Recent developments in nanofiltration membranes based on nanomaterials

Ji, Yan-Li; Qian, Wei; Yu, Yawei; An, Quan‐Fu; Liu, Lifen; Yong, Zhou; Gao, Congjie

doi:10.1016/j.cjche.2017.04.014

Cited by 160 publications

(36 citation statements)

References 123 publications

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“…In the past years, considerable effort has been dedicated to the development and enhancement of hybrid membrane materials [ 7 , 8 ] by the incorporation of nanoparticles [ 9 ]. The interest in such polymer modification is connected with the improvement of the membrane properties, such as permeability coefficients, selectivity, and mechanical properties [ 10 ]. These effects are correlated to the change of the polymer chain mobility, the degree of crystallinity, and the structure of polymer free volume, which interacts with nanoparticles [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

A Study of the Reinforcement Effect of MWCNTs onto Polyimide Flat Sheet Membranes

et al. 2020

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Polyimides rank among the most heat-resistant polymers and find application in a variety of fields, including transportation, electronics, and membrane technology. The aim of this work is to study the structural, thermal, mechanical, and gas permeation properties of polyimide based nanocomposite membranes in flat sheet configuration. For this purpose, numerous advanced techniques such as atomic force microscopy (AFM), SEM, TEM, TGA, FT-IR, tensile strength, elongation test, and gas permeability measurements were carried out. In particular, BTDA–TDI/MDI (Ρ84) co-polyimide was used as the matrix of the studied membranes, whereas multi-wall carbon nanotubes were employed as filler material at concentrations of up to 5 wt.% All studied films were prepared by the dry-cast process resulting in non-porous films of about 30–50 μm of thickness. An optimum filler concentration of 2 wt.% was estimated. At this concentration, both thermal and mechanical properties of the prepared membranes were improved, and the highest gas permeability values were also obtained. Finally, gas permeability experiments were carried out at 25, 50, and 100 °C with seven different pure gases. The results revealed that the uniform carbon nanotubes dispersion lead to enhanced gas permeation properties.

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Section: Introductionmentioning

confidence: 99%

A Study of the Reinforcement Effect of MWCNTs onto Polyimide Flat Sheet Membranes

et al. 2020

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“…Membrane separation is a new eld of technology, including reverse osmosis, nanoltration, ultraltration, electrodialysis, membrane bioreactors, and so on. [1][2][3][4] Membrane separation offers many advantages, e.g. high efficiency, energy saving, environmental protection, simple equipment and easy operation etc., and has been widely used in water treatment, highly efficient substance separation, energy saving and environmental remediation.…”

Section: Introductionmentioning

confidence: 99%

Modification of polyamide TFC nanofiltration membrane for improving separation and antifouling properties

et al. 2018

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In this work, a dendrimer trimesoyl amide amine (TMAAM) monomer was proposed to be used as a key functional monomer to modify the conventional aromatic polyamide thin-film composite (TFC) nanofiltration (NF) membrane, and a new kind of TMAAM-based semi-aromatic polyamide composite NF membrane was thus prepared by interfacial polymerization. The effects of the PIP/TMAAM ratio (PIP ¼ piperazine) on the membrane chemical structure, surface properties and separation performances were investigated systematically. With the increase in TMAAM content loaded in the membrane, the water flux strongly increased but the salt rejection decreased only slightly. When the PIP/TMAAM ratio was 1, the membrane NF-2 exhibited a smoother and more hydrophilic surface, as a result of which it displayed an optimum separation performance for different valent salts. In addition, the TMAAM modified TFC membrane presented an extremely high rejection to negatively charged dye molecules and high permeation for monovalent salts, leading to good prospects for dye/salt separation application. Moreover, both the water flux and salt rejection of the TMAAM-based membrane were stable in a longterm running process, and the membrane showed a favourable anti-fouling property and efficient cleaning recovery. Therefore, this work provides a new type of semi-aromatic polyamide composite NF membrane fabricated by a facile and straightforward method via interfacial polymerization with high hydrophilicity, good stability and strong anti-fouling property.

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“…It is remarkable that new NF membranes are emerging, membranes with higher permeability and hydrophilicity and narrow pore size distribution. The introduction of carbonbased nanomaterials (e.g., carbon nanotubes, graphene, nanocomposite membranes) will show improved permeability and mechanical/thermal stability [30]. Wang et al [16] synthesized NF membranes with high permeability (350 L/h/m²/MPa) but the rejection with saline solutions was near that with traditional polyamide membranes.…”

Section: Experimentation To Evaluate Nf Rejection and Permeate Fluxmentioning

confidence: 99%

Is nanofiltration better than reverse osmosis for removal of fluoride from brackish waters to produce drinking water?

Brião¹,

Cuenca²,

Pandolfo³

et al. 2019

Desalination and Water Treatment

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In this paper, nanofiltration (NF) was investigated as a suitable technology for defluoridating brackish groundwater. A comparison between NF and reverse osmosis (RO) was performed to evaluate which method is the best for removing fluorine from groundwater to produce drinking water. Although NF employs a membrane that requires a low amount of energy, both NF and RO have advantages and limitations. NF and RO have similar costs for desalinating brackish water, and thus both the membranes can be used for this aim, but we believe that this will change with the next generation of NF membranes.

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Recent developments in nanofiltration membranes based on nanomaterials

Cited by 160 publications

References 123 publications

A Study of the Reinforcement Effect of MWCNTs onto Polyimide Flat Sheet Membranes

A Study of the Reinforcement Effect of MWCNTs onto Polyimide Flat Sheet Membranes

Modification of polyamide TFC nanofiltration membrane for improving separation and antifouling properties

Is nanofiltration better than reverse osmosis for removal of fluoride from brackish waters to produce drinking water?

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