High-performance polyamide thin-film composite nanofiltration membrane: Role of thermal treatment

Liu, Baicang; Wang, Shuai; Zhao, Pingju; Liang, Heng; Zhang, Wen; Crittenden, John C.

doi:10.1016/j.apsusc.2017.11.126

Cited by 32 publications

(14 citation statements)

References 46 publications

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“…Other research works also reported that heat treatment could induce the further cross-linking reaction between the residual unreacted amine and acyl chloride groups. 24,25 Thus, when the TMC solution was poured on the m -phenylenediamine (MPD)-impregnated support, the −COCl groups of TMC not only reacted with the −NH 2 groups of MPD, but also with those of CS. 26 As a result, the newly formed byproduct of the IP, −CONH, had generated good adhesion between the polyamide layer and cross-linked CS layer.…”

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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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%

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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“…According to the dynamics of the interfacial polymerization, it reaches the equilibrium state of PIP diffusion‐suppression in a few seconds after the contact of the two‐phase monomer. And the degree of reaction can be promoted by increasing the reacting temperature . During the reaction, we divided the process of interfacial polymerization of PIP and TMC into two stages, that is, initial polymerization before heat treatment and further polymerization during oven heat treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Besides, reaction time, relative humidity, and coating temperature are verified to be important parameters for optimizing the piperazine (PIP) NF skin layer by interfacial polymerization . Additionally, many studies have reported that heat treatment can significantly influence the membrane water permeability and ion rejection . However, in the production process, coating amount of the organic phase also plays a very important role in optimizing the performance of NF membranes, but there are few reports on this.…”

Section: Introductionmentioning

confidence: 99%

Manipulating the separation performance of nanofiltration membranes by coating thickness of organic phase during interfacial polymerization

Cheng¹,

Pan²,

Liu³

et al. 2019

J of Applied Polymer Sci

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Nanofiltration (NF) membranes have excellent separation capabilities and selective performance, and are widely applied in the field of concentration and separation of salt and inorganic salt mixtures. In this article, NF membranes with a higher comprehensive performance were fabricated using a thinner coated organic phase during interfacial polymerization, which greatly reduced the rejection of sodium chloride and significantly improved the water flux without reducing the rejection of magnesium sulfate. Structure comparison found that thinner polyamide separation layer resulted in the higher crosslinking degree, smaller particle, and relatively rough surface. Based on these analyses, we hypothesized that thermodynamically efficiency in the system varies with the coating thickness. Finally, the mechanism of the influence of the coating thickness of organic phase during heat treatment on the interfacial polymerization process and membrane structure was discussed.

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“…Thereinto, thermal treatment is the most commonly used method to control the structure of the PA layer. Theoretically, the residual solvent in the PA layer volatilizes faster and the unreacted monomers further cross-link at higher temperature, resulting in a smaller pore size and less carboxyl groups hydrolyzed from residual acyl chloride groups. , Zhan et al reported that a PA layer with nodular surface structure formed during thermal treatment because of the further monomer reaction (Figure ), while the water permeability of the obtained NF membrane significantly decreased due to the increase of PA cross-linking degree …”

Section: Rational Design Of Nf Membranementioning

confidence: 99%

Nanofiltration for Decolorization: Membrane Fabrication, Applications and Challenges

Cao

Chen

Feng

et al. 2020

Ind. Eng. Chem. Res.

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Decolorization is important for wastewater treatment and product purification. Compared to an adsorption method using activated carbon and ion-exchange resin, nanofiltration (NF) is a sustainable technique for decolorization because it enables dyes/pigments recovery (rather than disposal as waste) via a simpler and greener approach. However, the large-scale application of NF for decolorization is limited by insufficient separation selectivity and operational stability of the commercially available NF membranes as well as incomplete NF-based decolorization processes. Many efforts, therefore, have been dedicated to developing high-performance NF membranes for decolorization and establishing an integrated process for increasing resource recovery efficiency. This review summarizes recent progress on NF membrane fabrication and applications in dye wastewater treatment and bioproduct manufacturing. Besides, the existing challenges and future research directions in NF for decolorization are pointed out. This review is expected to provide an overview and guidance on the development of eligible NF membranes and processes for decolorization to achieve cleaner production.

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High-performance polyamide thin-film composite nanofiltration membrane: Role of thermal treatment

Cited by 32 publications

References 46 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

Manipulating the separation performance of nanofiltration membranes by coating thickness of organic phase during interfacial polymerization

Nanofiltration for Decolorization: Membrane Fabrication, Applications and Challenges

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