Streaming potential measurements of polyethersulfone ultrafiltration membranes to determine salt effects on membrane zeta potential

SALGIN S., SALGIN U., SOYER N.

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE, cilt.8, sa.3, ss.4073-4084, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 8 Sayı: 3
  • Basım Tarihi: 2013
  • Dergi Adı: INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.4073-4084
  • Anahtar Kelimeler: Streaming potential, PES membrane, Zeta potential, Salt effects, Ionic strength, BOVINE SERUM-ALBUMIN, ELECTROKINETIC CHARACTERIZATION, IONIC ENVIRONMENTS, ADSORPTION, CELL, ENZYME
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

A systematic study on the zeta potential of polyethersulfone membranes determined by streaming potential measurements was made to examine various salt effects. Chloride salts; KCl, NaCl, CaCl2 and MgCl2 and potassium salts; KCl, KNO3, KClO3, K2CO3, K2SO4 and K2Cr2O7 were used to investigate the effects of cations and anions on the zeta potential of membranes, respectively. The zeta potential was obtained in 0.001 M salt solutions at the range of pH=4.0–8.0. The effect of ionic strength on membrane zeta potential was also investigated in the solution of KCl and Na2HPO4 with 0.001 M-0.1 M salt concentrations. At high pH values, anion adsorption on membrane surface had a more potent effect on zeta potential, while at low pH values, cation adsorption to membrane surface also possessed more potent effect on zeta potential. In general, zeta potential decreased with increasing ionic strength due to the compression of electrical double layer. However, preferential adsorption of ions on the membrane surface is another important parameter affecting zeta potential beside the ionic strength. The influence of ionic strength on the membrane zeta potential can be observed by performing FTIR-ATR analysis.