상변환/졸-겔법에 의한 ZrO2 나노입자 함유 Polyethersulfone 한외여과 막의 제조

국문 초록 (Abstract)

상변환과 졸-겔 반응을 동시에 행하는 새로운 제막법으로 나노크기의 ZrO2 입자가 함유된 비대칭형 PES-ZrO2 복합 막을 제조하였다. PES-ZrO2 복합 막 제조의 최적 제막 조건을 복합 막에의 인 흡착실험을 수행하여 인 흡착량이 최대가 되는 조건으로서 결정하였는바, 최적 제막 조건은 캐스팅 용액에 1 mL의 PES 당 0.15 mL의 Zr(PrO)4 첨가 및 비용매 1 L에 1 mL Zr(PrO)4 당 30 mL의 HNO3 촉매를 첨가했을 때 이었다. 복합 막의 단면 구조, 막성능 및 ZrO2 입자 함유량 변화를 SEM, 순수투과량, TGA, ICP, XRD 및 접촉각 측정을 통해 결정하였는바, 캐스팅 용액에의 Zr(PrO)4 첨가량이 증가할수록 순수 투과량이 증가하며, ZrO2 입자 함유량은 1 mL의 PES 당 0.15 mL의 Zr(PrO)4 첨가했을 때 최대가 되었다. 복합 막의 표면 특성을 친수성으로 개선하기 위하여 인산처리를 하였으며, 인산처리 전후(前後)의 두 종류 PES-ZrO2 복합 막을 대상으로 한 BSA 용액의 dead-end 한외여과 실험을 수행하여 막오염 형성의 억제 정도를 평가한 결과 인산처리 시킨 복합 막의 경우 투과량과 BSA 배제도 모두 약 40% 정도 증가하였는데 이는 복합 막을 인산처리 시킴으로서 막특성이 친수화 되었기 때문이다.

다국어 초록 (Multilingual Abstract)

The asymmetric hybrid membranes of polyethersulfone (PES) and ZrO2 nanoparticles were prepared via new one-step procedure combining simultaneously the phase-inversion method and the sol-gel technique. The optimum contents of Zr(PrO)4 and HNO3 catalyst were determined by the adsorption experiments of phosphate anion onto the resulting hybrid membranes. The maximum adsorption of phosphate anion is obtained at the conditions of 0.15 mL Zr(PrO)4 addition per 1 mL PES and 30 mL HNO3 addition per 1 mL Zr(PrO)4. Variation of morphology, performance and incorporated ZrO2 amount of the resulting hybrid membranes were discussed and determined using SEM, pure water flux, TGA, ICP, XRD and contact angle measurements. Increasing Zr(PrO)4 addition into casting solution, pure water flux is increased and ZrO2 amount in the hybrid membrane is maximized at the conditions 0.15 mL Zr(PrO)4 addition per 1 mL PES. The prephosphatation of PES-ZrO2 hybrid membrane was studied to modify the surface characteristics of membrane. Ultrafiltration of bovine serum albumin (BSA) solution was performed in a dead-end cell using both a bare (non-phosphated) and a phosphated hybrid membrane. It is revealed that both the permeate flux and BSA rejection were increased as about 40% by prephosphatation of hybrid membrane. These results may be explained on the basis of the increase of membrane hydrophilicity, which was determined from contact angle measurements.

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