A nanofiltration membrane fabricated on the surfactant activated substrate with improved separation performance and acid-resistance

2021 ◽  
Author(s):  
Lu Bai ◽  
Min Wang ◽  
Hongjun Yang ◽  
Jun Zheng Peng ◽  
Youjing Zhao ◽  
...  
Keyword(s):  
Interfacial Polymerization ◽  
Acid Resistance ◽  
Separation Performance ◽  
Nanofiltration Membrane

An acid resistance nanofiltration (NF) membrane with higher permeability and rejection is of great significance. NF membrane was prepared by interfacial polymerization under the assistance of surfactants, three different common...

scholarly journals An acid-stable positively charged polysulfonamide nanofiltration membrane prepared by interfacial polymerization of polyallylamine and 1,3-benzenedisulfonyl chloride for water treatment

RSC Advances ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 2042-2054 ◽  
Author(s):  
Hao Wang ◽  
Zhong Wei ◽  
Heyun Wang ◽  
Haoji Jiang ◽  
Yinchun Li ◽  
...  
Keyword(s):  
Water Treatment ◽  
Metal Ions ◽  
Interfacial Polymerization ◽  
Divalent Metal ◽  
Separation Performance ◽  
Nanofiltration Membrane ◽  
Divalent Metal Ions ◽  
Acid Stable ◽  
Positively Charged

Here, an acid stable PSA membrane with positively charge was prepared through the IP between macromolecular PAH and BDSC on PES substrate. In addition, the PSA membrane exhibited excellent separation performance to divalent metal ions.

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.

scholarly journals Preparation of a novel zwitterionic striped surface thin-film composite nanofiltration membrane with excellent salt separation performance and antifouling property

RSC Advances ◽  
2020 ◽  
Vol 10 (27) ◽  
pp. 16168-16178
Author(s):  
Bo Lin ◽  
Huifen Tan ◽  
Wenchao Liu ◽  
Congjie Gao ◽  
Qiaoming Pan
Keyword(s):  
Thin Film ◽  
Interfacial Polymerization ◽  
Separation Performance ◽  
Nanofiltration Membrane ◽  
Film Composite ◽  
Thin Film Composite ◽  
Antifouling Property

Thin-film composite (TFC) nanofiltration (NF) membranes with zwitterionic striped surface were fabricated via the co-deposition and interfacial polymerization.

Polyamide nanofiltration membrane with high separation performance prepared by EDC/NHS mediated interfacial polymerization

2013 ◽  
Vol 427 ◽  
pp. 92-100 ◽  
Author(s):  
Jinming Peng ◽  
Yanlei Su ◽  
Wenjuan Chen ◽  
Xueting Zhao ◽  
Zhongyi Jiang ◽  
...  
Keyword(s):  
Interfacial Polymerization ◽  
Separation Performance ◽  
Nanofiltration Membrane ◽  
High Separation

scholarly journals Enhancing H2O2 Tolerance and Separation Performance through the Modification of the Polyamide Layer of a Thin-Film Composite Nanofiltration Membrane by Using Graphene

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 592
Author(s):  
Yi-Li Lin ◽  
Nai-Yun Zheng ◽  
Yu-Shen Chen
Keyword(s):  
Thin Film ◽  
Water Permeability ◽  
Interfacial Polymerization ◽  
Membrane Surface ◽  
Separation Performance ◽  
Nanofiltration Membrane ◽  
Permeate Flux ◽  
Film Composite ◽  
Salt Rejection ◽  
Thin Film Composite

Through interfacial polymerization (IP), a polyamide (PA) layer was synthesized on the top of a commercialized polysulfone substrate to form a thin-film composite (TFC) nanofiltration membrane. Graphene oxide (GO) was dosed during the IP process to modify the NF membrane, termed TFC-GO, to enhance oxidant resistance and membrane performance. TFC-GO exhibited increased surface hydrophilicity, water permeability, salt rejection, removal efficiency of pharmaceutical and personal care products (PPCPs), and H2O2 resistance compared with TFC. When H2O2 exposure was 0–96000 ppm-h, the surfaces of the TFC and TFC-GO membranes were damaged, and swelling was observed using scanning electron microscopy. However, the permeate flux of TFC-GO remained stable, with significantly higher NaCl, MgSO4, and PPCP rejection with increasing H2O2 exposure intensity than TFC, which exhibited a 3.5-fold flux increase with an approximate 50% decrease in salt and PPCP rejection. GO incorporated into a PA layer could react with oxidants to mitigate membrane surface damage and increase the negative charge on the membrane surface, resulting in the enhancement of the electrostatic repulsion of negatively charged PPCPs. This hypothesis was confirmed by the significant decrease in PPCP adsorption onto the surface of TFC-GO compared with TFC. Therefore, TFC-GO membranes exhibited superior water permeability, salt rejection, and PPCP rejection and satisfactory resistance to H2O2, indicating its great potential for practical applications.

scholarly journals Two-dimensional fractal nanocrystals templating for substantial performance enhancement of polyamide nanofiltration membrane

2021 ◽  
Vol 118 (37) ◽  
pp. e2019891118
Author(s):  
Yang Lu ◽  
Ruoyu Wang ◽  
Yuzhang Zhu ◽  
Zhenyi Wang ◽  
Wangxi Fang ◽  
...  
Keyword(s):  
Performance Enhancement ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Practical Method ◽  
Curing Temperature ◽  
Polymerization Process ◽  
Nanofiltration Membrane ◽  
Two Dimensional ◽  
Fractal Structures ◽  
Templating Method

In this study, we report the emergence of two-dimensional (2D) branching fractal structures (BFS) in the nanoconfinement between the active and the support layer of a thin-film-composite polyamide (TFC-PA) nanofiltration membrane. These BFS are crystal dendrites of NaCl formed when salts are either added to the piperazine solution during the interfacial polymerization process or introduced to the nascently formed TFC-PA membrane before drying. The NaCl dosing concentration and the curing temperature have an impact on the size of the BFS but not on the fractal dimension (∼1.76). The BFS can be removed from the TFC-PA membranes by simply dissolving the crystal dendrites in deionized water, and the resulting TFC-PA membranes have substantially higher water fluxes (three- to fourfold) without compromised solute rejection. The flux enhancement is believed to be attributable to the distributed reduction in physical binding between the PA active layer and the support layer, caused by the exertion of crystallization pressure when the BFS formed. This reduced physical binding leads to an increase in the effective area for water transport, which, in turn, results in higher water flux. The BFS-templating method, which includes the interesting characteristics of 2D crystal dendrites, represents a facile, low-cost, and highly practical method of enhancing the performance of the TFC-PA nanofiltration membrane without having to alter the existing infrastructure of membrane fabrication.

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