A novel TFC forward osmosis (FO) membrane supported by polyimide (PI) microporous nanofiber membrane

Chi, Xiang-Yu; Zhang, Ping-Yun; Guo, Xuhong; Xu, Zheng

doi:10.1016/j.apsusc.2017.07.259

Cited by 51 publications

(16 citation statements)

References 27 publications

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“…Typically, O/N ratio is considered to be an insight into the cross-linking degree of PA layers. 52,53 However, in this work, because of the signicant changes in the O1s and N1s contents, O/N ratio was not accurate enough to estimate the PA layer cross-linking degree. Therefore, the chemical bonding and their contents were resolved from C1s, N1s and Cl2p (Fig.…”

Section: Effects Of Da Self-polymerization On Membrane Chemical Propementioning

confidence: 84%

Dopamine incorporating forward osmosis membranes with enhanced selectivity and antifouling properties

Wang

Fang²,

Zhao

et al. 2018

RSC Adv.

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Section: Effects Of Da Self-polymerization On Membrane Chemical Propementioning

confidence: 84%

Dopamine incorporating forward osmosis membranes with enhanced selectivity and antifouling properties

Wang

Fang²,

Zhao

et al. 2018

RSC Adv.

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“…In order to measure S, the support first must be coated with a selective layer, which is usually done by applying the IP technique. However, depositing a coating using IP is laborious and not easily reproducible (Section 2.2.1), which perhaps surprisingly affects the value of the calculated S. Chi et al [195] obtained different S values for the same support when they changed the ethanol concentration in the aqueous MPD phase for IP-coating. Increasing the ethanol concentration from 25 wt.% to 100 wt.% led to a decrease in the S value from 463 µm to 350 µm [195].…”

Section: Structural Parameter (S)mentioning

confidence: 99%

“…However, depositing a coating using IP is laborious and not easily reproducible (Section 2.2.1), which perhaps surprisingly affects the value of the calculated S. Chi et al [195] obtained different S values for the same support when they changed the ethanol concentration in the aqueous MPD phase for IP-coating. Increasing the ethanol concentration from 25 wt.% to 100 wt.% led to a decrease in the S value from 463 µm to 350 µm [195]. This study highlights an unanticipated sensitivity of the outcome of Equation (1) with respect to the selective layer, even though this in principle should only be affected by the support.…”

Section: Structural Parameter (S)mentioning

confidence: 99%

“…Secondly, several other parameters besides tortuosity, porosity, and thickness are known to influence ICP, i.e. the support pore diameter [114,197], pore morphology [136,[198][199][200], hydrophilicity [187,195,201], and charge [202].…”

Section: Structural Parameter (S)mentioning

confidence: 99%

“…However, it generates inaccurate and/or irreproducible S values when it is used to compare different membranes and even when the same membrane is examined under different experiment conditions [23,186,194,206]. Put differently, Equation (1) does not yield a good indicator for assessing ICP [23,24,195]. For better estimations of ICP (hence of membrane performance), it is essential to develop a reliable, standardized method for determining S that incorporates all parameters that influence S.…”

Section: Draw (M Nacl)mentioning

confidence: 99%

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Forward Osmosis: A Critical Review

et al. 2020

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The use of forward osmosis (FO) for water purification purposes has gained extensive attention in recent years. In this review, we first discuss the advantages, challenges and various applications of FO, as well as the challenges in selecting the proper draw solution for FO, after which we focus on transport limitations in FO processes. Despite recent advances in membrane development for FO, there is still room for improvement of its selective layer and support. For many applications spiral wound membrane will not suffice. Furthermore, a defect-free selective layer is a prerequisite for FO membranes to ensure low solute passage, while a support with low internal concentration polarization is necessary for a high water flux. Due to challenges affiliated to interfacial polymerization (IP) on non-planar geometries, we discuss alternative approaches to IP to form the selective layer. We also explain that, when provided with a defect-free selective layer with good rejection, the membrane support has a dominant influence on the performance of an FO membrane, which can be estimated by the structural parameter (S). We emphasize the necessity of finding a new method to determine S, but also that predominantly the thickness of the support is the major parameter that needs to be optimized.

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Preparation of highly selective nanofiltration composite membranes based on a novel soluble rigidly contorted monomer

Zhou,

Liu,

Jiang

et al. 2024

J of Applied Polymer Sci

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Nanofiltration composite membranes with high selectivity are one of the most critical cores in water treatment, and regulating the surface charge and pore structure of active separation layers in thin film composite membranes is one of the most effective means to improve the selectivity of composite membranes. This article synthesized a novel monomer with positive charge and a rigid twisted Tröger's base structure (named TBDA‐SO3), which was manipulated to improve the microporous structure and surface charge of the composite membrane. By interfacial polymerization, TBDA‐SO3, and piperazine were co‐reacted with trimesoyl chloride to successfully prepare positively charged, highly selective, and strongly microporous polyamide composite nanofiltration membranes. The best‐performing composite nanofiltration membrane in this article has a permeability similar to that of the control group's poly(piperazine amide) (PPA) membrane (pure water flux, 7.8 L m−2 h−1 bar−1), but has excellent divalent cation selectivity (52.57), which is 4.4 times that of the control group's PPA membrane.

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A novel TFC forward osmosis (FO) membrane supported by polyimide (PI) microporous nanofiber membrane

Cited by 51 publications

References 27 publications

Dopamine incorporating forward osmosis membranes with enhanced selectivity and antifouling properties

Dopamine incorporating forward osmosis membranes with enhanced selectivity and antifouling properties

Forward Osmosis: A Critical Review

Preparation of highly selective nanofiltration composite membranes based on a novel soluble rigidly contorted monomer

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