Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Surface Modification of Nanofiltration Membrane with Silane Coupling Agents for Separation of Dye

실란 표면 개질된 나노복합막의 염료 분리 특성

  • Park, Hee Min (Department of Chemical Engineering, College of Engineering, Kyung Hee University) ;
  • Lim, Jee Eun (Department of Chemical Engineering, College of Engineering, Kyung Hee University) ;
  • Kim, Seong Ae (Department of Chemical Engineering, College of Engineering, Kyung Hee University) ;
  • Lee, Yong Taek (Department of Chemical Engineering, College of Engineering, Kyung Hee University)
  • 박희민 (경희대학교 공과대학 화학공학과) ;
  • 임지은 (경희대학교 공과대학 화학공학과) ;
  • 김성애 (경희대학교 공과대학 화학공학과) ;
  • 이용택 (경희대학교 공과대학 화학공학과)
  • Received : 2018.12.21
  • Accepted : 2018.12.28
  • Published : 2018.12.31
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Abstract

In this study, the commercial nanofiltration membranes were modified with octyltrimethoxysilane(OcTMS) and (3-aminopropyl)trimethoxysilane (APTMS) to improve fouling resistance and to separate dye. The chemical structure and binding energy of elements of silane-deposited surface were analyzed using XPS analysis. And the morphology and hydrophilicity property of silane-modified NF membrane were analyzed using FE-SEM, EDX, AFM, and contact angle. The surface charge of silane-modified NF membrane was characterized by zeta potentiometer analyzer. As a result, silane-modified NF membrane improved fouling resistance about 2 times as compared with that of the commercial membrane. And the silane-modified NF membranes effectively were removed cation dye over 98%.

본 연구에서는 염색 염료 산업의 폐수 처리 및 재활용 공정에 분리막을 적용하고자 실란 커플링제를 이용하여 상용화된 나노복합막을 표면 개질하였다. 실란 커플링제는 말단 관능기가 다른 octyltrimethoxysilane (OcTMS)와 (3-aminopropyl) trimethoxysilane (APTMS)을 사용하였으며, 표면 개질을 통해 염료 분리 및 내오염성을 향상시키고자 하였다. XPS, FE-SEM, EDX 분석을 통하여 막 표면의 화학 구조 변화 및 실란 적층을 확인하였고, AFM 분석을 통해 개질막의 표면 모폴로지를 확인하였다. Zeta potential을 통해 실란 개질 막이 상용막 대비 표면 전하가 중성으로 변하는 것을 확인하였다. 그 결과, OcTMS와 APTMS로 개질한 막의 내오염성은 NE70에 비해 약 2배 이상 향상되었다. 또한, 실란으로 표면 개질한 나노복합막은 음이온 염료(Orange II) 용액에서 약 90% 이상, 양이온 염료(Safranin-O) 용액에서 약 98% 이상의 염료 제거율을 나타내어 양이온 염료 용액 처리에 적합한 것을 확인하였다.

Keywords

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