TY - JOUR
T1 - Effects of carboxylated multi-walled carbon nanotubes having different outer diameters on hollow fiber ultrafiltration membrane fabrication and characterization by electrochemical impedance spectroscopy
AU - Genceli, Esra A.
AU - Sengur-Tasdemir, Reyhan
AU - Urper, Gulsum Melike
AU - Gumrukcu, Selin
AU - Guler-Gokce, Zeliha
AU - Dagli, Ugur
AU - Turken, Turker
AU - Sarac, A. Sezai
AU - Koyuncu, Ismail
N1 - Publisher Copyright:
© 2017, Springer-Verlag GmbH Germany.
PY - 2018/6/1
Y1 - 2018/6/1
N2 - 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.
AB - 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.
KW - Electrochemical impedance spectroscopy
KW - Hollow fiber membrane
KW - Membrane characterization
KW - Multi-walled carbon nanotubes
UR - http://www.scopus.com/inward/record.url?scp=85027890187&partnerID=8YFLogxK
U2 - 10.1007/s00289-017-2155-3
DO - 10.1007/s00289-017-2155-3
M3 - Article
AN - SCOPUS:85027890187
SN - 0170-0839
VL - 75
SP - 2431
EP - 2457
JO - Polymer Bulletin
JF - Polymer Bulletin
IS - 6
ER -