Performance enhancement in organic solvent nanofiltration by double crosslinking technique using sulfonated polyphenylsulfone (sPPSU) and polybenzimidazole (PBI)

Tashvigh, Akbar Asadi; Luo, Lin; Chung, Tai‐Shung; Weber, Martin; Maletzko, Christian

doi:10.1016/j.memsci.2018.01.047

Cited by 76 publications

(28 citation statements)

References 52 publications

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“…The desalination performance of PBI HF was sensitive to pH of the feed solution because the N-H functional groups in the imidazole ring have a lone pair on the nitrogen that acts as a proton acceptor. In an aqueous solution, the PBI membrane surface tends to be positively charged [5,31], and its rejection of salt is enhanced because it repels cations in the solution due to the Donnan exclusion effect. As is shown in Figure 9, the PBI HF rejects NaCl above 95% when the pH value is lower than 7.…”

Section: Resultsmentioning

confidence: 99%

“…Polybenzimidazole (PBI) is an attractive candidate for hollow-fiber (HF) membrane separation because of its extremely high continuous operating temperature (as high as 250 °C) [1], robust mechanical stability [2], and outstanding chemical resistance [3,4,5]. At present, spiral-wound modules based on flat-sheet membranes have dominated the market for large desalination plants, with Toyobo providing HF modules derived from cellulose triacetate (CTA) [6].…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Polybenzimidazole Hollow-Fiber Membranes for Reverse Osmosis and Nanofiltration by Changing the Spinning Air Gap

et al. 2018

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High-performance polybenzimidazole (PBI) hollow-fiber membranes (HFMs) were fabricated through a continuous dry-jet wet spinning process at SRI International. By adjusting the spinning air gap from 4″ (10.2 cm) to 0.5″ (1.3 cm), the HFM pore sizes were enlarged dramatically without any significant change of the fiber dimensional size and barrier layer thickness. When fabricated with an air gap of 2.5″ (6.4 cm) and a surface modified by NaClO solution, the PBI HFM performance was comparable to that of a commercial reverse osmosis (RO) HFM product from Toyobo in terms of salt (NaCl) rejection and water permeability. The PBI RO HFM was positively surface charged in acidic conditions (pH < 7), which enhanced salt rejection via the Donnan effect. With an air gap of 1.5″ (3.8 cm), the PBI HFM rejected MgSO4 and Na2SO4 above 95%, a result that compares favorably with that achieved by nanofiltration. In addition, the PBI HFM has a defect-free structure with an ultra-thin barrier layer and porous sublayer. We believe PBI HFMs are ideal for water purification and can be readily commercialized.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of Polybenzimidazole Hollow-Fiber Membranes for Reverse Osmosis and Nanofiltration by Changing the Spinning Air Gap

et al. 2018

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“…111,166 An ionically bonded composite structure was prepared using PBI cross-linked by DBX and hyperbranched PEI (HPEI) cross-linked sulfonated polyphenylsulfone (sPPSU), which exhibited solvent permeance of 2-12 LMH/bar and a rejection of 67-97% for tetracycline (444 g/mol). 113 PBI-DBX surface was further cross-linked using HPEI, leading to a selective layer of 47 nm with ethanol permeance of 4.5 LMH/bar and complete rejection of tetracycline. 33 PBI can be functionalized before cross-linking.…”

Section: Post-cross-linked Polymersmentioning

confidence: 99%

Designing organic solvent separation membranes: polymers, porous structures, 2D materials, and their combinations

et al. 2021

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“…NF membranes show lower rejection ability against monovalent metal ions than the multivalent ones. NF also has some advantages, such as low maintenance and operation cost, high rejection against multivalent metal ions, high flux, and low operational pressure [12,13,14,15,16]. Most NF membranes are composite membranes consisting of a porous substrate and a top-separating layer.…”

Section: Introductionmentioning

confidence: 99%

Effect of Chemical Structure on the Performance of Sulfonated Poly(aryl ether sulfone) Composite Nanofiltration Membranes

et al. 2019

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This paper discusses the effect of the chemical structure of sulfonated poly(aryl ether sulfone) on the performance of composite nanofiltration membranes. The composite nanofiltration membranes were fabricated by coating sulfonated poly(aryl ether sulfone) solution onto the top surface of poly(phthalazinone ether sulfone ketone) support membranes. Three kinds of sulfonated poly(aryl ether sulfone)s with different amounts of phthalazinone moieties, namely, sulfonated poly(phthalazinone ether sulfone) (SPPES), sulfonated poly(phthalazinone biphenyl ether sulfone) (SPPBES), and sulfonated poly(phthalazinone hydroquinone ether sulfone)s (SPPHES), were used as coating materials. The solvents used in preparing the coating solution were investigated and optimized. The separation properties, thermal stability, and chlorine resistance of composite membranes were determined. The structures and morphologies of membranes were characterized with FTIR and SEM, respectively. The membrane prepared from SPPES with more phthalazinone moiety groups showed high water flux and salt rejection. The salt rejection of composite membranes followed the order SPPES > SPPHES > SPPBES. The rejection of the three composite membranes decreased slightly with the solution temperature rising from 20 to 90 °C, while the composite membrane with SPPES as the active layer showed a higher increase in flux than others. The results indicate that SPPES composite membranes show better thermal stability than others.

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Performance enhancement in organic solvent nanofiltration by double crosslinking technique using sulfonated polyphenylsulfone (sPPSU) and polybenzimidazole (PBI)

Cited by 76 publications

References 52 publications

Preparation of Polybenzimidazole Hollow-Fiber Membranes for Reverse Osmosis and Nanofiltration by Changing the Spinning Air Gap

Preparation of Polybenzimidazole Hollow-Fiber Membranes for Reverse Osmosis and Nanofiltration by Changing the Spinning Air Gap

Designing organic solvent separation membranes: polymers, porous structures, 2D materials, and their combinations

Effect of Chemical Structure on the Performance of Sulfonated Poly(aryl ether sulfone) Composite Nanofiltration Membranes

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