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 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.

scholarly journals Zwitterion Co-Polymer PEI-SBMA Nanofiltration Membrane Modified by Fast Second Interfacial Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 269 ◽  
Author(s):  
Yu-Hsuan Chiao ◽  
Tanmoy Patra ◽  
Micah Belle Marie Yap Ang ◽  
Shu-Ting Chen ◽  
Jorge Almodovar ◽  
...  
Keyword(s):  
Thin Film ◽  
Wastewater Treatment ◽  
Large Scale ◽  
Interfacial Polymerization ◽  
Antibacterial Properties ◽  
Operating Conditions ◽  
Nanofiltration Membrane ◽  
Nanofiltration Membranes ◽  
Film Composite ◽  
Thin Film Composite

Nanofiltration membranes have evolved as a promising solution to tackle the clean water scarcity and wastewater treatment processes with their low energy requirement and environment friendly operating conditions. Thin film composite nanofiltration membranes with high permeability, and excellent antifouling and antibacterial properties are important component for wastewater treatment and clean drinking water production units. In the scope of this study, thin film composite nanofiltration membranes were fabricated using polyacrylonitrile (PAN) support and fast second interfacial polymerization modification methods by grafting polyethylene amine and zwitterionic sulfobutane methacrylate moieties. Chemical and physical alteration in structure of the membranes were characterized using methods like ATR-FTIR spectroscopy, XPS analysis, FESEM and AFM imaging. The effects of second interfacial polymerization to incorporate polyamide layer and ‘ion pair’ characteristics, in terms of water contact angle and surface charge analysis was investigated in correlation with nanofiltration performance. Furthermore, the membrane characteristics in terms of antifouling properties were evaluated using model protein foulants like bovine serum albumin and lysozyme. Antibacterial properties of the modified membranes were investigated using E. coli as model biofoulant. Overall, the effect of second interfacial polymerization without affecting the selectivity layer of nanofiltration membrane for their potential large-scale application was investigated in detail.

IMPACTS OF HYDROPHILIC NANOFILLERS ON SEPARATION PERFORMANCE OF THIN FILM NANOCOMPOSITE REVERSE OSMOSIS MEMBRANE

2016 ◽  
Vol 78 (12) ◽  
Author(s):  
C. Y. Chong ◽  
G. S. Lai ◽  
W. J. Lau ◽  
N. Yusof ◽  
P. S. Goh ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Permeability ◽  
Interfacial Polymerization ◽  
Pure Water ◽  
Water Flux ◽  
Water Desalination ◽  
Separation Performance ◽  
Salt Rejection ◽  
Tfc Membrane ◽  
Thin Film Nanocomposite

The membrane technology is still considered a costly method to produce potable water. In view of this, RO membrane with enhanced water permeability without trade-off in salt rejection is desirable as it could further reduce the cost for water desalination. In this study, thin film nanocomposite (TFN) membranes containing 0.05 or 0.10 w/v% hydrophilic nanofillers in polyamide layer were synthesized via interfacial polymerization of piperazine and trimesoyl chloride monomers. The resultant TFN membranes were characterized and compared with a control thin film composite (TFC) membrane. Results from the filtration experiments showed that TFN membranes exhibited higher water permeability, salt rejection and fouling resistance compared to that of the TFC membrane. Excessive amount of nanofillers incorporated in the membrane PA layer however negatively affected the cross-linking in the polymer matrix, thus deteriorating the membrane salt rejection. TFN membrane containing 0.05 w/v% of nanofillers showed better performances than the TFC membrane, recording a pure water flux of 11.2 L/m2∙h, and salt rejection of 95.4%, 97.3% and 97.5% against NaCl, Na2SO4 and MgSO4, respectively. 

Fabrication and characterization of a novel nanofiltration membrane by the interfacial polymerization of 1,4-diaminocyclohexane (DCH) and trimesoyl chloride (TMC)

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40742-40752 ◽  
Author(s):  
Gui-E. Chen ◽  
Yan-Jun Liu ◽  
Zhen-Liang Xu ◽  
Yong-Jian Tang ◽  
Hui-Hong Huang ◽  
...  
Keyword(s):  
Thin Film ◽  
Significant Influence ◽  
Interfacial Polymerization ◽  
Nanofiltration Membrane ◽  
Film Composite ◽  
Thin Film Composite ◽  
Fabrication And Characterization ◽  
Polyamide Membrane ◽  
Trimesoyl Chloride

A novel thin-film composite polyamide membrane for nanofiltration is prepared, and the addition of sodium N-cyclohexylsulfamate is found to have a significant influence on its performance.

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