Polyvinylpyrrolidone modified graphene oxide as a modifier for thin film composite forward osmosis membranes

Wu, Xing; Field, Robert W.; Wu, Jun; Zhang, Kaisong

doi:10.1016/j.memsci.2017.06.070

Cited by 90 publications

(37 citation statements)

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“…GO is known to have many hydrophilic groups that helps to increase the membrane hydrophilicity and aid the formation of internal pore channels during membrane fabrication. Therefore, the addition of GO improved the adsorption of water molecules on the membrane surface and possibly increased the diffusion rate of water molecules passing through the membrane . The flux of bare FS and bare HF membranes was observed to increase from 39.55 to 77.22 L m −2 h −1 and 77.46 to 236 L m −2 h −1 , respectively at 2 bar.…”

Section: Resultsmentioning

confidence: 93%

“…Therefore, the addition of GO improved the adsorption of water molecules on the membrane surface and possibly increased the diffusion rate of water molecules passing through the membrane. 54 The flux of bare FS and bare HF membranes was observed to increase from 39.55 to 77.22 L m −2 h −1 and 77.46 to 236 L m −2 h −1 , respectively at 2 bar. Yang et al 55 also observed that that by utilizing GO during the fabrication of poly(m-phenylene isophthalamide) (PMIA) nanofiltration membrane, higher pure water flux than that of the pristine PMIA membrane was obtained.…”

Section: Hydrophilicity Porosity and Pwf Evaluationmentioning

confidence: 87%

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Fabrication and characterization of graphene oxide–polyethersulfone (GO–PES) composite flat sheet and hollow fiber membranes for oil–water separation

Junaidi

Othman

Shahruddin

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND In this work, a series of graphene oxide–polyethersulfone (GO–PES) composite flat sheet (FS) and hollow fiber (HF) membranes were fabricated by blending 0.5 and 1.0 wt% of GO into the PES matrix and utilized for oil–water separation. GO was first prepared and characterized by using Fourier‐transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X‐ray diffraction (XRD) and thermogravimetric analysis (TGA) before being used as membrane fillers. RESULTS Interestingly, although similar dope composition was used for the fabrication of HF and FS membranes, their morphology and pore size varied significantly owing to the way the membranes were fabricated. Significant enhancement of hydrophilicity was observed for both composite FS and HF membranes, where the water contact angle value decreased from 74.8° to 42.2° and 71.4° to 49.8°, respectively. The flux of the composite membranes increased up to 150% of the bare membranes especially when 1.0 wt% of GO was added. Although higher oil rejection (~99%) was observed for HF membranes that possess smaller pores, the permeation flux was maintained due to the improved flow dynamic. Lower oil rejection (up to 50%) was observed for FS membranes, which might be due to its big pore sizes particularly at the bottom surface. As more oil droplets formed on the membrane surface and prevented water molecules to pass through the membrane, fouling might occur rapidly. CONCLUSIONS The results obtained in this work suggest that surface hydrophilicity, pore size of membranes and oil–water separation performances was greatly affected by membrane shape. Owing to many advantages of HF membranes, this type of membrane has great potential for commercial applications. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 93%

Section: Hydrophilicity Porosity and Pwf Evaluationmentioning

confidence: 87%

Fabrication and characterization of graphene oxide–polyethersulfone (GO–PES) composite flat sheet and hollow fiber membranes for oil–water separation

Junaidi

Othman

Shahruddin

et al. 2020

J of Chemical Tech & Biotech

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show abstract

“…When SCNTs were incorporated into the PA layer, the reaction speed of MPD and TMC was hindered slightly because SCNTs in the MPD solution aggregated and affected MPD's diffusion into the organic phase, and therefore restrained the formation of the ridge and valley structure. 16 To further investigate the reaction mechanism of the membranes' active layer, FTIR was performed. As shown in Fig.…”

Section: Characterization Of Scnts-modied Fo Membranesmentioning

confidence: 99%

“…14 Graphene Oxide (GO) is regarded as an excellent additive and is widely employed as an additive on the surface of FO membranes. 15,16 It was reported that GO-incorporated FO membranes acquired higher water ux, enhanced hydrophilicity and better anti-fouling property. 15 In addition, some other nanomaterials such as metal organic framework (MOF), 17 zeolites, 18 TiO 2 19 and carbon nanotubes (CNTs) 20 have also been incorporated into FO membranes.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of novel forward osmosis membrane incorporated with sulfonated carbon nanotubes

Zhao

Tian

et al. 2018

RSC Adv.

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“…To date, considerable effort has been devoted to improving the hydrophilicity of conventional membranes by employing various techniques, including coating [22,23], blending [9,24,25] and surface grafting polymerization [26]. Among these fabrication methods, blending membranes with inorganic nanoparticles such as Metal-Organic Frameworks (MOFs) [6,27,28], metals [29] or carbide [30,31] has been widely used to fabricate inorganic-organic composite membranes. Among these nanoparticles, silica (SiO 2 ) has been proved to be a promising candidate to blend with membrane during the process of casting solution preparation [24,25], and has also shown benefits such as low cost, a simple synthesis process, high chemical stability and excellent hydrophilicity.…”

Section: Introductionmentioning

confidence: 99%

Polysulfone/Polyamide-SiO2 Composite Membrane with High Permeance for Organic Solvent Nanofiltration

Liu

2018

Membranes

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To improve the filtration performance and properties of organic solvent nanofiltration (OSN) membranes, we firstly introduce nanoporous silica (SiO2) particles into the polyamide (PA) active layer of polysulfone (PSf) membrane via an interfacial polymerization process. Results from the study revealed that introduction of SiO2 influenced the properties of PSf/PA-SiO2 composite membranes by changing the surface roughness and hydrophilicity. Moreover, results also indicated that nanoporous SiO2 modified membranes showed an improved performance of alcohols solvent permeance. The PSf/PA-SiO2 composite membrane modified by 0.025 wt % of SiO2 reached a permeance of 3.29 L m−2 h−1 bar−1 for methanol and 0.42 L m−2 h−1 bar−1 for ethanol, which were 20.0% and 13.5% higher than the control PSf membrane (permeance of 2.74 L m−2 h−1 bar−1 for methanol and 0.37 L m−2 h−1 bar−1 for ethanol). Conclusively, we demonstrated that the increase of membrane hydrophilicity and roughness were major factors contributing to the improved alcohols solvent permeance of the membranes.

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Polyvinylpyrrolidone modified graphene oxide as a modifier for thin film composite forward osmosis membranes

Cited by 90 publications

References 50 publications

Fabrication and characterization of graphene oxide–polyethersulfone (GO–PES) composite flat sheet and hollow fiber membranes for oil–water separation

Fabrication and characterization of graphene oxide–polyethersulfone (GO–PES) composite flat sheet and hollow fiber membranes for oil–water separation

Preparation and characterization of novel forward osmosis membrane incorporated with sulfonated carbon nanotubes

Polysulfone/Polyamide-SiO2 Composite Membrane with High Permeance for Organic Solvent Nanofiltration

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