본 연구는 역삼투막의 물리-화학적 표면 개질을 통하여 친수성 증가에 따른 내오염성 및 내염소성을 향상하고자 하였다. 자외선조사로 상용막 표면을 활성화한 후 실란 커플링제를 sol-gel법으로 개질하여 염소에 대한 민감도를 낮춰 폴리 아마이드 활성층을 보호하여 내염소성을 향상시켰다. 또한, 에폭사이드의 개수가 다른 PGPE, SPE 두 종류의 에폭시로 코팅 후 에폭사이드의 개환반응으로 내오염성을 향상시켰으며, 표면 개질 조건은 접촉각과 FT-IR, XPS 분석을 통해 최적화하였다. 실란-에폭시 개질막의 오염성 평가 결과 투과도 감소율이 상용막보다 약 1.5배 감소하였고, 내염소성 평가 결과 20,000 ppm × hr에서도 염제거율이 90% 이상 유지되었다.

The purposes of this paper were to improve both fouling and chlorine resistance by increasing the hydrophilicity of the reverse osmosis membrane. In order to improve chlorine resistance, the surface of RO membrane was activated by ultraviolet irradiation, and then it was modified by the sol-gel method using Octyltriethoxysilane (OcTES) such as the silane coupling agent to low sensitivity to chlorine, thereby the polyamide active layer was protected and chlorine resistance was improved. In addition, polyglycerol polyglycidyl ether (PGPE) and sorbitol polyglycidyl ether (SPE) coating with different number of epoxides, ring opening reaction of epoxide improved the anti-fouling resistance. The surface modification condition was optimized by FT-IR, XPS, and contact angle analysis. As a result, the permeability reduction rate of the silane-epoxy modified membrane after the fouling test was decreased about 1.5 times as compared with that of the commercial membrane. And the salt rejection was maintained over 90% at 20,000 ppm × hr even after chlorine resistance test.

요 약
 1. 서 론
 2. 실 험
  2.1. 시약 및 재료
  2.2. 표면 개질 방법
  2.3. 표면 분석
  2.4. 특성 평가 방법
 3. 결과 및 고찰
  3.1. UV etching 시간에 따른 역삼투막의 특성
  3.2. 개질막의 표면 특성 분석
  3.3. 개질막의 물성평가
 4. 결 론
 Reference

• 박희민(경희대학교 공과대학 화학공학과) | Hee Min Park (Department of Chemical Engineering, College of Engineering, Kyung Hee University)
• 양원용(경희대학교 공과대학 화학공학과) | Won Yong Yang (Department of Chemical Engineering, College of Engineering, Kyung Hee University)
• 이용택(경희대학교 공과대학 화학공학과) | Yong Taek Lee (Department of Chemical Engineering, College of Engineering, Kyung Hee University) Corresponding author