scholarly journals Nano-ZnO impregnated inorganic–polymer hybrid thinfilm nanocomposite nanofiltration membranes: an investigation of variation in structure, morphology and transport properties

RSC Advances ◽  
2015 ◽  
Vol 5 (43) ◽  
pp. 34134-34151 ◽  
Author(s):  
Avishek Pal ◽  
T. K. Dey ◽  
Anshu Singhal ◽  
R. C. Bindal ◽  
P. K. Tewari
Keyword(s):  
Transport Properties ◽  
Organic Phase ◽  
Interfacial Polymerization ◽  
Inorganic Polymer ◽  
Nanofiltration Membranes ◽  
Nano Zno ◽  
Polymer Hybrid ◽  
Structure Morphology ◽  
Trimesoyl Chloride

TFN-NF membranes prepared byin situinterfacial polymerization of branched polyethyleneimine and trimesoyl chloride, with simultaneous impregnation of as-synthesized hexagonal wurtzite nano-ZnO either through aqueous or organic phase.

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

2019 ◽  
Author(s):  
Xi Yang
Keyword(s):  
Ir Spectroscopy ◽  
Reaction Rate ◽  
Interfacial Polymerization ◽  
Reaction System ◽  
Reaction Rates ◽  
Water Permeation ◽  
Ft Ir ◽  
Trimesoyl Chloride ◽  
Ft Ir Spectroscopy

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%.

Graphene oxide-embedded polyamide nanofiltration membranes for selective ion separation

2017 ◽  
Vol 5 (48) ◽  
pp. 25632-25640 ◽  
Author(s):  
Ruirui Hu ◽  
Yijia He ◽  
Cuimiao Zhang ◽  
Rujing Zhang ◽  
Jing Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Water Permeability ◽  
Interfacial Polymerization ◽  
Ion Selectivity ◽  
Nanofiltration Membranes ◽  
Ion Separation

Graphene oxide modified piperazine nanofiltration membranes are prepared by in situ interfacial polymerization and show improved water permeability and ion selectivity performance.

scholarly journals The Preparation of High-Performance and Stable MXene Nanofiltration Membranes with MXene Embedded in the Organic Phase

Membranes ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 2
Author(s):  
Qiang Xue ◽  
Kaisong Zhang
Keyword(s):  
Aqueous Phase ◽  
Organic Phase ◽  
Negative Charge ◽  
Interfacial Polymerization ◽  
Water Immersion ◽  
Membrane Surface ◽  
Polymerization Reaction ◽  
Future Research ◽  
Separation Performance ◽  
Nanofiltration Membranes

Nanomaterials embedded in nanofiltration membranes have become a promising modification technology to improve separation performance. As a novel representation of two-dimensional (2D) nanomaterials, MXene has nice features with a strong negative charge and excellent hydrophilicity. Our previous research showed that MXene nanosheets were added in the aqueous phase, which enhanced the permeselectivity of the membrane and achieved persistent desalination performance. Embedding the nanomaterials into the polyamide layer through the organic phase can locate the nanomaterials on the upper surface of the polyamide layer, and also prevent the water layer around the hydrophilic nanomaterials from hindering the interfacial polymerization reaction. We supposed that if MXene nanosheets were added in the organic phase, MXene nanosheets would have more negative contact sites on the membrane surface and the crosslinking degree would increase. In this study, MXene were dispersed in the organic phase with the help of ultrasound, then MXene nanocomposite nanofiltration membranes were achieved. The prepared MXene membranes obtained enhanced negative charge and lower effective pore size. In the 28-day persistent desalination test, the Na2SO4 rejection of MXene membrane could reach 98.6%, which showed higher rejection compared with MXene embedded in aqueous phase. The results of a long-time water immersion test showed that MXene membrane could still maintain a high salt rejection after being soaked in water for up to 105 days, which indicated MXene on the membrane surface was stable. Besides MXene membrane showed high rejection for high-concentration brine and good mono/divalent salt separation performance in mono/divalent mixed salt solutions. As a part of the study of MXene in nanofiltration membranes, we hoped this research could provide a theoretical guidance for future research in screening different addition methods and different properties.

scholarly journals Enhanced flux performance of polyamide composite membranes prepared via interfacial polymerization assisted with ethyl formate

2017 ◽  
Vol 76 (7) ◽  
pp. 1884-1894 ◽  
Author(s):  
Zhaofeng Liu ◽  
Guiru Zhu ◽  
Yulin Wei ◽  
Dapeng Zhang ◽  
Lei Jiang ◽  
...  
Keyword(s):  
Reaction Zone ◽  
Organic Phase ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Composite Membranes ◽  
Ethyl Formate ◽  
Water Contact ◽  
Tfc Membrane ◽  
High Level ◽  
Trimesoyl Chloride

A novel thin film composite (TFC) polyamide reverse osmosis membrane was prepared via the interfacial polymerization of m-phenylene diamine (MPD) in aqueous phase and 1,3,5-trimesoyl chloride (TMC) in organic phase on a polysulfone ultrafiltration support by assisting with ethyl formate as a co-solvent added in the organic phase. The ethyl formate added in the organic phase is intended to form a narrow miscibility zone, which leads to the thicker reaction zone. The multi-layered loose polyamide structure with larger pore size was formed due to the thicker reaction zone and lower content of MPD. The enhanced hydrophilicity of the membrane was proved by the decreased water contact angle. Water flux was measured at 1.6 MPa with 2,000 ppm NaCl aqueous solution. Compared to the TFC membrane prepared without ethyl formate, the water flux across the TFC membrane with ethyl formate in the organic phase increased with the increased ethyl formate content (from 23 to 45 L/(m2 h)) and the salt rejection remained at a high level (>90%). The ethyl formate can be used as a co-solvent to effectively enhance the performance of the TFC membrane.

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