Effects of carboxylated multi-walled carbon nanotubes having different outer diameters on hollow fiber ultrafiltration membrane fabrication and characterization by electrochemical impedance spectroscopy

Ates‐Genceli, Esra; Şengür-Taşdemir, Reyhan; Urper, Gulsum Melike; Gümrükçü, Selin; Guler, Zeliha; Dagli, Ugur; Türken, Türker; Sarac, A. Sezai̇; Koyuncu, İsmail

doi:10.1007/s00289-017-2155-3

Cited by 10 publications

(2 citation statements)

References 44 publications

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“…High dope solution viscosity has been observed to slow the exchange of solvent and non-solvent during the phase-inversion process, resulting in smaller surface pores [ 33 ]. Larger macro voids also can be reduced by increasing the viscosity of the fluid [ 63 ].…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of PVDF–TiO2 Mixed-Matrix Membrane with PVP and PEG as Pore-Forming Agents for BSA Rejection

et al. 2023

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Polymeric membranes offer straightforward modification methods that make industry scaling affordable and easy; however, these materials are hydrophobic, prone to fouling, and vulnerable to extreme operating conditions. Various attempts were made in this study to fix the challenges in using polymeric membranes and create mixed-matrix membrane (MMMs) with improved properties and hydrophilicity by adding titanium dioxide (TiO2) and pore-forming agents to hydrophobic polyvinylidene fluoride (PVDF). The PVDF mixed-matrix ultrafiltration membranes in this study were made using the non-solvent phase inversion approach which is a simple and effective method for increasing the hydrophilic nature of membranes. Polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG) as pore-forming chemicals were created. Pure water flux, BSA flux, and BSA rejection were calculated to evaluate the mixed-matrix membrane’s efficiency. Bovine serum albumin (BSA) solution was employed in this study to examine the protein rejection ability. Increases in hydrophilicity, viscosity, and flux in pure water and BSA solution were achieved using PVP and PEG additives. The PVDF membrane’s hydrophilicity was raised with the addition of TiO2, showing an increased contact angle to 71°. The results show that the PVDF–PVP–TiO2 membrane achieved its optimum water flux of 97 L/(m2h) while the PVDF–PEG–TiO2 membrane rejected BSA at a rate greater than 97%. The findings demonstrate that use of a support or additive improved filtration performance compared to a pristine polymeric membrane by increasing its hydrophilicity.

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Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of PVDF–TiO2 Mixed-Matrix Membrane with PVP and PEG as Pore-Forming Agents for BSA Rejection

et al. 2023

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“…Several recent investigations have considered the addition of nanomaterials as "nanofillers" in the polymer matrix to increase the antifouling resistance of membranes, primarily through alterations in surface charge and hydrophobicity of membrane in surfaces water treatment applications. [6][7][8][9][10] Inorganic particles such as graphene oxides, [11,12] carbon nanotubes (CNTs), [3,13,14] silica (SiO 2 ), [15,16] and titanium dioxide (TiO 2 ), [14,17,18] when added to the PA layer of thin-film composites, have been observed to improve hydrophilicity and reduce fouling. TiO 2 is one such promising nanofiller that may be used to improve properties of both the rejecting skin and support layers of membranes due to its relatively high hydrophilicity, [19,20] low toxicity, and environmental compatibility.…”

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Comparative impact of SiO₂ and TiO₂ nanofillers on the performance of thin‐film nanocomposite membranes

Urper-Bayram

Bossa

Warsinger

et al. 2020

J of Applied Polymer Sci

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Nanoparticle (NP) additions can substantially improve the performance of reverse osmosis and nanofiltration polyamide (PA) membranes. However, the relative impacts of leading additives are poorly understood. In this study, we compare the effects of TiO2 and SiO2 NPs as nanofillers in PA membranes with respect to permeate flux and the rejection of organic matter (OM) and salts. Thin‐film nanocomposite (TFN) PA membranes were fabricated using similarly sized TiO2 15 nm and SiO2 (10 – 20 nm) NPs, introduced at four different NP concentrations (0.01, 0.05, 0.2, and 0.5% w/v). Compared with PA membranes fabricated without NPs, membranes fabricated with nanofillers improved membranes hydrophilicity, membrane porosity, and consequently the permeability. Permeability was increased by 24 and 58% with the addition of TiO2 and SiO2, respectively. Rejection performance and fouling behavior of the membranes were examined with salt (MgSO4 and NaCl) and OM (humic acid [HA] and tannic acid [TA]). The addition of TiO2 and SiO2 nanofillers to the PA membranes improved the permeability of these membranes and also increased the rejection of MgSO4, especially for TiO2 membranes. The addition of TiO2 and SiO2 to the membranes exhibited a higher flux and lower flux decline ratio than the control membrane in OM solution filtration. TFN membranes' HA and TA rejections were at least 77 and 71%, respectively. The surface change properties of NPs appear to play a dominant role in determining their effects as nanofillers in the composite membrane matrix through a balance of changes produced in membrane pore size and membrane hydrophilicity.

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Effect of operating pressure and pyrolysis conditions on the performance of carbon membranes for CO2/CH4 and O2/N2 separation derived from polybenzimidazole/Matrimid and UIP-S precursor blends

Behnia

Pirouzfar

2018

Polym. Bull.

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Effects of carboxylated multi-walled carbon nanotubes having different outer diameters on hollow fiber ultrafiltration membrane fabrication and characterization by electrochemical impedance spectroscopy

Cited by 10 publications

References 44 publications

Preparation and Characterization of PVDF–TiO2 Mixed-Matrix Membrane with PVP and PEG as Pore-Forming Agents for BSA Rejection

Preparation and Characterization of PVDF–TiO2 Mixed-Matrix Membrane with PVP and PEG as Pore-Forming Agents for BSA Rejection

Comparative impact of SiO₂ and TiO₂ nanofillers on the performance of thin‐film nanocomposite membranes

Effect of operating pressure and pyrolysis conditions on the performance of carbon membranes for CO2/CH4 and O2/N2 separation derived from polybenzimidazole/Matrimid and UIP-S precursor blends

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Effects of carboxylated multi-walled carbon nanotubes having different outer diameters on hollow fiber ultrafiltration membrane fabrication and characterization by electrochemical impedance spectroscopy

Cited by 10 publications

References 44 publications

Preparation and Characterization of PVDF–TiO2 Mixed-Matrix Membrane with PVP and PEG as Pore-Forming Agents for BSA Rejection

Preparation and Characterization of PVDF–TiO2 Mixed-Matrix Membrane with PVP and PEG as Pore-Forming Agents for BSA Rejection

Comparative impact of SiO2 and TiO2 nanofillers on the performance of thin‐film nanocomposite membranes

Effect of operating pressure and pyrolysis conditions on the performance of carbon membranes for CO2/CH4 and O2/N2 separation derived from polybenzimidazole/Matrimid and UIP-S precursor blends

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Comparative impact of SiO₂ and TiO₂ nanofillers on the performance of thin‐film nanocomposite membranes