Surface modified polyamide nanofiltration membranes with high permeability and stability

Peng, Huawen; Tang, Qingquan; Tang, Sihan; Gong, Jiang; Zhen, Qiang

doi:10.1016/j.memsci.2019.117386

Cited by 75 publications

(15 citation statements)

References 54 publications

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“…At high pH, the diffuse layer filled with OH – and the groups on the membrane surface have less influence on the zeta potential. The same trend is common to see in the literature. , The difference in zeta potential caused by the small number of QA groups was not obvious.…”

Section: Results and Discussionsupporting

confidence: 84%

“…The TFC-0.1 to TFC-0.4 showed a lower water contact angle than TFC-0. The improved hydrophilicity can be attributed to the hydrophilicity of grafted QA groups . In addition, the surface of betaine-grafted membranes is rougher than TFC-0 with ridge structure, which leads to the larger water contact area and lower water contact angle .…”

Section: Results and Discussionmentioning

confidence: 99%

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High-Performance Zwitterionic Nanofiltration Membranes Fabricated via Microwave-Assisted Grafting of Betaine

Huang

Tang

Zeng

et al. 2020

ACS Appl. Mater. Interfaces

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The thin-film composite (TFC) nanofiltration (NF) membrane is a very important method in solving the water crisis. However, the fabrication and industrialization of high-performance NF membranes still remains challenging. In this work, zwitterionic NF membranes via microwave-assisted grafting of betaine was first proposed. The resulting polyamide layer showed leaflike nanostructures after modification. Because of the enlarged permeation area and enhanced hydrophilicity derived from the unique leaflike structure, the optimal membrane permeability reached 40.8 L m −1 h −1 bar −1 . This water permeance was 2.2 times as high as the original polypiperazine-amide membrane, with a Na 2 SO 4 rejection maintained at 97.0%. More importantly, the membrane demonstrated excellent selectivity to monovalent and divalent anions. This zwitterionic membrane fabricated by microwave-assisted grafting of betaine provides new insight for industrial scalable NF membranes with great potentials.

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Section: Results and Discussionsupporting

confidence: 84%

Section: Results and Discussionmentioning

confidence: 99%

High-Performance Zwitterionic Nanofiltration Membranes Fabricated via Microwave-Assisted Grafting of Betaine

Huang

Tang

Zeng

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The results can be compared with the study of Peng et al [28] on nanofiltration membranes of piperazine-trimesoyl chloride polyamide and the modification made by a strong electrolyte monomer containing a multiple of amines and quaternary ammonium. The experimentation of the selectivity is carried out with a solution of 1 g/L of MgCl 2 with a pressure of 6 bars and a temperature of 25 • C and a permeate flow close to 36 L/m 2 •h is achieved, reaching a rejection close to 0.47 before the modification.…”

Section: Membranes Selectivitymentioning

confidence: 99%

Ibuprofen Removal by Graphene Oxide and Reduced Graphene Oxide Coated Polysulfone Nanofiltration Membranes

et al. 2022

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The presence of pharmaceutical products, and their metabolites, in wastewater has become a focus of growing environmental concern. Among these pharmaceutical products, ibuprofen (IBU) is one of the most consumed non-steroidal anti-inflammatory drugs and it can enter the environment though both human and animal consumption, because it is not entirely absorbed by the body, and the pharmaceutical industry wastewater. Nanofiltration has been described as an attractive process for the treatment of wastewater containing pharmaceutical products. In this paper, the modification of a polysulfone nanofiltration membrane by coating with graphene oxide (GO) and reduced graphene oxide (RGO) has been carried out. The morphology and elemental composition of the active layer of unmodified and modified membranes were analyzed by scanning electronic microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX), respectively. Initial characterization membranes was carried out, studying their water permeability coefficient and their permeate flux and rejection coefficients, at different applied pressures, using magnesium chloride solutions. The behavior of both pristine and coated membranes against ibuprofen solutions were analyzed by studying the permeate fluxes and the rejection coefficients at different pressures and at different contaminant concentrations. The results have shown that both GO and RGO coated membranes lead to higher values of ibuprofene rejection than that of uncoated membrane, the latter being the one that presents better results in the studies of permeability, selectivity, and fouling.

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“…Cheng et al, [ 202 ] demonstrated effective divalent ion removal and high selectivity of polyelectrolyte-assisted NF membranes. Modification of polyamide-NF membranes by electrolyte monomer led to improvements in the rejection of Na 2 SO 4 and MgSO 4, and high selective removal of SO 4 2− relative to Cl − [ 203 ]. Applying UV for monomer grafting on the NF membrane is another technique to improve salt rejection in brackish water desalination [ 204 ].…”

Section: Nanofiltrationmentioning

confidence: 99%

Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review

et al. 2021

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Climate change, population growth, and increased industrial activities are exacerbating freshwater scarcity and leading to increased interest in desalination of saline water. Brackish water is an attractive alternative to freshwater due to its low salinity and widespread availability in many water-scarce areas. However, partial or total desalination of brackish water is essential to reach the water quality requirements for a variety of applications. Selection of appropriate technology requires knowledge and understanding of the operational principles, capabilities, and limitations of the available desalination processes. Proper combination of feedwater technology improves the energy efficiency of desalination. In this article, we focus on pressure-driven and electro-driven membrane desalination processes. We review the principles, as well as challenges and recent improvements for reverse osmosis (RO), nanofiltration (NF), electrodialysis (ED), and membrane capacitive deionization (MCDI). RO is the dominant membrane process for large-scale desalination of brackish water with higher salinity, while ED and MCDI are energy-efficient for lower salinity ranges. Selective removal of multivalent components makes NF an excellent option for water softening. Brackish water desalination with membrane processes faces a series of challenges. Membrane fouling and scaling are the common issues associated with these processes, resulting in a reduction in their water recovery and energy efficiency. To overcome such adverse effects, many efforts have been dedicated toward development of pre-treatment steps, surface modification of membranes, use of anti-scalant, and modification of operational conditions. However, the effectiveness of these approaches depends on the fouling propensity of the feed water. In addition to the fouling and scaling, each process may face other challenges depending on their state of development and maturity. This review provides recent advances in the material, architecture, and operation of these processes that can assist in the selection and design of technologies for particular applications. The active research directions to improve the performance of these processes are also identified. The review shows that technologies that are tunable and particularly efficient for partial desalination such as ED and MCDI are increasingly competitive with traditional RO processes. Development of cost-effective ion exchange membranes with high chemical and mechanical stability can further improve the economy of desalination with electro-membrane processes and advance their future applications.

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Surface modified polyamide nanofiltration membranes with high permeability and stability

Cited by 75 publications

References 54 publications

High-Performance Zwitterionic Nanofiltration Membranes Fabricated via Microwave-Assisted Grafting of Betaine

High-Performance Zwitterionic Nanofiltration Membranes Fabricated via Microwave-Assisted Grafting of Betaine

Ibuprofen Removal by Graphene Oxide and Reduced Graphene Oxide Coated Polysulfone Nanofiltration Membranes

Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review

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