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A new nano-engineered hierarchical membrane for concurrent removal of surfactant and oil from oil-in-water nanoemulsion.

Qin D, Liu Z, Bai H, Sun DD, Song X - Sci Rep (2016)

Bottom Line: The physical and chemical properties of the overall membrane, including wettability, surface roughness, electric charge, thickness and structures, are delicately tailored through a nano-engineered fabrication process, that is, graphene oxide (GO) nanosheet assisted phase inversion coupled with surface functionalization.Compared with the membrane fabricated by conventional phase inversion, this novel membrane has four times higher water flux, significantly higher rejections of both oil (~99.9%) and surfactant (as high as 93.5%), and two thirds lower fouling ratio when treating surfactant stabilized oil-in-water nanoemulsion.Due to its excellent performances and facile fabrication process, this nano-engineered membrane is expected to have wide practical applications in the oil/water separation fields of environmental protection and water purification.

View Article: PubMed Central - PubMed

Affiliation: Energy Research Institute @ NTU, Interdisciplinary Graduate School, Nanyang Technological University, 639798, Singapore.

ABSTRACT
Surfactant stabilized oil-in-water nanoemulsions pose a severe threat to both the environment and human health. Recent development of membrane filtration technology has enabled efficient oil removal from oil/water nanoemulsion, however, the concurrent removal of surfactant and oil remains unsolved because the existing filtration membranes still suffer from low surfactant removal rate and serious surfactant-induced fouling issue. In this study, to realize the concurrent removal of surfactant and oil from nanoemulsion, a novel hierarchically-structured membrane is designed with a nanostructured selective layer on top of a microstructured support layer. The physical and chemical properties of the overall membrane, including wettability, surface roughness, electric charge, thickness and structures, are delicately tailored through a nano-engineered fabrication process, that is, graphene oxide (GO) nanosheet assisted phase inversion coupled with surface functionalization. Compared with the membrane fabricated by conventional phase inversion, this novel membrane has four times higher water flux, significantly higher rejections of both oil (~99.9%) and surfactant (as high as 93.5%), and two thirds lower fouling ratio when treating surfactant stabilized oil-in-water nanoemulsion. Due to its excellent performances and facile fabrication process, this nano-engineered membrane is expected to have wide practical applications in the oil/water separation fields of environmental protection and water purification.

No MeSH data available.


Related in: MedlinePlus

Membrane separation of oil-in-water nanoemulsion.(a-1) Fouling ratios, (a-2) oil rejections, and (a-3) concurrent rejections of surfactant under different oil concentrations, respectively (surfactant/oil ratio is kept as 0.15 and transmembrane pressure is 1 bar). (b-1) Fouling ratios, (b-2) oil rejections, and (b-3) concurrent rejections of surfactant under different surfactant/oil ratios, respectively (oil concentration is kept as 1200 mg/L and transmembrane pressure is 1 bar). (c-1) Fouling ratios, (c-2) oil rejections, (c-3) concurrent rejections of surfactant under different transmembrane pressures, respectively (oil concentration is 1200 mg/L and surfactant/oil ratio is 0.15).
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f6: Membrane separation of oil-in-water nanoemulsion.(a-1) Fouling ratios, (a-2) oil rejections, and (a-3) concurrent rejections of surfactant under different oil concentrations, respectively (surfactant/oil ratio is kept as 0.15 and transmembrane pressure is 1 bar). (b-1) Fouling ratios, (b-2) oil rejections, and (b-3) concurrent rejections of surfactant under different surfactant/oil ratios, respectively (oil concentration is kept as 1200 mg/L and transmembrane pressure is 1 bar). (c-1) Fouling ratios, (c-2) oil rejections, (c-3) concurrent rejections of surfactant under different transmembrane pressures, respectively (oil concentration is 1200 mg/L and surfactant/oil ratio is 0.15).

Mentions: Fouling ratio (see the definition in Methods section), oil rejection, and concurrent surfactant rejection were systematically investigated for P, GO-P and GO-P-S membranes when separating oil-in-water nanoemulsion. Figure 6a-1 shows that membrane fouling is aggravated as oil concentration increased. More importantly, GO-P-S membrane demonstrates much better antifouling capability compared with the other two membranes. For example, the fouling ratio of P membrane is increased from 51.5% to 77.3% along with the increase of oil concentration from 400 mg/L to 2000 mg/L, while the fouling ratio of GO-P-S membrane is only increased from 7.0% to 26.7% correspondingly. This means the JW,nanoemulsion of GO-P-S membrane (119 L m−2 h−1) is five times as high as that of P membrane (23.2 L m−2 h−1) at 2000 mg/L oil concentration.


