Chemical modification of polysulfone: Composite anionic exchange membrane with TiO2 nano-particles

Nonjola, Patrick; Mathe, Mkhulu; Modibedi, Remegia M.

doi:10.1016/j.ijhydene.2013.02.028

Cited by 61 publications

(43 citation statements)

References 42 publications

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“…S1, Supporting Information) to confirm in situ quaternization of PSf-CH 2 Cl with TMA. The characteristic absorption bands at 3396, 1665 and 1485 cm -1 are observed due to -CH 2 N(CH 3 ) 3 + groups in QPSf and the obtained results confirm in situ quaternization of PSf-CH 2 Cl with TMA 25,31,34. …”

supporting

confidence: 71%

“…34 The typical procedure for synthesis of PSf-CH 2 Cl was as follows: 5 g PSf was dissolved in 250 ml CHCl 3 (AR grade, stored in presence of 4A o molecular sieves) in a round bottom flask equipped with a reflux condenser and magnetic stirrer. After dissolution of PSf, 3.5 g (115 mmol) of paraformaldehyde and 12.5 g (115 mmol) of (CH 3 ) 3 SiCl were alternatively added.…”

Section: Synthesis Of Quaternized Polysulfonementioning

confidence: 99%

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Quaternized polysulfone and graphene oxide nanosheet derived low fouling novel positively charged hybrid ultrafiltration membranes for protein separation

et al. 2015

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Low fouling novel positively charged hybrid ultrafiltration membranes with adjustable charge density were fabricated from blends of polysulfone (PSf) and quaternized polysulfone (QPSf) in combination with varied fractions of graphene oxide (GO) nanosheets by a non-solvent induced phase separation method. Fourier transform infrared spectroscopy in the attenuated total reflection mode, scanning electron microscopy, outer surface zeta potential and contact angle studies were conducted to characterize the morphologies of hybrid membranes, structures, charge and surface properties. Results confirmed the fabrication of porous, hydrophilic and positively charged membranes. The water permeabilities (flux) andantifouling ability of membranes with protein solution were dependent on the fraction of quaternary ammonium groups and GO nanosheets in the membranes matrix. Antifouling ability of membranes was improved after the incorporation of GO nanosheets. In addition, 2 irreversible protein fouling of membranes was substantially decreased with increasing fraction of GO nanosheets (%). The transmission of protein as a function of solution pH and the fraction of GO nanosheets (%) in the membranes was studied for two model proteins (bovine serum albumin; BSA or lysozyme; LYZ). The transmission of BSA or LYZ was controlled by size exclusion and the fraction of GO nanosheets in the membranes matrix. The highest transmission of proteins at their isoelectric points was obtained for membrane containing 2 wt% of GO nanosheets to total weight of polymers.

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supporting

confidence: 71%

Section: Synthesis Of Quaternized Polysulfonementioning

confidence: 99%

Quaternized polysulfone and graphene oxide nanosheet derived low fouling novel positively charged hybrid ultrafiltration membranes for protein separation

et al. 2015

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“…So, developing hybrid membranes seems to be a simple and effective method for the advancement of AEMs. Hybrid membranes with inorganic fillers such as SiO 2 , TiO 2 , ZrO 2 , graphene , bentotite , montmorillonite have been reported by researchers worldwide with significant improvements in the physico‐chemical properties and their performances . Recent studies have shown that the functionalized fillers, in addition to the ion exchange groups present in membrane, participate in the ion exchange process and improve the conductivity considerably .…”

Section: Introductionmentioning

confidence: 99%

Octa‐imidazolium POSS/quaternized polysulfone composite anion exchange membrane for alkaline fuel cell

