Graphene oxide-in-polymer nanofiltration membranes with enhanced permeability by interfacial polymerization

Hu, Ruirui; Zhang, Rujing; He, Yijia; Zhao, Guoke; Zhu, Hongwei

doi:10.1016/j.memsci.2018.07.087

Cited by 110 publications

(50 citation statements)

References 36 publications

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“…What's more, the electrostatic interaction between SO4 2-and the polyamide negative surface is stronger than Cl -, leading to the high rejections of Na2SO4 and MgSO4 (exceed above 97.2%). In summary, the as-prepared NF membranes provide the great chance to break out the "trade-off" behavior of the traditional polyamide membranes, showing the high water permeation flux, and maintaining the superior inorganic salts rejection rate (as shown in Figure 5c) [39].…”

Section: Resultsmentioning

confidence: 92%

“…Water permeation flux of the as-prepared NF membranes with (a) the hydrophilic modified interlayers on the porous substrates or (b) the addition of macromolecular additives in the aqueous PIP solution (test conditions: inorganic salts concentration = 1000 mg/L, pH = 6.0, 25 °C, applied pressure = 0.6 MPa and cross-flow rate = 30 L/h) (c) the comparison of the NF performance with other thin-film composite membranes in the reported literature[39].…”

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confidence: 99%

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Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

Yang¹

2019

Preprint

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The interfacial polymerization (IP) of piperazine (PIP) and trimesoyl chloride (TMC) has been extensively utilized to synthesize the nanofiltration (NF) membrane. However, it is still a huge challenge to monitor the IP reaction, because of the fast reaction rate and the formed ultra-thin film. Herein, two effective strategies are applied to reduce the IP reaction rate: (1) the introduction of hydrophilic interlayers between the porous substrate and the formed polyamide layer; (2) the addition of macromolecular additives in the aqueous solution of PIP. As a result, in-situ FT-IR spectroscopy was firstly used to monitor the IP reaction of PIP/TMC reaction system, with hydrophilic interlayers or macromolecular additives. Moreover, we study the formed polyamide layer growth on the substrate, in a real-time manner. The in-situ FT-IR experimental results confirm that the IP reaction rates are effectively suppressed and the formed polyamide thickness reduces from 138±24 nm to 46±2 nm. Furthermore, the optimized NF membrane with excellent performance are consequently obtained, which include the boosted water permeation flux about 141~238 (L·m2·h/MPa) and superior salt rejection of Na2SO4 > 98.4%.

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Section: Resultsmentioning

confidence: 92%

mentioning

confidence: 99%

Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

Yang¹

2019

Preprint

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“…Nevertheless, for doped polyamide layers with the macromolecular additives added in the aqueous PIP solution, the polyamide layer top structures were comparatively denser, with the lower O/N ratio and higher cross-linking degree (shown in Table S5 in the Supporting Information) [38]. [30,39].…”

Section: Resultsmentioning

confidence: 99%

Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

Yang¹

2020

Preprint

View full text Add to dashboard Cite

The interfacial polymerization (IP) of piperazine (PIP) and trimesoyl chloride (TMC) has been extensively utilized to synthesize nanofiltration (NF) membranes. However, it is still a huge challenge to monitor the IP reaction, because of the fast reaction rate and the formed ultra-thin film. Herein, two effective strategies were applied to reduce the IP reaction rate: (1) the introduction of hydrophilic interlayers between the porous substrate and the formed polyamide layer, and (2) the addition of macromolecular additives in the aqueous solution of PIP. As a result, in situ Fourier transform infrared (FT-IR) spectroscopy was firstly used to monitor the IP reaction of PIP/TMC with hydrophilic interlayers or macromolecular additives in the aqueous solution of PIP. Moreover, the formed polyamide layer growth on the substrate was studied in a real-time manner. The in situ FTIR experimental results confirmed that the IP reaction rates were effectively suppressed and that the formed polyamide thickness was reduced from 138 ± 24 nm to 46 ± 2 nm according to TEM observation. Furthermore, an optimized NF membrane with excellent performance was consequently obtained, which included boosted water permeation of about 141–238 (L/m2·h·MPa) and superior salt rejection of Na2SO4 > 98.4%.

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“…In this vein, the observation of our unimpeded RO‐GO membrane can be mainly attributed to the extremely high water permeability of GO−S nanochannels, which can overwhelm the flux loss by hydrodynamic resistance. In addition, it has been widely recognized that membrane flux is also affected by membrane surface roughness and hydrophilicity, and the rougher and more hydrophilic surface facilitate to attract more water entering into membranes so as to the improvement of water flux . According to the characterizations of surface properties in Figure , GO thin coatings could improve the hydrophilicity but reduce the roughness of RO membranes, while GO thick coatings affect exactly in the opposite way.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, it has been widely recognized that membrane flux is also affected by membrane surface roughness and hydrophilicity, and the rougher and more hydrophilic surface facilitate to attract more water entering into membranes so as to the improvement of water flux. [36] According to the characterizations of surface properties in Figure 2, GO thin coatings could improve the hydrophilicity but reduce the roughness of RO membranes, while GO thick coatings affect exactly in the opposite way. As a result, both GO coated RO membrane produced no effect on the pristine flux of RO membranes.…”

Section: Membrane Filtration Performancementioning

confidence: 99%

Facile Fabrication of Unimpeded and Stable Graphene Oxide Coating on Reverse Osmosis Membrane for Dual‐Functional Protection

Wang

Liu

et al. 2018

ChemistrySelect

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Membrane fouling and chlorination have remained the greatest threats to durable reverse osmosis (RO) membrane applications. Here, we report a facile technique of high pressure assisted deposition (HPSD) to physically anchor stable graphene oxide (GO) coatings on RO membranes for simultaneous dual‐functional protection against fouling and chlorination without sacrifice of water flux. Thick coatings were directly prepared by HPSD, and a subsequent “skin‐removing” method was used to obtain GO thin coatings with stronger adhesion. The measurement of GO coating thickness was achieved by a “removing‐transferring” method, demonstrating a thickness of 200 and 50 nm for GO thick and thin coatings, respectively. Benefiting from our coating deposition technique of HPSD, 100% of coverage by GO was achieved for both GO coated membranes. The filtration test showed that GO coating was highly permeable to water resulted from the optimized small size of GO sheets (∼200 nm) and the unique water transport properties through GO laminates. The GO thin coating could effectively alleviate the membrane fouling by rendering membrane surface more hydrophilic and smoother, while the thick coating reversely aggravated the fouling due to the more hydrophobic surface. In addition, GO coating could dramatically improve the chlorine stability of RO membrane by impeding the diffusion of reactive chlorine, with a high level of salt rejection after chlorination for GO coated membranes.

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Graphene oxide-in-polymer nanofiltration membranes with enhanced permeability by interfacial polymerization

Cited by 110 publications

References 36 publications

Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

Facile Fabrication of Unimpeded and Stable Graphene Oxide Coating on Reverse Osmosis Membrane for Dual‐Functional Protection

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