Preparation of high performance TFC RO membranes by surface grafting of small-molecule zwitterions

Shan, Xinyao; Li, Shao-Lu; Fu, Wenming; Hu, Yemin; Gong, Genghao; Hu, Yunxia

doi:10.1016/j.memsci.2020.118209

Cited by 55 publications

(14 citation statements)

References 52 publications

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“…In addition, the normalized permeability and antifouling property of the TFC-10 membrane in this work are compared with those reported in the literature, as illustrated by the values of the relevant indicator, the normalized permeability in Figure D. ,− ,,,− The antifouling property and the filtration performance of the TFC-10 membrane are improved together by in situ surface chemical modification with zwitterionic copolymer brushes, which are among the best in the current literature. It further confirms the effectiveness of this strategy to break the trade-off between filtration performance and antifouling property of the TFC NF membranes.…”

Section: Resultsmentioning

confidence: 89%

“…In situ surface chemical modification is a facile and scalable technique in which the hydrophilic materials are in situ robustly grafted onto the nascent polyamide layer by reaction with surface acyl chloride groups in the process of membrane preparation. Hu et al 23 fabricated a polyamide RO membrane by in situ surface grafting of small-molecule zwitterions to enhance water permeability and fouling-resistance properties. An et al 24 reported surface zwitterionic polyamide NF membranes, and Chiao et al 25 fabricated a polyamide forward osmosis membrane with N-aminoethyl piperazine propane sulfonate (small-molecule zwitterion) through the in situ surface chemical modification technique.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In Situ Chemical Modification with Zwitterionic Copolymers of Nanofiltration Membranes: Cure for the Trade-Off between Filtration and Antifouling Performance

Zhang

Tian

et al. 2022

ACS Appl. Mater. Interfaces

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Breaking the trade-off between filtration performance and antifouling property is critical to enabling a thin-film nanocomposite (TFC) nanofiltration (NF) membrane for a wide range of feed streams. We proposed a novel design route for TFC NF membranes by grafting well-defined zwitterionic copolymers of [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (SBMA) and 2-aminoethyl methacrylate hydrochloride (AEMA) on the polyamide surfaces via an in situ surface chemical modification process. The successful grafting of a zwitterionic copolymer imparted the modified NF membranes with better surface hydrophilicity, a larger actual surface area (i.e., nodular structures), and a thinner polyamide layer. As a result, the water permeability of the modified membrane (i.e., TFC-10) was triple that of the pristine TFC membrane while maintaining high Na2SO4 rejection. We further demonstrated that the TFC-10 membrane possessed exceptional antifouling properties in both static adsorption tests and three cycles of dynamic protein and humic acid fouling tests. To recap, this work provides valuable insights and strategies for the fabrication of TFC NF membranes with simultaneously enhanced filtration performance and antifouling property.

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In Situ Chemical Modification with Zwitterionic Copolymers of Nanofiltration Membranes: Cure for the Trade-Off between Filtration and Antifouling Performance

Zhang

Tian

et al. 2022

ACS Appl. Mater. Interfaces

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“…Extensive experimental studies apply antifouling coating by graft polymerization [ 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 ]. The complication in these experiments is that one cannot precisely determine the density of the polymer chains.…”

Section: Resultsmentioning

confidence: 99%

Distinct Antifouling Mechanisms on Different Chain Densities of Zwitterionic Polymers

et al. 2022

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Antifouling polymer coating surfaces are used in widespread industries applications. Zwitterionic polymers have been identified as promising materials in developing polymer coating surfaces. Importantly, the density of the polymer chains is crucial for acquiring superior antifouling performance. This study introduces two different zwitterionic polymer density surfaces by applying molecular modeling tools. To assess the antifouling performance, we mimic static adsorption test, by placing the foulant model bovine serum albumin (BSA) on the surfaces. Our findings show that not only the density of the polymer chain affect antifouling performance, but also the initial orientation of the BSA on the surface. Moreover, at a high-density surface, the foulant either detaches from the surface or anchor on the surface. At low-density surface, the foulant does not detach from the surface, but either penetrates or anchors on the surface. The anchoring and the penetrating mechanisms are elucidated by the electrostatic interactions between the foulant and the surface. While the positively charged ammonium groups of the polymer play major role in the interactions with the negatively charged amino acids of the BSA, in the penetrating mechanism the ammonium groups play minor role in the interactions with the contact with the foulant. The sulfonate groups of the polymer pull the foulant in the penetrating mechanism. Our work supports the design of a high-density polymer chain surface coating to prevent fouling phenomenon. Our study provides for the first-time insights into the molecular mechanism by probing the interactions between BSA and the zwitterion surface, while testing high- and low-densities polymer chains.

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“…Manufacturing membranes with lotus leaf structures can also increase hydrophobicity, feasible through a 3D printing approach. The water flux and salt rejection efficiency of a TFC membrane with a 3D printing deposited polyamide layer [42] were compared with those of conventional membranes using information collected from [46,47,[57][58][59][60][61][62][63][64][65][66][67][68][69][70]. Figure 8 shows the performance of these membranes.…”

Section: Properties and Performancementioning

confidence: 99%

3D Printed and Conventional Membranes—A Review

et al. 2022

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Polymer membranes are central to the proper operation of several processes used in a wide range of applications. The production of these membranes relies on processes such as phase inversion, stretching, track etching, sintering, or electrospinning. A novel and competitive strategy in membrane production is the use of additive manufacturing that enables the easier manufacture of tailored membranes. To achieve the future development of better membranes, it is necessary to compare this novel production process to that of more conventional techniques, and clarify the advantages and disadvantages. This review article compares a conventional method of manufacturing polymer membranes to additive manufacturing. A review of 3D printed membranes is also done to give researchers a reference guide. Membranes from these two approaches were compared in terms of cost, materials, structures, properties, performance. and environmental impact. Results show that very few membrane materials are used as 3D-printed membranes. Such membranes showed acceptable performance, better structures, and less environmental impact compared with those of conventional membranes.

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Preparation of high performance TFC RO membranes by surface grafting of small-molecule zwitterions

Cited by 55 publications

References 52 publications

In Situ Chemical Modification with Zwitterionic Copolymers of Nanofiltration Membranes: Cure for the Trade-Off between Filtration and Antifouling Performance

In Situ Chemical Modification with Zwitterionic Copolymers of Nanofiltration Membranes: Cure for the Trade-Off between Filtration and Antifouling Performance

Distinct Antifouling Mechanisms on Different Chain Densities of Zwitterionic Polymers

3D Printed and Conventional Membranes—A Review

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