Estimation of Pore Size and Surface Charge Density of Ultrafiltration Membrane by Streaming Potential Measurement

• Nakamura Kazuho

  Yokohama National University Graduate School of Engineering, Department of Chemical Engineering

• Hirayama Wakako

  Yokohama National University Graduate School of Engineering, Department of Chemical Engineering

• Nittami Tadashi

  Yokohama National University Graduate School of Engineering, Department of Chemical Engineering

• Matsumoto Kanji

  Yokohama National University Graduate School of Engineering, Department of Chemical Engineering

Bibliographic Information

Other Title

• 流動電位法による限外ろ過膜の細孔径と表面荷電密度の評価
• リュウドウ デンイホウ ニ ヨル ゲンガイ ロカ マク ノ サイコウケイ ト ヒョウメン カデン ミツド ノ ヒョウカ

Abstract

Electric conductivity (λ) dependency of streaming potential (SP) was measured to estimate the pore size and the surface charge density of the commercial ultrafiltration (UF) membranes having different nominal molecular weight cut-off (NMWCO). At the same λ value the absolute value of SP decreased with the decrease in NMWCO in the range of λ＞1×10–2 S/m. The pore size and surface charge density of UF membrane could be determined by the analysis of λ dependence of streaming potential in the range of λ＞1×10–2 S/m applying a mathematical equation of space charge model. In order to obtain the relation between two pore sizes estimated by SP measurement and the actual separation performance of UF membrane, the MWCO of the UF membrane was measured with 0.03wt% PEG solution. The pore size estimated by SP measurement showed a good linear relation with the Stokes diameter of PEG which has the molecular weight corresponding to MWCO of UF membrane tested. These observations mean the pore size estimated by SP measurement is correlated with the separation performance of UF membrane.

Journal

• MEMBRANE

  MEMBRANE 31 (6), 325-331, 2006

  THE MEMBRANE SOCIETY OF JAPAN

Keywords

• ultrafiltration membrane
• streaming potential
• molecular weight cut-off
• pore size
• surface charge density

Details

• CRID: 1390282681398098688
• NII Article ID: 10018407442
• NII Book ID: AN0023215X
• DOI: 10.5360/membrane.31.325
• ISSN: 18846440
• ISSN: 03851036
• NDL BIB ID: 8588663
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8588663
• Web Site: https://www.jstage.jst.go.jp/article/membrane/31/6/31_325/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed