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

2019 ◽  
Vol 137 (2) ◽  
pp. 48284 ◽  
Author(s):  
Xin Cheng ◽  
Qiaoming Pan ◽  
Tao Liu ◽  
Huifen Tan ◽  
Wenchao Liu
Keyword(s):  
Organic Phase ◽  
Coating Thickness ◽  
Interfacial Polymerization ◽  
Separation Performance ◽  
Nanofiltration Membranes

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 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 Preparation of cellulose nanofiltration membranes and their removal of typical pollutants from drinking water

2021 ◽  
Author(s):  
Rengui Weng ◽  
Feng Tian ◽  
Xin Huang ◽  
Liufang Ni ◽  
Beidou Xi
Keyword(s):  
Drinking Water ◽  
Interfacial Polymerization ◽  
Raw Materials ◽  
Chloroacetic Acid ◽  
Separation Performance ◽  
Nanofiltration Membrane ◽  
Nanofiltration Membranes ◽  
Salt Ions ◽  
First Choice ◽  
Cellulose Membranes

Abstract Cellulose membranes have the advantages of good hydrophilicity, excellent mechanical properties, and biodegradability. Therefore, they are the first choice to replace petroleum polymer membranes. In this study, cellulose (BC) and chitosan (CS) were used as raw materials, and N-methylmorpholine-N-oxide (NMMO) was used as solvent. A new kind of cellulose nanofiltration membrane (BC-NFM), cellulose/chitosan nanofiltration membrane (BC/CS-NFM), and interfacial polymerized cellulose/chitosan composite nanofiltration membrane (IP-BC/CS-NFM) were successfully prepared by NaOH hydrolysis and chloroacetic acid carboxymethylation modification, piperazine (PIP), and 1,3,5-trimellitic chloride (TMC) interfacial polymerization, respectively. These two methods were used for the preparation of cellulose nanofiltration membranes for the first time.We also studied their structure, separation performance and their capacity to remove typical pollutants. The results showed that obvious holes appeared on the surface of the nanofiltration membrane obtained by alkali hydrolysis and chloroacetic acid carboxymethylation modification, and the cross-section showed a spongelike structure. The surface of the nanofiltration membrane obtained by interfacial polymerization formed a rough and dense separation layer. The rejection rates of the three kinds of nanofiltration membranes were all over 30% for monovalent salt ions, over 60% for divalent salt ions, over 92% for methyl orange, and over 98% for methyl blue. They had good removal effects for typical pollutants in drinking water.

Preparation and Co (II) Removal of ZnO/Poly-Piperazineamide Nanofiltration Membranes

2017 ◽  
Author(s):  
Xiaoguang Zhang ◽  
Xuexing Chen ◽  
Qingchun Chen ◽  
Zhaolong Deng ◽  
Yan Liu ◽  
...  
Keyword(s):  
Reaction Time ◽  
Monomer Concentration ◽  
Attenuated Total Reflection ◽  
Radioactive Nuclide ◽  
Separation Performance ◽  
Separation Mechanism ◽  
Nanofiltration Membranes ◽  
Terephthaloyl Chloride ◽  
Nano Zno ◽  
Zno Particles

A series of nanofiltration membranes were prepared by interfacial polymerization of piperazine and terephthaloyl chloride on the surface of polyacrylonitrile (PAN) ultrafiltration membranes. ZnO nanoparticles were incorporated in the active separation layer to modify the performances of the membranes. The preparation conditions as the monomer concentration, dosage of nano-ZnO particles and the reaction time on removal of a simulated radioactive nuclide Co (II) were investigated. Fourier transform infrared in attenuated total reflection mode verified the formation of polyamide on the PAN ultrafiltration membrane. The scanning electron microscope images showed that the nano-ZnO particles can homogeneously fixed on the membrane surface. The retention of Co (II) increased with increasing the dosage of nano-ZnO in the range of 0∼0.03 g. Further adding more nano-ZnO, the rejection rate of Co (II) first decreased and then increased. The concentration of piperazine and terephthaloyl chloride showed similar effect on removal of Co (II) ion. 5 minutes polymerization time was sufficient to form an active separation layer on the substrate membrane which changed the separation mechanism from ultrafiltration to nanofiltration. The separation performance of NF3 prepared by the following conditions was optimum: 0.03g nano-ZnO, 0.6 wt% piperazine, 0.5 wt% terephthaloyl chloride, and the reaction time was 15 min. The rejection rates of 1000 mg/L Na2SO4 and Co2+ in CoCl2 solution were 90% and 75% respectively. The Co (II) removal rate can be increased to nearly 90% by using ethylenediaminetetraacetic acid disodium salt. Increasing the operation pressure or the feeding concentration of Co (II) can also improve the performances of the membranes in this experiment.

Dopamine composite nanofiltration membranes prepared by self-polymerization and interfacial polymerization

2014 ◽  
Vol 465 ◽  
pp. 41-48 ◽  
Author(s):  
Jiaojiao Zhao ◽  
Yanlei Su ◽  
Xin He ◽  
Xueting Zhao ◽  
Yafei Li ◽  
...  
Keyword(s):  
Interfacial Polymerization ◽  
Nanofiltration Membranes

scholarly journals Hydrogel assisted interfacial polymerization for advanced nanofiltration membranes

2020 ◽  
Vol 8 (6) ◽  
pp. 3238-3245 ◽  
Author(s):  
Shushan Yuan ◽  
Gang Zhang ◽  
Junyong Zhu ◽  
Natalie Mamrol ◽  
Suilin Liu ◽  
...  
Keyword(s):  
Thin Film ◽  
Aqueous Phase ◽  
Composite Membrane ◽  
Interfacial Polymerization ◽  
Nanofiltration Membranes ◽  
Film Composite ◽  
Thin Film Composite Membrane ◽  
Thin Film Composite

This study demonstrates the application of a hydrogel as the aqueous phase in interfacial polymerization for the synthesis of a thin film composite membrane with ultrahigh permeability.

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