher permeability for non-polar hydrocarbons due to higher affinity between polymer and solvent.

A cross-linking graphene oxide–polyethyleneimine hybrid film containing ciprofloxacin: one-step preparation, controlled drug release and antibacterial performance

2015 ◽  
Vol 3 (8) ◽  
pp. 1605-1611 ◽  
Author(s):  
Tiefan Huang ◽  
Lin Zhang ◽  
Huanlin Chen ◽  
Congjie Gao
Keyword(s):  
Drug Delivery ◽  
Graphene Oxide ◽  
Drug Release ◽  
Hybrid Film ◽  
Controlled Drug Release ◽  
Cross Linking ◽  
Antibacterial Performance ◽  
One Step ◽  
Novel Drug Delivery System ◽  
Novel Drug

A graphene oxide film was cross-linked by polyethyleneimine as a novel drug delivery system which showed excellent antibacterial performance.

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