Prediction of salt rejection by nanofiltration and reverse osmosis membranes using Spiegler-Kedem model and an optimisation procedure

Zouhri, N.; Igouzal, Mohamed; Larif, Majdouline; Hafsi, M.; Taky, Mohamed; Elmidaoui, A.

doi:10.5004/dwt.2018.21410

Cited by 6 publications

(1 citation statement)

References 12 publications

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“…This process produces a tight separation layer of the composite membranes where the selective separation of salts or low molecular weight molecules from a mixed feed is not always feasible. They often result in moderate to high salt rejection (rejection of monovalent salts: 30–60%; divalent salts: 95–99%) . As an example, polyethyleneimine (PEI) TFC membranes show much higher MWCO, but still holds higher rejection of mono‐ and multivalent salts and high water flux of 9.5 L m −2 h −1 bar −1 .…”

Section: Water Permeance and Molecular Separation Behavior Of The Polmentioning

confidence: 99%

Large Area Self‐Assembled Ultrathin Polyimine Nanofilms Formed at the Liquid–Liquid Interface Used for Molecular Separation

et al. 2020

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Separation membranes with higher molecular weight cut‐offs are needed to separate ions and small molecules from a mixed feed. The molecular sieving phenomenon can be utilized to separate smaller species with well‐defined dimensions from a mixture. Here, the formation of freestanding polyimine nanofilms with thicknesses down to ≈14 nm synthesized via self‐assembly of pre‐synthesized imine oligomers is reported. Nanofilms are fabricated at the water–xylene interface followed by reversible condensation of polymerization according to the Pieranski theory. Polyimine nanofilm composite membranes are made via transferring the freestanding nanofilm onto ultrafiltration supports. High water permeance of 49.5 L m‐2 h−1 bar−1 is achieved with a complete rejection of brilliant blue‐R (BBR; molecular weight = 825 g mol−1) and no more than 10% rejection of monovalent and divalent salts. However, for a mixed feed of BBR dye and monovalent salt, the salt rejection is increased to ≈18%. Membranes are also capable of separating small dyes (e.g., methyl orange; MO; molecular weight = 327 g mol−1) from a mixed feed of BBR and MO. Considering a thickness of ≈14 nm and its separation efficiency, the present membrane has significance in separation processes.

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Section: Water Permeance and Molecular Separation Behavior Of The Polmentioning

confidence: 99%

Large Area Self‐Assembled Ultrathin Polyimine Nanofilms Formed at the Liquid–Liquid Interface Used for Molecular Separation

et al. 2020

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Simulation of Modified Nanoporous Titanate Composite Membrane in Reverse Osmosis Desalination Process

Deymi,

Pouranfard,

Emadzadeh

2024

Chem Eng & Technol

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Nowadays, due to the lack of drinking water and the increase in global demand, desalination by reverse osmosis (RO) has been developed. In this regard, activities have been carried out to increase water flux and salt removal, which are important indicators in this process, including membrane modification by loading nanoparticles (NPs). Process simulation plays an important role in reducing laboratory costs, improving efficiency, and investigating operational parameters in more detail. This is an important factor that leads us to process simulation. The simulation of the RO process by thin‐film composite membranes modified with nanoporous titanate (mNTs) NPs has been conducted using COMSOL software. The performance of this process was checked by loading different amounts of mNTs with the desired membrane. The results revealed that by adding 0.01 w % of mNTs to the membrane composition, the performance of the process was improved in that the initial water flux through the membrane increased by about 95.4 %, while the salt rejection remained nearby 98 % and did not decrease much. Finally, to validate and expand the simulation results, the model outcomes were compared with experimental data, and the mean relative error for water flux and salt removal percentage was 1.15 % and 0.83 %, respectively.

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Fouling of high pressure-driven NF and RO membranes in desalination processes: Mechanisms and implications on salt rejection

Mahlangu,

Nthunya,

Motsa

et al. 2023

Chemical Engineering Research and Design

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Prediction of salt rejection by nanofiltration and reverse osmosis membranes using Spiegler-Kedem model and an optimisation procedure

Cited by 6 publications

References 12 publications

Large Area Self‐Assembled Ultrathin Polyimine Nanofilms Formed at the Liquid–Liquid Interface Used for Molecular Separation

Large Area Self‐Assembled Ultrathin Polyimine Nanofilms Formed at the Liquid–Liquid Interface Used for Molecular Separation

Simulation of Modified Nanoporous Titanate Composite Membrane in Reverse Osmosis Desalination Process

Fouling of high pressure-driven NF and RO membranes in desalination processes: Mechanisms and implications on salt rejection

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