Nanofiltration Module Design and Operation

Chong, Tzyy Haur; Fane, Anthony G.

doi:10.1002/9783527824984.ch3

Cited by 2 publications

(2 citation statements)

References 42 publications

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“…The rejection capacity of the NF270-Ppy-CNTs membrane is slightly higher than that of the NF270 commercial membrane, as shown in Figure 7. The findings of this study demonstrate that the introduction of CNTs into the commercial NF270 membrane yields a comparable behavior to that observed in tight NF membranes [40]. Specifically, the membrane rejection exhibited a consistent value that remained unaffected by the escalating water flux permeability.…”

Section: Filtration and Ion Rejection Performance Of Modified Membranessupporting

confidence: 61%

“…The relationship between the solute concentration at the surface and in the permeate can be expressed as [ 6 ]:

where

is defined as:

where

is the diffusion coefficient of the solute and

is the concentration polarization layer thickness. On the other hand, the mass transfer coefficient is related as follows:

where

is the radius of stirred cell and

is the Sherwood number [ 40 ]:

…”

Section: Methodsmentioning

confidence: 99%

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In-Situ Modification of Nanofiltration Membranes Using Carbon Nanotubes for Water Treatment

Vargas-Figueroa,

Pino-Soto,

Beratto-Ramos

et al. 2023

Membranes

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Modification of thin-film composite (TFC) nanofiltration (NF) membranes to increase permeability and improve separation performance remains a significant challenge for water scarcity. This study aimed to enhance the permeability and selectivity of two commercial polyamide (PA) NF membranes, NF90 and NF270, by modifying them with carbon nanotubes (CNTs) using microwave (MW)-assisted in-situ growth. The conducting polymer, polypyrrole (Ppy), and a ferrocene catalyst were used to facilitate the growth process. Chemical and morphological analyses confirmed that the surface of both membranes was modified. The NF270-Ppy-CNT membrane was selected for ion rejection testing due to its superior permeability compared to the NF90-Ppy-CNT. The modified NF270 membrane showed a 14% increase in ion rejection while maintaining constant water permeability. The results demonstrated that it is feasible to attach CNTs to a polymeric surface without compromising its functional properties. The Spliegler–Kedem model was employed to model the rejection and permeate flux of NF270-Ppy-CNT and NF270 membranes, which indicated that diffusive transport contributes to the modification to increase NaCl rejection. The present study provides a promising approach for modifying membranes by in-situ CNT growth to improve their performance in water treatment applications, such as desalination.

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Section: Filtration and Ion Rejection Performance Of Modified Membranessupporting

confidence: 61%

“…The relationship between the solute concentration at the surface and in the permeate can be expressed as [ 6 ]:

where

is defined as:

where

is the diffusion coefficient of the solute and

is the concentration polarization layer thickness. On the other hand, the mass transfer coefficient is related as follows:

where

is the radius of stirred cell and

is the Sherwood number [ 40 ]: