Fabrication of positively charged nanofiltration membrane via the layer-by-layer assembly of graphene oxide and polyethylenimine for desalination

Qian, Nan; Li, Yuan; Cao, Bing

doi:10.1016/j.apsusc.2016.06.150

Cited by 201 publications

(83 citation statements)

References 47 publications

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“…2,[15][16][17][18][19][20][21][22] These physicochemical changes can lead to changes in their permeability and selectivity. Since pH is a crucial parameter and easy to be adjusted in membrane separations, pH-responsive membranes have attracted great attention.…”

Section: -3mentioning

confidence: 99%

pH-Responsive nanofiltration membranes based on porphyrin supramolecular self-assembly by layer-by-layer technique

Zhao

Zhang

2017

RSC Adv.

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A novel pH-responsive nanofiltration membrane was fabricated by means of layer-by-layer (LbL) technique based on porphyrin supramolecular self-assembly. The multilayer membrane was prepared on a hydrolyzed poly(acrylonitrile) (PAN) support membrane, and was composed of poly(allylamine hydrochloride) (PAH) as a polycation and poly(styrene sulfonate) (PSS) as a polyanion and 5,10,15,20-tetrakis-(4-sulfonatophenyl)-porphyrin (TPPS) as the pH-responsive functional supramolecular. Aggregation of TPPS and the shielding effect of salt in solution affected the adsorption of TPPS onto the membrane, while the higher ionization degree of the oppositely charged membrane with PAH favored the adsorption of TPPS. A coil structure of polyelectrolytes caused by the lower ionization degree of PAH or by the shielding effect of salt led to higher adsorption of polyelectrolytes on the membrane. The LbL assembly membrane showed higher and pH-responsive water flux and salt rejection compared with that without TPPS. At pH 1.0, TPPS assembled into J-aggregates on the membrane surface, and the membrane showed relatively lower water flux and higher rejection. When the pH value was increased above 2.0, TPPS transformed into H-aggregates and monomers, and the membrane showed relatively higher water flux and lower salt rejection.

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Section: -3mentioning

confidence: 99%

pH-Responsive nanofiltration membranes based on porphyrin supramolecular self-assembly by layer-by-layer technique

Zhao

Zhang

2017

RSC Adv.

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“…The GO contains polar groups which can easily interact with water molecules and it increases the hydrophilicity of the membrane and diffusion rate of permeate side [31,32]. The water selectivity is improved via the presence of the GO functional groups [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Pervaporation dehydration of bio-fuel (n-butanol) by dry thermal treatment membrane

Manshad

Isloor

Nawawi

et al. 2020

Mater. Res. Express

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In the present investigation, laboratory synthesized graphene oxide (GO) as a nano-filler was used in polyetherimide (PEI) flat-sheet membranes (PM). The PEI flat-sheet membrane was fabricated through a dry-thermal treatment (DTT) method. The effects of fabrication method were investigated on polyetherimide-GO membrane prepared by dry-thermal treatment (PMDTT). The morphological structure was investigated via different characterization; Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), contact angle measurement and Raman spectra. The results indicated that, the hybrid PMDTT membrane displayed reasonably better pervaporation separation performance in comparison to neat PMDTT membranes. The concentrations of water at the permeate side of hybrid and neat PMDTT membrane were 99.3 and 90.9 wt.%, respectively. Hybrid membranes showed a 78.3% enhanced permeation rate. Enhancement of pervaporation property of hybrid PMDTT membrane could be ascribed mainly due to the presence of graphene oxide in the dense top layer. Overall, the blending of graphene oxide in hybrid PMDTT membranes could be a promising approach for enhancing the pervaporation properties of the membranes.

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“…To reach this goal, an LMR optical fiber ethanol sensor based on a sputtered SnO2 coating [6] has been fabricated and characterized. Then, it has been modified by depositing a multilayer coating including polyethyleneimine (PEI) and GO onto the SnO2 layer following the layer-by-layer (LbL) technique described in [7]. Finally, this device has been also characterized and both responses have been compared in terms of sensitivity, linearity and hysteresis.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity enhancement of lossy mode resonance-based ethanol sensors by graphene oxide coatings

Hernáez¹,

Mayes²,

Melendi-Espina

2017

2017 Ieee Sensors

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A layer by layer (LbL) coating made of polyethyleneimine (PEI) and graphene oxide (GO) is deposited onto an optical fiber ethanol sensor based on lossy mode resonances (LMR) in order to improve its response. The new sensor including the PEI/GO coating shows a better linearity and a sensitivity four times higher than the sensor without the coating. To our knowledge, this is the first time that a LbL coating made of PEI and GO is included in an optical fiber sensor based on LMR.

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Fabrication of positively charged nanofiltration membrane via the layer-by-layer assembly of graphene oxide and polyethylenimine for desalination

Cited by 201 publications

References 47 publications

pH-Responsive nanofiltration membranes based on porphyrin supramolecular self-assembly by layer-by-layer technique

pH-Responsive nanofiltration membranes based on porphyrin supramolecular self-assembly by layer-by-layer technique

Pervaporation dehydration of bio-fuel (n-butanol) by dry thermal treatment membrane

Sensitivity enhancement of lossy mode resonance-based ethanol sensors by graphene oxide coatings

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