A new nano-engineered hierarchical membrane for concurrent removal of surfactant and oil from oil-in-water nanoemulsion.

Qin D, Liu Z, Bai H, Sun DD, Song X - Sci Rep (2016)

Membrane separation of oil-in-water nanoemulsion.(a-1) Fouling ratios, (a-2) oil rejections, and (a-3) concurrent rejections of surfactant under different oil concentrations, respectively (surfactant/oil ratio is kept as 0.15 and transmembrane pressure is 1 bar). (b-1) Fouling ratios, (b-2) oil rejections, and (b-3) concurrent rejections of surfactant under different surfactant/oil ratios, respectively (oil concentration is kept as 1200 mg/L and transmembrane pressure is 1 bar). (c-1) Fouling ratios, (c-2) oil rejections, (c-3) concurrent rejections of surfactant under different transmembrane pressures, respectively (oil concentration is 1200 mg/L and surfactant/oil ratio is 0.15).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4834549&req=5

f6: Membrane separation of oil-in-water nanoemulsion.(a-1) Fouling ratios, (a-2) oil rejections, and (a-3) concurrent rejections of surfactant under different oil concentrations, respectively (surfactant/oil ratio is kept as 0.15 and transmembrane pressure is 1 bar). (b-1) Fouling ratios, (b-2) oil rejections, and (b-3) concurrent rejections of surfactant under different surfactant/oil ratios, respectively (oil concentration is kept as 1200 mg/L and transmembrane pressure is 1 bar). (c-1) Fouling ratios, (c-2) oil rejections, (c-3) concurrent rejections of surfactant under different transmembrane pressures, respectively (oil concentration is 1200 mg/L and surfactant/oil ratio is 0.15).
Mentions: Fouling ratio (see the definition in Methods section), oil rejection, and concurrent surfactant rejection were systematically investigated for P, GO-P and GO-P-S membranes when separating oil-in-water nanoemulsion. Figure 6a-1 shows that membrane fouling is aggravated as oil concentration increased. More importantly, GO-P-S membrane demonstrates much better antifouling capability compared with the other two membranes. For example, the fouling ratio of P membrane is increased from 51.5% to 77.3% along with the increase of oil concentration from 400 mg/L to 2000 mg/L, while the fouling ratio of GO-P-S membrane is only increased from 7.0% to 26.7% correspondingly. This means the JW,nanoemulsion of GO-P-S membrane (119 L m−2 h−1) is five times as high as that of P membrane (23.2 L m−2 h−1) at 2000 mg/L oil concentration.

Bottom Line: The physical and chemical properties of the overall membrane, including wettability, surface roughness, electric charge, thickness and structures, are delicately tailored through a nano-engineered fabrication process, that is, graphene oxide (GO) nanosheet assisted phase inversion coupled with surface functionalization.Compared with the membrane fabricated by conventional phase inversion, this novel membrane has four times higher water flux, significantly higher rejections of both oil (~99.9%) and surfactant (as high as 93.5%), and two thirds lower fouling ratio when treating surfactant stabilized oil-in-water nanoemulsion.Due to its excellent performances and facile fabrication process, this nano-engineered membrane is expected to have wide practical applications in the oil/water separation fields of environmental protection and water purification.

View Article: PubMed Central - PubMed

Affiliation: Energy Research Institute @ NTU, Interdisciplinary Graduate School, Nanyang Technological University, 639798, Singapore.

ABSTRACT
Surfactant stabilized oil-in-water nanoemulsions pose a severe threat to both the environment and human health. Recent development of membrane filtration technology has enabled efficient oil removal from oil/water nanoemulsion, however, the concurrent removal of surfactant and oil remains unsolved because the existing filtration membranes still suffer from low surfactant removal rate and serious surfactant-induced fouling issue. In this study, to realize the concurrent removal of surfactant and oil from nanoemulsion, a novel hierarchically-structured membrane is designed with a nanostructured selective layer on top of a microstructured support layer. The physical and chemical properties of the overall membrane, including wettability, surface roughness, electric charge, thickness and structures, are delicately tailored through a nano-engineered fabrication process, that is, graphene oxide (GO) nanosheet assisted phase inversion coupled with surface functionalization. Compared with the membrane fabricated by conventional phase inversion, this novel membrane has four times higher water flux, significantly higher rejections of both oil (~99.9%) and surfactant (as high as 93.5%), and two thirds lower fouling ratio when treating surfactant stabilized oil-in-water nanoemulsion. Due to its excellent performances and facile fabrication process, this nano-engineered membrane is expected to have wide practical applications in the oil/water separation fields of environmental protection and water purification.

No MeSH data available.


Related in: MedlinePlus