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 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.

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 A novel positively charged composite nanofiltration membrane based on polyethyleneimine with a tunable active layer structure developed via interfacial polymerization

RSC Advances ◽  
2019 ◽  
Vol 9 (19) ◽  
pp. 10796-10806 ◽  
Author(s):  
Zhibin Jiang ◽  
Jing Miao ◽  
Yuantao He ◽  
Kai Tu ◽  
Shunquan Chen ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Active Layer ◽  
Organic Phase ◽  
Interfacial Polymerization ◽  
Layer Structure ◽  
Nanofiltration Membrane ◽  
Positively Charged

The tunable active layer structure was developed via interfacial polymerization, using polyethyleneimine as the monomer of the aqueous phase, and a mixture of isophthaloyl dichloride and tri-mesoyl chloride as the monomer of the organic phase.

Nanoscale Hollow-Bubbly Polypyrrole Obtained via Interfacial Polymerization with Phase Transfer Catalyst

2014 ◽  
Vol 809-810 ◽  
pp. 114-121
Author(s):  
Deng Pan Dong ◽  
Qing Hao Yang ◽  
Lin Tao Yang ◽  
Zhen Zhong Hou ◽  
Zhong Yi Tu
Keyword(s):  
Aqueous Phase ◽  
Organic Phase ◽  
Interfacial Polymerization ◽  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Cyclic Voltammograms ◽  
Scanning Electronic Microscopy ◽  
Defect Control ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Crown ether 18C6 was used as a phase transfer catalyst (PTC) for the interfacial polymerization of polypyrrole (PPy). Usually, in interfacial reacting system, oxidant FeCl3was dissolved in deionized water to form aqueous phase, while pyrrole was dissolved in chloroform to form organic phase. The 18C6 PTC can efficiently form complexes with Fe (III) and transfer Fe (III) from aqueous phase into organic phase, resulting in nanoscale hollow-bubbly PPy with better electronic properties. UV-vis was used to confirm the phase transfer ability of composed Fe (III). Cyclic Voltammograms (CVs) were used to characterize capacitance property of PPy. Fourier Transition Infrared (FT-IR) spectroscopy and Scanning Electronic Microscopy (SEM) were carried out to investigate the microstructure of PPy. Finally, defect control migration growth mechanism of PPy during the polymerization has been carefully discussed.

Preparation and Characterization of the Tri-Channel Hollow Fiber Charged Mosaic Membrane

2010 ◽  
Vol 150-151 ◽  
pp. 1315-1320 ◽  
Author(s):  
Jian Mian Deng ◽  
Jin Dun Liu ◽  
Hao Qin Zhang ◽  
Ya Tao Zhang ◽  
Dong Cheng
Keyword(s):  
Aqueous Phase ◽  
Organic Phase ◽  
Hollow Fiber ◽  
Interfacial Polymerization ◽  
Xylenol Orange ◽  
Uniform Design ◽  
Water Flux ◽  
Composite Layer ◽  
High Water ◽  
Sulfonate Group

Charged mosaic membrane (CMM) has high water flux, low salt retention and high organic rejection. The tri-channel hollow fiber charged-mosaic membrane (CMM) was prepared by interfacial polymerization (IP). The tri-channel polysulfone (PSF) hollow fiber ultrafiltration(UF) membrane was used as the support membrane. Polyethylenimine (PEI), 2, 5-diamino-benzenesulfonic acid (DIA) and basic fuchsin (BF) were used as aqueous phase monomer. Trimesoyl chloride (TMC) was used as organic phase monomer. ATR-IR, scanning electron microscope (SEM) and gas sorption analyzer (GSA) were applied in structural analysis of CMM. The uniform design and SPSS were applied in membrane preparation and data analysis.The polymer ATR-IR spectroscopy shows IP occurrence between aqueous phase monomer and organic phase monomer. Polymer contains both sulfonate group and quaternary ammonium group. It show that the membrane has the feature of CMM. Regression equation was gained, and it shows the CMM retention would enhance with the concentration increase of DIA, PEI and SDS and decrease with concentration decrease of FB in experimental range. The composite layer can be observed from membrane SEM after IP. The CMM retention to NaCl, polyethylene glycol(PEG), Xylenol orange and Methyl chloride is12.4%, 90%, 96%,88% and 88.2% respectively.

scholarly journals Incorporation of layered double nanomaterials in thin film nanocomposite nanofiltration membrane for magnesium sulphate removal

2018 ◽  
Vol 34 ◽  
pp. 02003 ◽  
Author(s):  
Muhammad Hanis Tajuddin ◽  
Norhaniza Yusof ◽  
Wan Norharyati Wan Salleh ◽  
Ahmad Fauzi Ismail ◽  
Nur Hanis Hayati Hairom ◽  
...  
Keyword(s):  
Thin Film ◽  
Magnesium Sulphate ◽  
Interfacial Polymerization ◽  
Membrane Surface ◽  
Water Flux ◽  
Morphological Structure ◽  
Separation Performance ◽  
Surface Hydrophilicity ◽  
Double Hydroxides ◽  
Thin Film Nanocomposite

Thin film nanocomposite (TFN) membrane with copper-aluminium layered double hydroxides (LDH) incorporated into polyamide (PA) selective layer has been prepared for magnesium sulphate salt removal. 0, 0.05, 0.1, 0.15, 0.2 wt% of LDH were dispersed in the trimesoyl chloride (TMC) in n-hexane as organic solution and embedded into PA layer during interfacial polymerization with piperazine. The fabricated membranes were further characterized to evaluate its morphological structure and membrane surface hydrophilicity. The TFN membranes performance were evaluated with divalent salt magnesium sulphate (MgSO4) removal and compared with thin film composite (TFC). The morphological structures of TFN membranes were altered and the surface hydrophilicity were enhanced with addition of LDH. Incorporation of LDH has improved the permeate water flux by 82.5% compared to that of TFC membrane with satisfactory rejection of MgSO4. This study has experimentally validated the potential of LDH to improve the divalent salt separation performance for TFN membranes.

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.

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