Preparation of Porous Polymeric Membranes Based on a Pyridine Containing Aromatic Polyether Sulfone

Koromilas, Nikos D.; Anastasopoulos, Charalampos; Oikonomou, Evdokia K.; Kallitsis, Joannis K.

doi:10.3390/polym11010059

Cited by 41 publications

(17 citation statements)

References 41 publications

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“…At first, as shown in Scheme 2 —route a, a “post-polymerization” complexation approach was selected. In this, the diphenyl pyridine moieties of the homopolymer ( pySO 2 ) [ 48 ], prepared from 2,6-dihydroxyphenylpyridine ( HOpy ) [ 47 ] and difluorophenylsulfone ( diFSO 2 ), were complexated with the terpyridine-Ir monocomplexes with dodecyloxy or methyl side groups, C 12 Otpy-IrCl 3 and CH 3 tpy-IrCl 3 , respectively. Various percentages of complexation were investigated to transfer the photophysical properties of the monomeric complexes to the copolymeric metallocomplexes.…”

Section: Resultsmentioning

confidence: 99%

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Bis-Tridendate Ir(III) Polymer-Metallocomplexes: Hybrid, Main-Chain Polymer Phosphors for Orange–Red Light Emission

et al. 2020

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In this work, hybrid polymeric bis-tridentate iridium(III) complexes bearing derivatives of terpyridine (tpy) and 2,6-di(phenyl) pyridine as ligands were successfully synthesized and evaluated as red-light emitters. At first, the synthesis of small molecular bis-tridendate Ir(III) complexes bearing alkoxy-, methyl-, or hydroxy-functionalized terpyridines and a dihydroxyphenyl-pyridine moiety was accomplished. Molecular complexes bearing two polymerizable end-hydroxyl groups and methyl- or alkoxy-decorated terpyridines were copolymerized with difluorodiphenyl-sulphone under high temperature polyetherification conditions. Alternatively, the post-polymerization complexation of the terpyridine-iridium(III) monocomplexes onto the biphenyl-pyridine main chain homopolymer was explored. Both cases afforded solution-processable metallocomplex-polymers possessing the advantages of phosphorescent emitters in addition to high molecular weights and excellent film-forming ability via solution casting. The structural, optical, and electrochemical properties of the monomeric and polymeric heteroleptic iridium complexes were thoroughly investigated. The polymeric metallocomplexes were found to emit in the orange–red region (550–600 nm) with appropriate HOMO and LUMO levels to be used in conjunction with blue-emitting hosts. By varying the metal loading on the polymeric backbone, the emitter’s specific emission maxima could be successfully tuned.

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Section: Resultsmentioning

confidence: 99%

“…4(Phenyl-4-hydroxy) terpyridine ( HOtpy ) [ 46 ], 4 (phenyl-4-dodecyloxy) terpyridine ( C 12 Otpy ) [ 46 ], 2,6-Bis(4-hydroxyphenyl)pyridine ( HOpy ) [ 47 ], and the homopolymer ( pySO 2 ) [ 48 ] were prepared according to literature procedures. Bis(4-fluorophenyl)sulfone ( diFSO 2 ) was purchased from Chemos GmbH (Altdorf, Germany).…”

Section: Methodsmentioning

confidence: 99%

Bis-Tridendate Ir(III) Polymer-Metallocomplexes: Hybrid, Main-Chain Polymer Phosphors for Orange–Red Light Emission

et al. 2020

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“…The porosity of the substrate was determined using dry-wet weight technique. 41 The porosity (%) was measured as a function of the weight of membrane.…”

Section: Evaluation Of Performance Of Substrate and Tfc/tfn Membranesmentioning

confidence: 99%

Facile purification of palygorskite and its effect on the performance of reverse osmosis thin film nanocomposite membrane

