[논문]광촉매 반응기용 세라믹 막에의 TiO2 층 형성과 성능평가

리즈완 아마드; 김진규; 김종학; 김정환

doi:10.14579/membrane_journal.2017.27.4.328

광촉매 반응기용 세라믹 막에의 TiO2 층 형성과 성능평가
In-situ TiO2 Formation and Performance on Ceramic Membranes in Photocatalytic Membrane Reactor 원문보기

멤브레인 = Membrane Journal, v.27 no.4, 2017년, pp.328 - 335

리즈완 아마드 (인하대학교 환경공학과) , 김진규 (연세대학교 화공생명공학과) , 김종학 (연세대학교 화공생명공학과) , 김정환 (인하대학교 환경공학과)

초록
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메조포러스 공극구조를 갖는 광촉매 멤브레인은 다양한 환경기술에 적용될 수 있다. 본 연구에서는 $TiO_2$ 층을 형성시킨 광촉매 반응기용 세라믹 멤브레인을 개발하고 이를 염색용액 처리에 적용하였다. 높은 공극률과 균질성을 지닌 $TiO_2$ 광촉매층을 그라프트 공중합체를 사용하여 제조하였다. 멤브레인은 광촉매 반응기와 멤브레인 여과를 결합시킨 하이브리드 광촉매 반응기에 성공적으로 적용하였다. 실험결과 정렬된 구조의 $TiO_2$ 층이 $Al_2O_3$ 지지체에 형성되었다. $TiO_2$ 층 형성 후 제조된 세라믹 분리막의 순수 투과도는 형성된 광촉매 층 저항으로 감소하였다. 정렬된 구조의 $TiO_2$ 층은 UV 결합 시 5시간 안에 완벽한 염색용액 분해를 달성시킬 수 있었다. 광촉매 멤브레인의 염색용액 분해는 Langmuir-Hinshelwood 흡착 모델로 잘 설명할 수 있었다. 또한 $TiO_2$ 층이 고정화된 세라믹 멤브레인의 model Congo Red에 대한 1차 속도상수는 $Al_2O_3$ 지지체 단독인 경우에 비해 약 6배 정도 큰 값을 나타내었다(0.0081 vs. $0.0013min^{-1}$).

Abstract ▼ AI-Helper

Fabricating photocatalytic composite membrane with a mesoporous and tailored morphological structure would have significant implication for environmental remediation. In this study, we reported hybrid $TiO_2$ immobilized photocatalytic membrane and its application for the treatment of dye solution. Photocatalytic film with high porosity and homogeneity was fabricated by graft copolymer as polymer template. Hybridization of membrane filtration with photocatalysis was successfully achieved by photocatalytic membrane reactor developed. Result showed that membrane permeability was significantly reduced after immobilizing the $TiO_2$ film on bare $Al_2O_3$ support. The membrane characterization indicated that well organized $TiO_2$ film was successfully formed on $Al_2O_3$ support. Benefiting from the controlled morphology of $TiO_2$ film, the composite membrane exhibited almost complete degradation of organic dye within 5 h of filtration under UV illumination. Langmuir-Hinshelwood model explained degradation of organic dye. First-order rate constant was approximately six times with $TiO_2$ immobilized composite ceramic membrane, higher than the one with the bare $Al_2O_3$ support (0.0081 vs. $0.0013min^{-1}$).

주제어

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가설 설정

5. (a) Photocatalytic degradation profile of Congo Red and (b) kinetic linear fitting curves of Congo Red degradation through bare Al₂O₃ support and TiO₂ immobilized hybrid composite membrane under UV illumination.

제안 방법

In order to confirm the successful fabrication of hybrid photocatalytic composite ceramic membranes, the surface of membranes was analyzed using field emission scanning electron microscopy (FE-SEM, SUPRA 55VP, Carl Zeiss, Germany). The performance of the membranes was evaluated by using a photocatalytic membrane reactor developed in this study, as illustrated in Fig.

대상 데이터

support (nominal pore size 100 nm). The TiO₂ precursor solution with molar ratio of TTIP : H₂O : HCL = 2 : 1 : 1, was prepared. A 0.

이론/모형

The higher removal efficiency of organic compound through TiO₂ immobilized composite ceramic membrane can be attributed to the photocatalytic degradation of dye compound on the membrane under UV illumination[26]. To further elucidate the photocatalytic degradation rate of the membranes towards Congo Red, the kinetic study was carried out using Langmuir-Hinshelwood pseudo-first-order kinetic model[27]. The LangmuirHinshelwood model equation has been proven to appropriate model to estimate the simple photodecomposition rate as shown in eq.

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