Hydrophilic polyvinyl alcohol coating on hydrophobic electrospun nanofiber membrane for high performance thin film composite forward osmosis membrane

Park, Myoung Jun; Gonzales, Ralph Rolly; Abdel‐Wahab, Ahmed; Phuntsho, Sherub; Shon, Ho Kyong

doi:10.1016/j.desal.2017.10.042

Cited by 179 publications

(93 citation statements)

References 59 publications

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“…And DH was better at improving water flux, AE was better at improving membrane selectivity, DH–AE improved both water flux and membrane selectivity. The three modified TFC membranes in this study exhibited not only enhanced water flux but also lower reverse salt flux compared to commercial HTI membranes or other modified membranes in Table . The FO performance of these modified membranes was comparable to other membranes reported in the literature, and the method was simple, suitable for industrial production.…”

Section: Resultsmentioning

confidence: 99%

1,3‐Diamino‐2‐propanol or 2‐aminoethanethiol modified active layer of thin‐film composite forward osmosis membrane

Sun

Huang

et al. 2019

J of Applied Polymer Sci

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This work proposes three easy and effective methods to improve the density of the active layer of the thin-film composite (TFC) forward osmosis (FO) membrane. Amino groups are introduced to the polyamide layer to react with the exposed acid chloride groups after a small molecule of 1,3-diamino-2-propanol (DH) or 2-aminoethanethiol (AE) or DH-AE being introduced. This may lead to a higher degree of crosslinking and form a more complex and networked aggregate structure. In this work, three modified membranes are successfully prepared, and a series of characterizations are carried out. The result is that all methods can improve the density of the active layer and increase the salt rejection without adversely affecting the selectivity. The hydrophilicity of the TFC-DH film is significantly improved, the reverse salt flux of the TFC-AE film is remarkably improved, and the effect of the TFC-DH-AE film is between the TFC-DH film and the TFC-AE film. Therefore, the method of adding a small molecular material can increase the degree of polymerization. The method of introducing an inorganic element provides a valuable solution for designing and developing a novel and efficient FO film, which is simple and easy to be operated.

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Section: Resultsmentioning

confidence: 99%

1,3‐Diamino‐2‐propanol or 2‐aminoethanethiol modified active layer of thin‐film composite forward osmosis membrane

Sun

Huang

et al. 2019

J of Applied Polymer Sci

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“…It is noticeable that the membranes all exhibited lower water flux and reverse salt fluxes under FO mode compared to PRO mode of operations and this phenomenon is a result of the dilutive ICP within the membrane support layer, which significantly reduces the osmotic pressure difference during FO mode [25]. Although the PRO mode of operation results in higher water fluxes, it also enhances the reverse solution permeation.…”

Section: Membrane Performancementioning

confidence: 93%

“…The PVDF nanofibers were coated with PAA to obtain a negative surface charge, to make it more susceptible for LbL deposition of electrolytic solutions. The nanofibers were heat-treated at 160°C, a temperature close to but not exceeding the melting point, to enhance the mechanical strength of the fibers [25]. Heat press treatment is expected to allow conjugation of the nanofibers to occur.…”

Section: Properties Of Nanofiber Pvdf Membrane Supportmentioning

confidence: 99%

“…Membrane porosity was determined via gravimetric analysis [25]. Pre-weighed dried samples were soaked in water for 24 h at 30°C, and the wet samples were re-weighed.…”

Section: Pore Size and Porosity Determinationmentioning

confidence: 99%

“…Nanofiber-supported TFC membranes applied for water-based separation processes have been the subject of various studies in the past [20][21][22][23][24][25][26][27]. While nanofiber electrospinning is a practical and noncostly method in membrane fabrication, it is still somehow limited by the electrospinning condition optimization, selection of specific materials suited for particular applications, nanofiber post-treatment [25], nanofiber strength and stability [28], membrane swelling [29], and poor adhesion of the selective polyamide layer from the nanofiber support [20]. These limitations have been addressed in various studies, yet practicality, cost, and robustness of method have yet to be fully optimized.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modification of Nanofiber Support Layer for Thin Film Composite Forward Osmosis Membranes via Layer-By-Layer Polyelectrolyte Deposition

Gonzales

Park

Tijing

et al. 2018

Preprint

Self Cite

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Electrospun nanofiber-supported thin film composite membranes are among the most promising membranes for seawater desalination via forward osmosis. In this study, a high-performance electrospun polyvinylidenefluoride (PVDF) nanofiber-supported TFC membrane was successfully fabricated after molecular layer-by-layer polyelectrolyte deposition. Negatively-charged electrospun polyacrylic acid (PAA) nanofibers were deposited on electrospun PVDF nanofibers to form a support layer consisted of PVDF and PAA nanofibers. This resulted to a more hydrophilic support compared to the plain PVDF nanofiber support. The PVDF-PAA nanofiber support then underwent a layer-by-layer deposition of polyethylenimine (PEI) and PAA to form a polyelectrolyte layer on the nanofiber surface prior to interfacial polymerization, which forms the selective polyamide layer of TFC membranes. The resultant PVDF-LbL TFC membrane exhibited enhanced hydrophilicity and porosity, without sacrificing mechanical strength. As a result, it showed high pure water permeability and low structural parameter values of 4.12 Lm and 221 µm, respectively, significantly better compared to commercial FO membrane. Layer-by-layer deposition of polyelectrolyte is therefore a useful and practical modification method for fabrication of high performance nanofiber-supported TFC membrane.

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Viruses and Non‐Woven Polymers: Surface Properties and Future Perspectives in Sampling for Wastewater‐Based Epidemiology

Ahmedullah,

Whiley,

Fallowfield

et al. 2024

Adv Materials Inter

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Environmental disease monitoring initiatives such as wastewater‐based epidemiology can offer a unique perspective on the health status of a population. Such efforts are being increasingly utilized to guide public health initiatives and to aid in controlling the spread of infectious diseases. Key to these approaches is the sampling and identification of viruses, bacteria, and other pathogens. Advanced material technologies can be explored for the development of materials suitable for sampling, leading to the retention and detection of viruses. Here, how the surface interactions between viruses and adsorbent materials can inform the future development of effective, novel materials to aid in sampling viruses for wastewater‐based epidemiology are considered. This review provides a summary of the surface properties of viruses along with their physiochemical interactions with adsorbent materials at the solid‐water interface. Also discussed are the properties of non‐woven polymer membranes, a newer material technology being employed for the retention of viruses, with a focus on virus‐capture applications in aqueous environments.

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Hydrophilic polyvinyl alcohol coating on hydrophobic electrospun nanofiber membrane for high performance thin film composite forward osmosis membrane

Cited by 179 publications

References 59 publications

1,3‐Diamino‐2‐propanol or 2‐aminoethanethiol modified active layer of thin‐film composite forward osmosis membrane

1,3‐Diamino‐2‐propanol or 2‐aminoethanethiol modified active layer of thin‐film composite forward osmosis membrane

Modification of Nanofiber Support Layer for Thin Film Composite Forward Osmosis Membranes via Layer-By-Layer Polyelectrolyte Deposition

Viruses and Non‐Woven Polymers: Surface Properties and Future Perspectives in Sampling for Wastewater‐Based Epidemiology

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