Scaling-up of robust nanofiltration membrane of ultrathin-film-composite structure

Thummar, Utpal G.; Koradiya, Ashray; Saxena, Mayank; Polisetti, Veerababu; Ray, Paramita; Singh, Puyam S.

doi:10.1016/j.desal.2022.115650

Cited by 13 publications

(5 citation statements)

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“…During the measurement of thickness, the prepared membranes were immersed into DMF to dissolve the PES support layer. Then the separation layer was exfoliated away from the nonwoven fabric and transferred to a silicon wafer for testing . A confocal laser scanning microscope (CLSM, Leica SP8-STED 3X, Germany) was employed to visualize the BSA distribution in the fouling layer on the membrane, and the FITC-labeled BSA was synthesized according to the method published previously. , …”

Section: Methodsmentioning

confidence: 99%

Enhancing the Antifouling Ability of a Polyamide Nanofiltration Membrane by Narrowing the Pore Size Distribution via One-Step Multiple Interfacial Polymerization

Liu

Chen

Feng

et al. 2022

ACS Appl. Mater. Interfaces

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Application of nanofiltration membranes in industries still has to contend with membrane fouling that causes a significant loss of separation performance. Herein, an innovative approach to design antifouling membranes with a narrowed pore size distribution by interfacial polymerization (IP) assisted by silane coupling agents is reported. An aqueous solution of piperazine anhydrous (PIP) and γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560) is employed to perform IP with an organic solution of trimesoyl chloride and tetraethyl orthosilicate (TEOS) on a porous support. In accordance with the results of molecular dynamics and dissipative particle dynamics simulations, the reactive additive KH560 accelerates the diffusion rate of PIP to enrich at the reaction boundary. Moreover, the hydrolysis/condensation of KH560 and TEOS at the aqueous/organic interface forms an interpenetrating network with the polyamide network, which regulates the separation layer structure. The characterization results indicate that the polyamide–silica membrane has a denser, thicker, and uniform separation layer. The mean pore size of the polyamide–silica membrane and the traditional polyamide membrane is 0.62 and 0.74 nm, respectively, and these correspond to the geometric standard deviation (namely, pore size distribution) of 1.39 and 1.97, respectively. It is proved that the narrower pore size distribution endows the polyamide–silica membrane with stronger antifouling performance (flux decay ratio decreases from 18.4 to 3.8%). Such a membrane also has impressive long-term antifouling stability during cane molasses decolorization at a high temperature (50 °C). The outcomes of this study not only provide a novel one-step multiple IP strategy to prepare antifouling nanofiltration membranes but also emphasize the importance of pore size distribution in fouling control for various industrial liquid separations.

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Section: Methodsmentioning

confidence: 99%

Enhancing the Antifouling Ability of a Polyamide Nanofiltration Membrane by Narrowing the Pore Size Distribution via One-Step Multiple Interfacial Polymerization

Liu

Chen

Feng

et al. 2022

ACS Appl. Mater. Interfaces

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“…The casting chamber temperature was set to 25 C. A filler gage was used to maintain a uniform thickness of 100 μm between the casting blades and the rolling fabric. The polymer-coated fabric was then passed through a gelation bath containing water at 25 C, causing the polymer to solidify (Thummar et al, 2022). Following this, the membrane underwent multiple washes with ultra-pure water to remove any excess DMF, and this washing process continued in a deionized water tank.…”

Section: Preparation Of Psf Substratementioning

confidence: 99%

“…LSR membranes, like many others, can be produced using a multitude of approaches aimed at tailoring their performance during fabrication. These strategies encompass optimizing the interfacial polymerization process (Ghosh et al, 2008), incorporating additives such as nanoparticles (Chae et al, 2015;Wang et al, 2018), and investigating the influence of substrate (Thummar et al, 2022), monomers (Zhang et al, 2020), and surfactants (Thummar et al, 2023). In addition, the membranes prepared via conventional interfacial polymerization can subsequently be modified by treatment with acids (Shin et al, 2020), alcohols (Agrawal & Singh, 2012), or organic solvents (Hai et al, 2016;Li et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Multi‐dimensional parametric study for enhancing Brackish Water Reverse Osmosis membrane performance suited for desalination of low salinity feeds

