Anti-oil-fouling hydrophobic-superoleophobic composite membranes for robust membrane distillation performance

Tang, Min; Hou, Deyin; Ding, Chunli; Wang, Kunpeng; Wang, Dewu; Wang, Jun

doi:10.1016/j.scitotenv.2019.133883

Cited by 52 publications

(34 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The images and values of measured UOCA are given in Figure 6. The most important reason for surface oleophobicity can be attributed to the hydrophilic functional groups at the surface 57 . Hence, the maximum UOCA (152°) was observed in the PAN/PANI (coated) membrane that could be due to the presence of most hydrophilic amino groups on the surface of the PAN nanofibers.…”

Section: Resultsmentioning

confidence: 99%

Development of a superhydrophilic nanofiber membrane for oil/water emulsion separation via modification of polyacrylonitrile/polyaniline composite

Shakiba

Nabavi

Emadi

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

In this research, polyaniline (PANI) was used to modify polyacrylonitrile (PAN) electrospun nanofibers for separating oil/water (O/W) emulsions due to its hydrophilic amino groups and simple synthesis. The fabrication of PAN/PANI membranes was carried out by two different methods: blending of PANI with PAN in pre‐electrospinning solution and coating of PANI on the PAN electrospun nanofibers using in situ polymerization of aniline. The effect of PANI composition (10, 20, 30 and 40 wt% with respect to the weight of PAN) and electrospinning temperature (25°C, 40°C and 55°C) was investigated in PAN/PANI membrane fabrication. The prepared membranes were characterized by Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), water and under water oil contact angle (WCA and UOCA) measurement and mechanical tensile test. Regarding the results, PAN/40%PANI nanofibers prepared at 40°C was considered as the superhydrophilic nanofibers (WCA < 5°) and the most suitable membrane among the samples for separation of O/W emulsions. Separation studies revealed a flux of 1300 Lmh (pure water) under gravity and an efficient oil rejection of about 98.8% for PAN/40%PANI@40°C membrane. Hence, the PAN/40%PANI@40°C membrane was subjected to additional tests including separation of different industrial oils, emulsion separation with surfactant agent, separation under harsh acidic/basic conditions and fouling test. The results confirmed an efficient performance of the obtained superhydrophilic membrane for O/W separation, which make it a potential candidate for the purification of water from industrial organic pollutant.

show abstract

Section: Resultsmentioning

confidence: 99%

Development of a superhydrophilic nanofiber membrane for oil/water emulsion separation via modification of polyacrylonitrile/polyaniline composite

Shakiba

Nabavi

Emadi

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…In the MD process, the electrospun nanofiber membranes reveal a higher flux than conventional polymers due to their higher porosity and interconnected open structure. [ 30–32 ] The water contact angle of electrospun membranes is usually higher than in other manufacturing methods because of the increased surface roughness created. It reduces the membrane surface energy and improves the hydrophobicity and wetting resistance.…”

Section: Electrospinningmentioning

confidence: 99%

“…The highest oil contact angle obtained through the electrospinning modifications (161.7°) was achieved by combining polyacrylonitrile (PAN) on a PTFE surface with NaOH hydrolyzation. [ 32 ] Notably, the membrane oleophobicity seems more enhanced when a cross‐link reaction is used after electrospinning modification than the one‐step electrospinning using hydrophilic agents.…”

Section: Electrospinningmentioning

confidence: 99%

“…Examples of cross‐link agents used as a second step of electrospinning were focused on GA, [ 42 ] ethylenediamine (EDA), [ 32,43 ] and sodium hydroxide (NaOH). [ 32 ] The membrane hydrolyzation was done by forming hydrophilic groups such as aldehydes, amines, or carboxyls on the membrane surface. The cross‐link between the electrospun hydrophilic layers did not introduce wetting defects on the hydrophobic substrates and improved the repulsive hydration force to oil droplets.…”

Section: Electrospinningmentioning

confidence: 99%

See 1 more Smart Citation

Membrane Surface Modification by Electrospinning, Coating, and Plasma for Membrane Distillation Applications: A State‐of‐the‐Art Review

et al. 2021

View full text Add to dashboard Cite

Membrane distillation (MD) is a thermally driven separation process where a hydrophobic and microporous membrane separates nonvolatile compounds. Because of its advantages, this process appears as an efficient way to recover water from industrial effluents. However, the commercial membranes used in the MD process still have operational troubles with complex industrial wastewater and against harsh operational conditions. Fouling, wetting, and low time of operation compromise the membrane function and make the total consolidation of MD technology difficult beyond the traditional application (desalination). Membrane modification can be key to mitigating these operational problems, allowing MD's expansion to complex separations. In this context, herein the main technologies to modify the membranes for MD applications of the last five years are comprehensively summarized. Three kinds of postfabrication modifications are focused on: electrospinning, coating, and plasma, including polymeric and ceramic membranes. A critical analysis of each technique is developed, discussing their potentialities and the properties achieved through them. This review enables the understanding of the operational problems of MD technology and leads to finding feasible alternatives to their mitigation. It also clarifies the evolution in membrane modification, discusses the development directions, and points out the future challenges of modifications.

show abstract

“…15 Inspired by the feature of lotus leaves or sharkskin, superhydrophobic membranes were first tailored by constructing a hierarchical rough structure combined with a hydrophobic surface. [16][17][18] Hydrophobic surfaces with a hierarchical rough structure can provide air pockets that decrease the total contact area between the membrane and water. 19 Grafting or depositing low surface energy materials, such as fluoroalkyl-chains, onto a membrane surface is another common method to increase hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

Emerging investigator series: engineering membrane distillation with nanofabrication: design, performance and mechanisms

Huang

Liu

Woo

et al. 2020

Environ. Sci.: Water Res. Technol.

View full text Add to dashboard Cite

show abstract

Anti-oil-fouling hydrophobic-superoleophobic composite membranes for robust membrane distillation performance

Cited by 52 publications

References 58 publications

Development of a superhydrophilic nanofiber membrane for oil/water emulsion separation via modification of polyacrylonitrile/polyaniline composite

Development of a superhydrophilic nanofiber membrane for oil/water emulsion separation via modification of polyacrylonitrile/polyaniline composite

Membrane Surface Modification by Electrospinning, Coating, and Plasma for Membrane Distillation Applications: A State‐of‐the‐Art Review

Emerging investigator series: engineering membrane distillation with nanofabrication: design, performance and mechanisms

Contact Info

Product

Resources

About