Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Measurements and methods for analyzing zeta potential of the external surface of hollow fiber membranes

중공사막 외부표면의 제타전위 측정방법 고찰

  • 이태섭 (고려대학교 건축.사회환경공학부 물환경플랜트공학 연구실) ;
  • 이상엽 (고려대학교 건축.사회환경공학부 물환경플랜트공학 연구실) ;
  • 이주희 (고려대학교 건축.사회환경공학부 물환경플랜트공학 연구실) ;
  • 홍승관 (고려대학교 건축.사회환경공학부 물환경플랜트공학 연구실)
  • Received : 2009.04.30
  • Accepted : 2009.06.12
  • Published : 2009.06.15
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Abstract

A new method and equipment for measuring the zeta potential of the external surface of hollow fiber (HF) membranes is reported. An existing commercial streaming potential analyzer in conjunction with home-made test cells was used to determine the electrokinetic surface characteristics of various HF membranes. It was shown that measurements of the external surface of HF membrane using the home-made test cells designed in this study were easy and reliable. The zeta potential values were quite accurate and reproducible. By varying the physical shape of the test cells to adjust hydrodynamics inside the test cells, several upgrade versions of home-made test cells were obtained. It was shown that the zeta potential of the external surface of HF membranes was most influenced by membrane materials as well as the way of surface modification. However, the overall surface charge of tested HF membranes were much less than that of commercial polyamide thin-film-composite (TFC) reverse osmosis (RO) membranes due to the lack of surface functional groups. For the HF membranes with the same material, the effect of pore size on the zeta potential was not significant, implying the potential of accurate zeta potential measurements for various HF membranes. The results obtained in this study are expected to be useful for better understating of electrokinetic surface characteristics of the external surface of HF membranes.

Keywords

Acknowledgement

Supported by : 국토해양부

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