Controlling the morphology and performance of FO membrane via adjusting the atmosphere humidity during casting procedure

Zuo, Hao-Ran; Cao, Gaoping; Wang, Meng; Zhang, Huan‐Huan; Song, Changjiang; Xu, Fang; Wang, Tao

doi:10.1016/j.apsusc.2017.08.158

Cited by 8 publications

(4 citation statements)

References 62 publications

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“…In the RO process, the water flux and salt rejection are dominated by the active layers, while the substrates merely provide the mechanical support. 35 The concentration polarization of both internal and external can be ignored when the feed concentration is not very high. 36 However, when it comes to the FO process, J v and J s are affected by both the active layer and the substrate due to the fact that driving force is the osmotic pressure difference across the membranes.…”

Section: Resultsmentioning

confidence: 99%

“…The reason might be that the substrate plays a more important role in the FO process than that in the RO process. In the RO process, the water flux and salt rejection are dominated by the active layers, while the substrates merely provide the mechanical support . The concentration polarization of both internal and external can be ignored when the feed concentration is not very high .…”

Section: Resultsmentioning

confidence: 99%

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Impact of Cross-Linked Chitosan Sublayer Structure on the Performance of TFC FO PAN Nanofiber Membranes

Chi

Xia

et al. 2018

ACS Omega

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Polyacrylonitrile (PAN) is a popular material in membrane field because of its excellent mechanical property, thermal stability, and chemical resistance. Unfortunately, PAN nanofibers produced by electrospinning are not suitable for interfacial polymerization process directly due to its hydrophobicity and large average pore size. In this work, the cross-linked chitosan (CS) solution was coated on the nanofiber surface to fabricate a sublayer, based on which thin-film composite (TFC) membranes were prepared using m -phenylenediamine and 1,3,5-trimesoyl chloride as the monomers. The impact of the different sublayers on the performances of TFC PAN nanofiber membranes for forward osmosis (FO) was studied by varying cross-linked CS concentrations. The results indicated that the increased CS concentration not only led to the relatively denser polyamide layer, but also changed its morphology. In the reverse osmosis process, NaCl rejection increased from 46.5 to 83.5%. Salt flux from feed solution to draw solution decreased from 25.8 to 8.9 g·m –2 ·h –1 (0.1 M NaCl solution as feed, 2 M glucose solution as draw solution, FO mode). This study found that the sublayer had noteworthy impact on the separation layer and helped us to pave the way to design high-performance FO membranes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Impact of Cross-Linked Chitosan Sublayer Structure on the Performance of TFC FO PAN Nanofiber Membranes

Chi

Xia

et al. 2018

ACS Omega

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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: 86%

Dopamine incorporating forward osmosis membranes with enhanced selectivity and antifouling properties

Wang

Fang²,

Zhao

et al. 2018

RSC Adv.

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“…No appreciable voids or pores were observed at the membrane surface, indicating the formation of a highly dense skin layer. A typical asymmetric morphology, which is the result of non-solvent induced phase inversion, was observed in the crosssectional image [33]. While the sponge-like structure with domains in the micrometer-range is shown in the dense skin layer, irregular finger-like macrovoids are formed in the sublayer.…”

Section: Ftir and Xpsmentioning

confidence: 88%

Polybenzimidazole Membrane Crosslinked with Epoxy-Containing Inorganic Networks for Organic Solvent Nanofiltration and Aqueous Nanofiltration under Extreme Basic Conditions

2022

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In this study, a novel polybenzimidazole (PBI)-based organic solvent nanofiltration (OSN) membrane possessing excellent stability under high pH condition was developed. To improve the chemical stability, the pristine PBI membrane was crosslinked with a silane precursor containing an epoxy end group. In detail, hydrolysis and condensation reaction of methoxysilane in the 3-glycidyloxypropyl trimethoxysilane (GPTMS) yields organic–inorganic networks within the PBI membrane structure. At the same time, the epoxy end groups on the organosiloxane network (Si–O–Si) reacted with amine groups of PBI to complete the crosslinking. The resulting crosslinked PBI membrane exhibited a good stability upon exposure to organic solvents and was not decomposed even in basic solution (pH 13). Our membrane showed an ethanol permeance of 27.74 LMHbar−1 together with a high eosin Y rejection of >90% under 10 bar operation pressure at room temperature. Furthermore, our PBI membrane was found to be operational even under an extremely basic condition, although the effective pore size was slightly enlarged due to the pore swelling effect. The results suggest that our membrane is a promising candidate for OSN application under basic conditions.

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Controlling the morphology and performance of FO membrane via adjusting the atmosphere humidity during casting procedure

Cited by 8 publications

References 62 publications

Impact of Cross-Linked Chitosan Sublayer Structure on the Performance of TFC FO PAN Nanofiber Membranes

Impact of Cross-Linked Chitosan Sublayer Structure on the Performance of TFC FO PAN Nanofiber Membranes

Dopamine incorporating forward osmosis membranes with enhanced selectivity and antifouling properties

Polybenzimidazole Membrane Crosslinked with Epoxy-Containing Inorganic Networks for Organic Solvent Nanofiltration and Aqueous Nanofiltration under Extreme Basic Conditions

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