Mamah

Goh

Ismail

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Palygorskite (PAL) is a naturally occurring nanoclay characterized by a distinctive tubular structure and fibrous morphology, exhibiting chemical and thermal stability as well as large specific surface area. The tubular structure of PAL promotes the selective transportation of water molecules, hence can serve as an interesting candidate for liquid separation. In this work, a membrane substrate was fabricated using the purified PAL to enhance the flux of the thin film composite reverse osmosis. Purification of PAL enhances its interaction with polymer chain to further promote nanofiller dispersion and improves the hydrophilic properties. The water flux as well as salt rejection of the developed membranes was examined using a dead end filtration system. The membrane performance with respect to pure water flux and salt rejection was evaluated using reverse osmosis water and 2000 ppm sodium chloride solution at 15 bar operation pressure. RESULTS:The physico-chemical characterization evidenced the role of purified PAL (P-PAL) in increasing the number of pores and promoting the formation of finger like structure in the substrate layer. The water flux of thin film nanocomposite (TFN) containing P-PAL exhibited 114.6% and 43.1% improvement compared to that of neat and TFN membrane incorporated with pristine PAL respectively without compromising the salt rejection performance.CONCLUSIONS: This study highlights the purification of palygorskite and its effects on membrane water permeability in the field of water desalination.

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“…There is no economic justification for the former method, especially as the concentration of natural organic matter in raw water increases, whereas regarding the latter – advanced oxidation processes – the main challenge is the possibility of forming undesirable byproducts that represent an increase in antagonistic effects such as toxicity and estrogenic activity 2,3 . Yet, one set of established and mature technologies that has demonstrated sustainability and pollution control attributes in a variety of environmental, biological and food processing applications involves the exploitation of membrane technology; most notably pressure‐driven, polymeric membrane processes, due to the low cost of production and ease of operation, seem to be a good solution for overcoming this global challenge 9–12 . One exceptional feature of membranes that has enhanced their potential to replace conventional treatment processes is that they can be used in independent processes or be a part of integrated/hybrid systems with other conventional separation technologies such as coagulation or sorption on active carbon and membrane bioreactors 4,13–19 …”

Section: Introductionmentioning

confidence: 99%

A comprehensive analysis of membrane fouling in microfiltration of complex linear macromolecules based on theoretical modeling and FESEM images

Heidari

Etemadi

Yegani

2020

J of Chemical Tech & Biotech

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BACKGROUNDMembrane technology is an attractive alternative to conventional water/wastewater treatment technologies as it is sustainable and can be used as an independent process as well as being a part of integrated systems with other treatment technologies. Notwithstanding the abundant benefits that membrane‐based systems offer, their commercial application is overshadowed by the ubiquitous fouling. However, accurate prediction and identification of membrane fouling mechanisms can help to open new doors in recognition of appropriate arrangements for developing more effective membrane synthesis methods and fundamental strategies to achieve better performance, especially in large‐scale production.RESULTSIn this study, three fouling models, namely resistance‐in‐series (RIS), Hermia's and combined cake filtration–pore blockage models, were applied to precisely analyze fouling behavior in dead‐end microfiltration (MF) of collagen solution, as model foulant, using pure high‐density polyethylene and modified high‐density polyethylene membranes. The RIS model was shown to be not representative of the real fouling mechanism in MF membrane units. Similarly, none of the classical models were able to accurately predict fouling in the entire MF process. However, the combined cake–intermediate blockage model provided excellent fits for the membranes.CONCLUSIONSObtained results also demonstrated that physical cleaning was not enough for organic fouling elimination in MF processes. Finally, computational results were validated with experimental observations of collagen rejection and field emission scanning electron microscopy analyses as well. © 2020 Society of Chemical Industry

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Preparation of Porous Polymeric Membranes Based on a Pyridine Containing Aromatic Polyether Sulfone

Cited by 41 publications

References 41 publications

Bis-Tridendate Ir(III) Polymer-Metallocomplexes: Hybrid, Main-Chain Polymer Phosphors for Orange–Red Light Emission

Bis-Tridendate Ir(III) Polymer-Metallocomplexes: Hybrid, Main-Chain Polymer Phosphors for Orange–Red Light Emission

Facile purification of palygorskite and its effect on the performance of reverse osmosis thin film nanocomposite membrane

A comprehensive analysis of membrane fouling in microfiltration of complex linear macromolecules based on theoretical modeling and FESEM images

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