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

Esra A. Genceli*, Reyhan Sengur-Tasdemir, Gulsum Melike Urper, Selin Gumrukcu, Zeliha Guler-Gokce, Ugur Dagli, Turker Turken, A. Sezai Sarac, Ismail Koyuncu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The effects of different outer diameters and concentrations of multi-walled carbon nanotubes on polysulfone (PS) hollow fiber membranes were investigated. Nanocomposite polymer solutions were formed by adding 0.01, 0.05, 0.2 and 0.5 wt% multi-walled-carbon nanotubes (MWCNT), having 20–30, 8–15 and <8 nm outer diameters, to PS. Subsequently, fabricated membranes were characterized according to their dope solution viscosity; surface morphology, hydrophilicity and charge; membrane permeability. The effects of MWCNT addition on membrane performance were determined by electrochemical impedance spectroscopy (EIS) as well as by reversible and irreversible fouling ratios. EIS data showed that double-layer capacitance (Cdl) values of membranes were increased as negative charge density on membranes was increased. Moreover, EIS measurements indicated a decrease in the Cdl dependent on the BSA filtration. This study demonstrated that EIS can be successfully used for hollow fiber membrane configuration. It also showed that EIS can be used for the surface characterization and membrane performance of hollow fiber nanocomposite membranes.

Original languageEnglish
Pages (from-to)2431-2457
Number of pages27
JournalPolymer Bulletin
Volume75
Issue number6
DOIs
Publication statusPublished - 1 Jun 2018

Bibliographical note

Publisher Copyright:
© 2017, Springer-Verlag GmbH Germany.

Funding

Acknowledgement The authors are grateful to TUBITAK (The Scientific and Technological Research Council of Turkey) for their financial support under grant (Project No: 113Y359).

FundersFunder number
TUBITAK
The Scientific and Technological Research Council of Turkey113Y359

    Keywords

    • Electrochemical impedance spectroscopy
    • Hollow fiber membrane
    • Membrane characterization
    • Multi-walled carbon nanotubes

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