Modeling insights into the role of support layer in the enhanced separation performance and stability of nanofiltration membrane

Liu, Yatao; Liang, Heng; Bai, Langming; Yang, Jiaxuan; Zhu, Xuewu; Luo, Xinsheng; Li, Guibai

doi:10.1016/j.memsci.2022.120681

Cited by 12 publications

(3 citation statements)

References 65 publications

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“…In addition to the common focuses on the optimization of substrates, , IP reaction conditions , and subsequent thermal treatment − for the synthesis of PA active layers, solvent treatment performed on the nascent formed membrane could be a facile and thus highly promising approach to improving membrane performance. As revealed by a few previous studies, − the step of solvent treatment immediately after the IP reaction could involve several effects, which include removing the unreacted monomers from the surface, dissolving some low-molecular-weight PA fragments, and inducing the swelling rearrangement of polymers in the nascent PA layer.…”

Section: Introductionmentioning

confidence: 99%

Hexane Treatment to Facilely Tailor Polyamide Nanofiltration Membrane Performance: The Critical Role of Treatment Duration

et al. 2023

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Facile methods for simultaneously tailoring various properties of nanofiltration (NF) membranes are of great significance for fit-for-purpose membrane design and thus achieving more efficient NF applications. This study revealed that, when preparing polyamide (PA) thin-film composite (TFC) NF membranes, a simple hexane treatment right after the interfacial polymerization reaction could substantially alter membrane properties and enhance separation performance for drinking water treatment, with the degree particularly dependent on the treatment time even in the magnitude of tens of seconds. Hexane rinsing for 5 s could lead to a thinner active layer and achieve more improvement (>60%) of water permeance, while a more effective reduction (∼70%) of membrane surface negative charge density could be realized by hexane soaking for a prolonged time. These property variations rendered the hexane-treated membranes more competitive than representative commercial and lab-made conventional PA membranes for hardness removal. Moreover, the membrane rejection performance for organic micropollutants could be maintained after hexane treatments of varying durations due to the barely unaltered membrane pore sizes. The involved mechanisms include removal of loosely polymerized PA segments and unreacted monomers from the membrane surface and the provision of a solvent environment for the further cross-linking of residual monomers. This study provides a facile strategy and mechanistic insights for the development of TFC membranes with tailored properties for efficient drinking water treatment.

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Section: Introductionmentioning

confidence: 99%

Hexane Treatment to Facilely Tailor Polyamide Nanofiltration Membrane Performance: The Critical Role of Treatment Duration

et al. 2023

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“…The latter has been used for a variety of nanofiltration applications, such as NaCl/Na 2 SO 4 separation [30], purification of amine solutions [31] and even in the presence of various single salts [32]. Liu et al [33] were also able to explore the influence of the surface charge of the support layer on the membrane performance using the DSPM-DE. In the DSPM-DE, the equilibrium distribution at the two membrane interfaces is linked to the transport within the homogeneous polymer matrix described by the extended Nernst-Planck equations.…”

Section: Introductionmentioning

confidence: 99%

Li+ Separation from Multi-Ionic Mixtures by Nanofiltration Membranes: Experiments and Modeling

Hubach,

Pillath,

Knaup

et al. 2023

Modelling

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Aqueous sources like salt lake brines and seawater are the most abundant source for lithium ions and might contribute to the growing demand for lithium for energy storage. By coupling with the increasingly relevant reverse osmosis systems, nanofiltration can provide a promising process alternative to conventional methods such as water evaporation and salt precipitation from ores or brines for this purpose. One possible model for nanofiltration is the solution-diffusion-electromigration model (SDEM). First, the model was parametrized by determining the permeances from simple electrolyte mixtures containing two salts. Then, the SDEM was used to predict the rejections of complex multi-electrolyte solutions that mimic seawater and reverse osmosis brine, without fitting additional parameters to experimental data of this complex mixture. This allowed predicting ion rejections satisfactorily. Negative rejections due to spontaneously generated electric fields in the membrane could also be qualitatively described. In summary, this SDEM modeling can provide an important contribution to the purification of Li+ from aqueous sources.

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“…Models based on ion exchange in membranes are also being studied [ 13 ]. Based on the Donnan–steric-pore model, the influence of physicochemical characteristics was studied, it was shown that a large contribution is made by the support layer created on the basis of polymers [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances on Membranes for Water Purification Based on Carbon Nanomaterials

et al. 2022

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Every year the problem of water purification becomes more relevant. This is due to the continuous increase in the level of pollution of natural water sources, an increase in the population, and sharp climatic changes. The growth in demand for affordable and clean water is not always comparable to the supply that exists in the water treatment market. In addition, the amount of water pollution increases with the increase in production capacity, the purification of which cannot be fully handled by conventional processes. However, the application of novel nanomaterials will enhance the characteristics of water treatment processes which are one of the most important technological problems. In this review, we considered the application of carbon nanomaterials in membrane water purification. Carbon nanofibers, carbon nanotubes, graphite, graphene oxide, and activated carbon were analyzed as promising materials for membranes. The problems associated with the application of carbon nanomaterials in membrane processes and ways to solve them were discussed. Their efficiency, properties, and characteristics as a modifier for membranes were analyzed. The potential directions, opportunities and challenges for application of various carbon nanomaterials were suggested.

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Modeling insights into the role of support layer in the enhanced separation performance and stability of nanofiltration membrane

Cited by 12 publications

References 65 publications

Hexane Treatment to Facilely Tailor Polyamide Nanofiltration Membrane Performance: The Critical Role of Treatment Duration

Hexane Treatment to Facilely Tailor Polyamide Nanofiltration Membrane Performance: The Critical Role of Treatment Duration

Li+ Separation from Multi-Ionic Mixtures by Nanofiltration Membranes: Experiments and Modeling

Recent Advances on Membranes for Water Purification Based on Carbon Nanomaterials

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