Free-standing, thin-film, symmetric membranes: Next-generation membranes for engineered osmosis

Phuntsho, Sherub; Kim, Jung Eun; Tran, Van Huy; Tahara, S.; Uehara, Naoki; Maruko, Nobuhiro; Matsuno, Hirozumi; Lim, Sang-Hyun; Shon, Ho Kyong

doi:10.1016/j.memsci.2020.118145

Cited by 17 publications

(4 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ICP will seriously impede the transport of water molecules across membranes . In recent years, symmetric FO (SFO) membranes without supporting layers have received increasing attention, which can eliminate ICP and provide ideal water flux − (Figure ). In asymmetric FO membranes, the decrease of ICP is accompanied by an increase in RSF, but with the improvement of selectivity of SFO membranes and the selection of suitable draw solutions, RSF can still be well-controlled.…”

Section: Inhibition Of Rsf In Osmfcsmentioning

confidence: 99%

Inhibition Strategies of Reverse Solute Flux in Osmotic Microbial Fuel Cells: Take Forward Osmosis as Reference

Duan

Zhang

et al. 2023

ACS EST Water

View full text Add to dashboard Cite

The osmotic microbial fuel cell (OsMFC) is formed by combining forward osmosis (FO) and microbial fuel cells (MFC). Its excellent performance undoubtedly provided a new research direction for the application of FO and MFCs. However, the reverse solute flux (RSF) in FO also follows. RSF will cause a series of negative effects such as loss of draw solutions, decrease of water flux, and electricity generation. Therefore, inhibition of RSF is very necessary for the practical application of OsMFCs. Currently, there are much research and related reviews on RSF inhibition in FO but few studies on OsMFCs. To provide some new ideas for the inhibition of RSF in OsMFCs, we focused on three aspects: operating conditions, draw solutions, and FO membranes. Existing studies have demonstrated that some strategies are effective in OsMFC, including inhibitory effect of current generation, conventional inorganic draw solutions, membrane materials and orientation, and modified membranes. But there are many more strategies available. Using FO as a reference, strategies such as pressure-assisted osmosis and temperature control may be feasible and need to be investigated further. In the future, the inhibition or utilization of RSF can further improve the reactor performance and promote the early practical application of OsMFCs.

show abstract

Section: Inhibition Of Rsf In Osmfcsmentioning

confidence: 99%

Inhibition Strategies of Reverse Solute Flux in Osmotic Microbial Fuel Cells: Take Forward Osmosis as Reference

Duan

Zhang

et al. 2023

ACS EST Water

View full text Add to dashboard Cite

show abstract

“…This strategy of membrane preparation can be useful for designing of next generation RO membranes, by studying the inherent structural and transport properties of thin film membranes in absence of any supporting layer. Besides, self‐standing membranes are expected to offer low resistance to diffusional solvent transport, as well as minimum internal concentration polarization effect, that shall be more beneficial for forward osmosis applications 152 . Table 5 lists some novel PVA‐based thin film composite RO membranes.…”

Section: Pva‐based Membranes For Water Treatmentmentioning

confidence: 99%

Poly(vinyl alcohol)‐based membranes for fuel cell and water treatment applications: A review on recent advancements

Choudhury

Gohil

Dutta

2021

Polymers for Advanced Techs

View full text Add to dashboard Cite

Clean water and energy are two of the most important requirements for human survival. Membrane‐based filtration represents one of the advanced technologies involved in water decontamination; while, polymer electrolyte membrane fuel cells (PEMFCs) are among the frontrunners in the alternative and renewable energy domain. It is evident that membrane‐based processes provide sustainable solution to the ever‐increasing demand of energy and clean water. Over the years, it has been realized that synthetic poly(vinyl alcohol) (PVA) is one of the potential candidates for the development of membranes, owing to its hydrophilicity, barrier property, film forming ability, crosslinking ability, biodegradability, and low cost. These properties have been widely explored for the fabrication of polymer electrolyte membranes for PEMFCs, in order to improve the ionic conductivity and methanol barrier property, as well as, to reduce the membrane fabrication cost. On the other hand, high water solubility and film forming characteristics of PVA have been used for the formation of water treatment membranes, for enhancing the antifouling property and chemical stability. This review provides in‐depth discussions and analyses on the structure and properties of various PVA‐based copolymers, and their applications as membrane materials for PEMFCs (including direct methanol and alkaline fuel cells) and water remediation.

show abstract

“…Over the last few years, developing forward osmosis (FO) technology has gained widespread attention owing to its spontaneous separation ability driven by osmotic pressure and its inherently low fouling tendency. − Currently, widely used commercial asymmetric FO membranes such as cellulose triacetate and polyamide thin film composite membranes have served as the benchmark for creating innovative FO membranes. − Nevertheless, because the porous support substrates of these membranes act as a barrier for draw solution (DS) diffusion, the driving force for water permeation is drastically diminished during FO operations. This phenomenon, known as internal concentration polarization (ICP), remarkably disturbs the performance of asymmetric FO membranes and has become the main challenge in FO technology development. − …”

Section: Introductionmentioning

confidence: 99%

High-Performance, Free-Standing Symmetric Hybrid Membranes for Osmotic Separation

Geng

Liang

Sun

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The internal concentration polarization (ICP) of asymmetric osmotic membranes with support layers greatly reduced membrane water permeability, therefore compromising membrane performance. In this study, a series of free-standing symmetric hybrid forward osmosis (FO) membranes without experiencing ICP were fabricated by covalently linking metal−organic framework (MOF) nanofillers with a polymer matrix. Owing to the introduction of MOFs, which allow only water permeation but reject salts by steric hindrance, the prepared hybrid membranes could approach the empirical permeability-selectivity trade-off. The optimized hybrid membrane displayed an outstanding water/Na 2 SO 4 selectivity of ∼1208.4 L mol −1 , compared with that of conventional membranes of ∼375.6 L mol −1 . Additionally, the fabricated hybrid membranes showed excellent mechanical robustness, maintaining structural integrity during the long-term FO separation of high-salinity solution. This work provides an effective methodology to fabricate high-performance, symmetric MOF-based membranes for osmotic separation processes such as seawater desalination and water purification.

show abstract

Free-standing, thin-film, symmetric membranes: Next-generation membranes for engineered osmosis

Cited by 17 publications

References 41 publications

Inhibition Strategies of Reverse Solute Flux in Osmotic Microbial Fuel Cells: Take Forward Osmosis as Reference

Inhibition Strategies of Reverse Solute Flux in Osmotic Microbial Fuel Cells: Take Forward Osmosis as Reference

Poly(vinyl alcohol)‐based membranes for fuel cell and water treatment applications: A review on recent advancements

High-Performance, Free-Standing Symmetric Hybrid Membranes for Osmotic Separation

Contact Info

Product

Resources

About