Elumalai

Dharmalingam

2018

Polymer Composites

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In the present study, a series of new anion exchange composite membranes were fabricated from pre‐synthesized imidazolium grafted polyhedral oligomeric silsesquioxane (IM‐POSS) with quaternary polysulfone (QPSU). Synthesized IM‐POSS were acutely characterized by Fourier‐transform infrared, NMR, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) investigations to confirm the chemical structure and cubic morphologies. The IM‐POSS nanoparticles have binary function in the anion exchange membrane by providing more additional ion conducting groups (imidazolium) and by reinforcing the membrane in molecular level for overall improvement of composite membranes. The prepared composite membranes with various compositions of the IM‐POSS/QPSU were characterized by X‐ray diffraction, SEM, ion exchange capacity, water uptake (Wup), and conductivity to assure the appropriateness of their use as a solid alkaline electrolyte in anion exchange membrane fuel cell. The membrane electrode assembly was constructed using Pt anode (0.25 mg/cm2), Ag cathode (0.375 mg/cm2), and various IM‐POSS/QPSU composite membranes, which was tested in an in‐house built fuel cell setup. The membrane with 15% IM‐POSS showed the maximum power density of 309 mW/cm2. The results showed that the addition of IM‐POSS is a straight forward and effectual method to enhance the hydroxide conductivity without sacrificing other properties of the membrane. POLYM. COMPOS., 40:1536–1544, 2019. © 2018 Society of Plastics Engineers

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“…AEMs suffer from rather low thermal, mechanical, and chemical stabilities . While a method to eliminate these drawbacks is to add inorganic materials into the polymeric matrices, incorporating nanosize inorganic particles can improve the desire properties more than what is achieved by adding mircosize ones owing to the higher specific surfaces of the nanoparticles . The higher surface area of hydrophilic nanoparticles prevents from recrystallization of polymeric chains, increases the membrane's amorphous phase, and reduces the glass temperature of polymeric matrix, T g .…”

Section: Introductionmentioning

confidence: 99%

“…The higher surface area of hydrophilic nanoparticles prevents from recrystallization of polymeric chains, increases the membrane's amorphous phase, and reduces the glass temperature of polymeric matrix, T g . Therefore, it also increases the ionic conductivity of the membrane …”

Section: Introductionmentioning

confidence: 99%

Incorporating functionalized silica nanoparticles in polyethersulfone‐based anion exchange nanocomposite membranes

Moghadasi

Mortaheb

2016

J of Applied Polymer Sci

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In order to investigate for anion exchange membranes (AEMs) with improved properties, four series of polyethersulfone‐based composite AEMs are fabricated by incorporating pristine and three functionalized silica nanoparticles containing propylamine, trimethylpropylamine, and melamine‐based dendrimer amine groups. The results show that by choosing appropriate functional agent, anion exchange membranes with improved parameters can be achieved. The polymeric matrix of the membranes is synthesized by chloromethylation of polyethersulfone using thionyl chloride followed by amination with trimethylamine (TMA). The effectiveness of chloromethylation process is confirmed by 1H NMR analysis. The effects of functional groups on characteristic and transport properties of the prepared composite membranes i.e., SEM, IEC, water uptake, porosity transport properties, and conductivity are investigated. The scanning electron microscope images illustrates that the synthesized membranes possess dense structures. Ion exchange capacity (IEC), water uptake, transport properties, and conductivity of the composite membranes are measured. In addition, the morphology and thermal stability are characterized. IECs and ion conductivities of up to 1.45 meq g−1 and 45.46 mS cm−1 and moderate transport characteristics are obtained from the modified membranes which confirm that these membranes are appropriate for applying in electro‐membrane processes. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44596.

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Chemical modification of polysulfone: Composite anionic exchange membrane with TiO2 nano-particles

Cited by 61 publications

References 42 publications

Quaternized polysulfone and graphene oxide nanosheet derived low fouling novel positively charged hybrid ultrafiltration membranes for protein separation

Quaternized polysulfone and graphene oxide nanosheet derived low fouling novel positively charged hybrid ultrafiltration membranes for protein separation

Octa‐imidazolium POSS/quaternized polysulfone composite anion exchange membrane for alkaline fuel cell

Incorporating functionalized silica nanoparticles in polyethersulfone‐based anion exchange nanocomposite membranes

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