Thummar,

Amaliar,

Sutariya

et al. 2024

Water Environment Research

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Reverse osmosis (RO) effectively provides clean drinking water. Different RO membrane types are tailored to treat saline water feeds with varying characteristics. In the context of low brackish water feeds, the objective is to remove only a minimal excess of salinity through the membrane. Our study introduces a method of membrane post‐treatments capable of achieving controlled salt rejection while concurrently enhancing permeate flux, which is vital for achieving effective and energy‐efficient desalination of low brackish water. The post‐treatments were conducted on our in‐house‐developed membranes using aqueous solutions of N,N‐Dimethylformamide and glycerol for different drying times at the coupon level. The process was scaled up at the module level, allowing us to assess its potential for commercial application. At the coupon level, the permeate flux increased significantly from 3.7 ± 0.9 to 10.6 ± 0.2 L/m2·h·bar, while the salt rejection decreased from 95.6 ± 1% to 70.5 ± 1% when measured with a feed of 2,000 ppm NaCl concentration. At the module level, we observed a higher flux of 12.8 L/m2·h·bar, alongside a salt rejection of 55.5% with a similar feed. Varying post‐treatment parameters at the coupon level allowed us to attain the desired salt rejection and permeate flux values. Physical changes in both pristine and post‐treated membranes, including polymer swelling, were observed without chemical alterations, enhancing our understanding of the post‐treatment effect and its potential for broader commercial use.Practitioner Points Post‐treatment of RO membranes enhances flux. Physical structuring through polymer swelling was observed with the chemical structure unaltered. Post‐treatment of RO opens doors for broader energy‐efficient desalination application.

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“…These nanomaterials have been useful in engineering separation membranes with enhanced properties [ 18 , 19 , 20 , 21 ]. The improvement of polymeric membranes by using nanomaterials occurs due to the formation of continuous, straight transport channels.…”

Section: Factors Affecting the Performance Of Polymeric Membranesmentioning

confidence: 99%

“…These facts rendered the membrane surface hydrophilic with a lower contact angle and imparted a negative zeta potential that increased with an increase in the pH. This membrane with a narrow pore size distribution (median pore radius of 0.26 nm) had an outstanding water flow of 158 L M −2 H −1 at 50 pressure and a strong rejection (>99%) of bivalent salt (Na 2 SO 4 ) [ 20 ].…”

Section: Development and Production Of Nano-based Polymeric Membranesmentioning

confidence: 99%

Nanoparticle-Embedded Polymers and Their Applications: A Review

Khdary,

Almuarqab,

El Enany

2023

Membranes

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There has been increasing interest in the study and development of nanoparticle-embedded polymeric materials and their applications to special membranes. Nanoparticle-embedded polymeric materials have been observed to have a desirable compatibility with commonly used membrane matrices, a wide range of functionalities, and tunable physicochemical properties. The development of nanoparticle-embedded polymeric materials has shown great potential to overcome the longstanding challenges faced by the membrane separation industry. One major challenge that has been a bottleneck to the progress and use of membranes is the balance between the selectivity and the permeability of the membranes. Recent developments in the fabrication of nanoparticle-embedded polymeric materials have focused on how to further tune the properties of the nanoparticles and membranes to improve the performance of the membranes even further. Techniques for improving the performance of nanoparticle-embedded membranes by exploiting their surface characteristics and internal pore and channel structures to a significant degree have been incorporated into the fabrication processes. Several fabrication techniques are discussed in this paper and used to produce both mixed-matrix membranes and homogenous nanoparticle-embedded polymeric materials. The discussed fabrication techniques include interfacial polymerization, self-assembly, surface coating, and phase inversion. With the current interest shown in the field of nanoparticle-embedded polymeric materials, it is expected that better-performing membranes will be developed soon.

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Scaling-up of robust nanofiltration membrane of ultrathin-film-composite structure

Cited by 13 publications

References 50 publications

Enhancing the Antifouling Ability of a Polyamide Nanofiltration Membrane by Narrowing the Pore Size Distribution via One-Step Multiple Interfacial Polymerization

Enhancing the Antifouling Ability of a Polyamide Nanofiltration Membrane by Narrowing the Pore Size Distribution via One-Step Multiple Interfacial Polymerization

Multi‐dimensional parametric study for enhancing Brackish Water Reverse Osmosis membrane performance suited for desalination of low salinity feeds

Nanoparticle-Embedded Polymers and Their Applications: A Review

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