Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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The Effect of Initial pH and Dose of $TiO_2$ on Chloroform Removal in Photocatalytic Process using Compound Parabolic Concentrator Reactor System

CPCs를 이용한 $TiO_2$ 광촉매반응공정에서 초기 pH와 촉매농도가 클로로포름 분해에 미치는 영향

  • Cho, Sang-Hyun (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Cui, Mingcan (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Nam, Sang-Geon (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Jung, Hee-Suk (Center for Environmental Technology Research, Korea Institute of Science and Technology) ;
  • Khim, Jee-Hyeong (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 조상현 (고려대학교 건축사회환경공학과) ;
  • 최명찬 (고려대학교 건축사회환경공학과) ;
  • 남상건 (고려대학교 건축사회환경공학과) ;
  • 정희숙 (한국과학기술연구원 물환경센터) ;
  • 김지형 (고려대학교 건축사회환경공학과)
  • Received : 2010.11.09
  • Accepted : 2010.12.27
  • Published : 2010.12.31
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Abstract

To evaluate the solar photocatalytic degradation efficiency of chloroform in a real solar-light driven compound parabolic concentrators (CPCs) system, $TiO_2$ was irradiated with a metalhalide lamp (1000 W), which has a similar wavelength to sunlight. The results were applied to a pilot scale reactor system by converting the data to a standardized illumination time. In addition, the effects of initial pH and the $TiO_2$ dose on the photocatalytic degradation of chloroform were investigated. The results were compared with the specific surface area (S.S.A) and particle size of $TiO_2$, which changed according to the pH, to determine the relationship between the S.S.A, particle size and the photocatalytic degradation of chloroform. The experiment was carried out at pH 4~7 using 0.1, 0.2, 0.4 g/L of $TiO_2$. The particle size and specific surface area of $TiO_2$ were measured. There was no significant difference between the variables. However, pH affects the particle size distribution and specific surface area of $TiO_2$. Inaddition, the activation of a photocatalyst did not show a linear relationship with the specific surface area of $TiO_2$ in the photocatalytic degradation of chloroform.

본 연구에서는 Compound parabolic concentrator reactor system을 이용하여 초기농도 10 mg/L의 클로로포름을 광촉매 반응으로 처리하였다. 1000 W의 메탈할라이드 방전램프를 인공태양광원으로 사용하였으며 약 99%의 클로로포름이 광촉매반응에 의하여 90분 안에 제거되어 먹는물 수질기준인 0.08 mg/L을 만족하였다(pH 5.24, $TiO_2$ 농도 0.2 g/L). 또한 초기 pH와 $TiO_2$ 농도가 클로로포름의 분해에 미치는 영향 을 알아보기 위해 pH 4, 5, 6, 7과 $TiO_2$ 농도 0.1, 0.2, 0.4의 조건에서 실험을 수행하였으며, 각 pH 에서의 $TiO_2$ 입자크기(particle size)와 비표면적(specific surface area)을 측정하여 클로로포름 분해율과 비교하여 비표면적과 광촉매반응 활성 사이의 상관관계를 규명하고자 하였다. 그 결과 pH와$TiO_2$ 농도에 따른 클로로포름 분해율은 큰 차이를 보이지 않았다. 하지만 pH에 따라 $TiO_2$의 입자크기분포(particle distribution)와 비표면적이 변했고 pH 7은 다른 pH 영역보다 비표면적이 약 2배 정도 작은 결과를 보였다. 본 연구의 결과를 바탕으로 클로로포름의 광촉매반응은 $TiO_2$의 비표면적과 상관관계가 없는 TCE-type인 것을 유추할 수 있었다.

Keywords

References

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