Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Membrane Permeation Characteristics and Fouling Control through the Coating of Poly(vinyl alcohol) on PVDF Membrane Surface

PVDF막 표면에 폴리비닐알코올 코팅을 통한 분리막의 투과특성 및 막오염 제어

  • Jang, Hanna (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Kim, In-Chul (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Lee, Yongtaek (Department of Chemical Engineering, Chungnam National University)
  • 장한나 (한국화학연구원 산업바이오화학연구그룹) ;
  • 김인철 (한국화학연구원 산업바이오화학연구그룹) ;
  • 이용택 (충남대학교 화학공학과)
  • Received : 2014.06.30
  • Accepted : 2014.08.12
  • Published : 2014.08.30
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Abstract

In this study, a hydrophobic polyvinylidene fluoride (PVDF) membrane was modified by coating neutral hydrophilic poly(vinyl alcohol). The flux of pure water was measured and then fouling test was conducted with bovin serum albumin (BSA) as model protein foulant. As a result, the experiments showed that pure water flux was decreased but anti-fouling property was significantly enhanced. Pure water flux with increasing molecular weights of the polymer was decreased and fouling resistance was enhanced. Also, Pure water flux with increasing solution concentration was decreased and fouling resistance was enhanced. It is probably due to the increase in hydrophilicity and decrease in roughness of the membrane surface, as revealed by contact angle and AFM analysis.

본 연구에서는 소수성 PVDF막 표면에 중성 친수성 고분자인 Poly(vinyl alcohol) (PVA)를 코팅한 후 순수 투과도를 측정하고 대표적인 단백질 오염물질인 bovin serum albumin (BSA)에 대하여 파울링 실험을 수행하였다. BSA 용액 20 ppm 조건에서 파울링 실험을 수행한 결과, 코팅 전 막에 비하여 순수 투과도는 감소하였지만 내오염성은 현저히 증가됨을 알 수 있었다. 코팅된 PVA의 분자량이 커질수록 순수 투과도는 감소하였으나, 내오염성이 증가하는 경향을 보였다. 또한, 코팅된 PVA의 농도가 높아질수록 순수 투과도는 감소하였고, 내오염성이 증가하였다. 이는 접촉각과 AFM 측정 결과와 관련하여 코팅 후 막 표면에 친수성의 증가와 거칠기가 감소했기 때문으로 여겨진다.

Keywords

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