Development of a chlorine‐resistant polyamide nanofiltration membrane and its field‐test results

Shintani, Takuji; Matsuyama, Hideto; Kurata, Naoki; Ohara, Takayoshi

doi:10.1002/app.27113

Cited by 19 publications

(8 citation statements)

References 6 publications

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“…3 The major separation mechanisms of NF involve a steric (size exclusion) effect and an electrostatic partitioning interaction (Donnan exclusion) between the membrane and an external solution. 4 Therefore, NF has become a promising separation and purification method in water treatment, 5,6 and in the chemical, 7 pharmaceutical, 8,9 petrochemical, 10 and other industries.…”

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confidence: 99%

Polyamide‐imide nanofiltration hollow fiber membranes with elongation‐induced nano‐pore evolution

et al. 2009

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in Wiley InterScience (www.interscience.wiley.com).The molecular design of nanoporous membranes with desired morphology and selectivity has attracted significant interest over the past few decades. A major problem in their applications is the trade-off between sieving property and permeability. Here, we report the discovery of elongation-induced nano-pore evolution during the external stretching of a novel polyamide-imide nanofiltration hollow fiber membrane in a dry-jet wet-spinning process that simultaneously leads to a decreased pore size but increased pure water permeability. The molecular weight cutoff, pore size, and pore size distribution were finely tuned using this approach. AFM and polarized FTIR verified the nano-pore morphological evolution and an enhanced molecular orientation in the surface skin layer. The resultant nanofiltration membranes exhibit highly effective fractionation of the monovalent and divalent ions of NaCl/ Na 2 SO 4 binary salt solutions. More than 99.5% glutathione can be rejected by the nanofiltration membranes at neutral pH, offering the feasibility of recovering this tripeptide.

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confidence: 99%

Polyamide‐imide nanofiltration hollow fiber membranes with elongation‐induced nano‐pore evolution

et al. 2009

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“…The chlorine‐tolerance performance is an important index for measuring NF membranes because free chlorine is extensively applied to the inhibition of bacteria during the water production process . Without chlorine‐tolerant membranes, raw water has to first be dechlorinated before NF and then rechlorinated for continuous disinfection; this is a waste of resources . In this study, we examined the chlorine resistances of the three different NF membranes for long‐term use.…”

Section: Resultsmentioning

confidence: 99%

“…The permeate flux of the optimal membrane increased a lot compared with that of the pure PIP membrane. Nevertheless, these polyamide NF membranes showed a lack of chlorine resistance, which is very significant in the NF membrane area . In urban water supply systems, chlorine is regularly used for sterilization.…”

Section: Introductionmentioning

confidence: 99%

High‐performance composite nanofiltration membranes fabricated via ternary mixture: Complementary preponderance of the fluorine‐containing monomer 2,2′‐bis(1‐hydroxyl‐1‐trifluoromethyl‐2,2,2‐triflutoethyl)‐4,4′‐methylene dianiline and the rigid monomer bisphenol F

Tang

Ding

et al. 2018

J of Applied Polymer Sci

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In a previous study, we proved that tailoring the polyamide backbone stiffness is an effective way to fabricate high‐performance polyamide nanofiltration (NF) membranes. However, in the previous study, we mainly focused on the flat membrane and did not consider its chlorine tolerance. In this study, by regulating the aqueous‐phase compositions in the interfacial polymerization process, chlorine tolerance on NF hollow‐fiber membranes was endowed while the membrane performance stayed high. The experimental results show that when the ratio of Piperazine (PIP)–bisphenol F (BPF)/2,2′‐bis(1‐hydroxyl‐1‐trifluoromethyl‐2,2,2‐triflutoethyl)‐4,4′‐methylene dianiline (BHTTM) was 5:1:4, the NF membrane possessed a permeate flux of 21.0 L m−2 h−1 bar−1 and an Na2SO4 rejection up to 90.0%. X‐ray photoelectron spectroscopy analysis also confirmed that the polymerization degree of the PIP–BPF–BHTTM NF membrane was the highest. Moreover, the NF membrane could tolerate active chlorine to over 10,000 ppm h Cl. After the active chlorine treatment, the permeate flux increased over 30.0 L m−2 h−1 bar−1, and the Na2SO4 rejection was about 90.0%. Although the PIP–BHTTM NF membrane also possessed good chlorine tolerance, its permeate flux (after active chlorine treatment) was only 60% of that of the PIP–BPF–BHTTM NF membrane. Therefore, the PIP–BPF–BHTTM NF membrane possessed a combination of high flux and high chlorine tolerance and showed good potential in water treatment in rigorous environments. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46482.

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“…The rejection of the Na 2 SO 4 is generally higher than the NaCl salt because of size exclusion as the diameter of Na 2 SO 4 salt is higher than that of NaCl salt. 21,32,[39][40][41][42] Membrane E had a 91% rejection of Na 2 SO 4 , whereas Membrane F had a 92% rejection ( Figure 11). Membranes A, B, and C had Na 2 SO 4 rejection of 78%, 89.6%, and 85%, respectively.…”

Section: Rejection Of Na 2 So 4 Salt and Permeate Fluxmentioning

confidence: 99%

Preparation and characterization of thin film composite membranes modified with amine‐functionalized β‐cyclodextrins

Mbuli

Dlamini

Nxumalo

et al. 2012

J of Applied Polymer Sci

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This article describes the preparation and characterization of thin film composite (TFC) membranes for the treatment of water by desalination and removal of organic pollutants. The TFC membranes were prepared using trimesoyl chloride and m‐phenyldiamine. Amine‐functionalized β‐cyclodextrins (CDs) were added to modify membrane flux and rejection. Contact angle measurements demonstrate that the incorporation of the functionalized CDs increased the hydrophilicity of the membrane. All the modified membranes showed improved fluxes with a maximum of 20 L m−2 h−1 compared to 5.59 L m−2 h−1 for the unmodified membranes at a pressure of 100 psi. Further, improved fluxes and salt rejections were achieved (maximum NaCl and Na2SO4 salt rejections were 86% and 94.7%, respectively). Thus, the incorporation of functionalized CDs into TFC membranes improves both the hydrophilicity for minimizing fouling and the rejection of salts without loss of flux. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Development of a chlorine‐resistant polyamide nanofiltration membrane and its field‐test results

Cited by 19 publications

References 6 publications

Polyamide‐imide nanofiltration hollow fiber membranes with elongation‐induced nano‐pore evolution

Polyamide‐imide nanofiltration hollow fiber membranes with elongation‐induced nano‐pore evolution

High‐performance composite nanofiltration membranes fabricated via ternary mixture: Complementary preponderance of the fluorine‐containing monomer 2,2′‐bis(1‐hydroxyl‐1‐trifluoromethyl‐2,2,2‐triflutoethyl)‐4,4′‐methylene dianiline and the rigid monomer bisphenol F

Preparation and characterization of thin film composite membranes modified with amine‐functionalized β‐cyclodextrins

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