Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Removals of PAH-quinones Using Birnessite-Mediated Oxidative-Transformation Processes

망간산화물(Birnessite)을 매개로한 산화-변환반응을 이용한 PAH-퀴논화합물의 제거

  • Choi, Chan-Kyu (Department of Energy and Environment, The Graduate School of Energy and Environment, Seoul National University of Science and Technology) ;
  • Harn, Yoon-I (Department of Energy and Environment, The Graduate School of Energy and Environment, Seoul National University of Science and Technology) ;
  • Kim, Seong-Uk (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Shin, Hyun-Sang (Department of Environmental Engineering, Seoul National University of Science and Technology)
  • 최찬규 (서울과학기술대학교 에너지환경대학원 에너지환경공학과) ;
  • 한윤이 (서울과학기술대학교 에너지환경대학원 에너지환경공학과) ;
  • 김성욱 (서울과학기술대학교 환경공학과) ;
  • 신현상 (서울과학기술대학교 환경공학과)
  • Received : 2011.06.02
  • Accepted : 2011.06.26
  • Published : 2011.06.30
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Abstract

An investigation on the removals of PAH-quinone compounds, which are commonly produced from the biological and/or chemical treatments of PAH-contaminated soils, from the aqueous phase via birnessite (${\delta}-MnO_2$)-mediated oxidative transformation is described. It was demonstrated that acenaphthenequinone (APQ), p-PAH quinone can be removed via birnessite-mediated oxidative-coupling reactions, and anthraquinone (AQ) and 1,4-naphthoquinone (1,4-NPQ), o-PAH quinones were efficiently removed by birnessite-mediated cross-coupling reactions in the presence of catechol (CAT) as a reactive mediator. The removals of PAH-quinone compounds followed pseudo-first-order reactions, and the rate constant (k, $hr^{-1}$) for the removals of 1,4-NPQ under the experiment conditions (1,4-NPQ = 10 mg/L, CAT = 50 mg/L, ${\delta}-MnO_2$ = 1.0 g/L, pH 5, Reaction time = 6~96 hr) was 0.0426, which was about 4 times lower than that of APQ (0.173). With the observed pseudo-first order rate constants with respect to birnessite loadings under the same experimental conditions, the surface-normalized specific rate constant, $K_{surf}$, for 1,4-NPQ was determined to be $8.5{\times}10^{-4}L/m^2{\cdot}hr$. The analysis of the kinetic data with respect to birnessite loading indicated that the cross-coupling reactions of 1,4-NPQ consist of two different reaction steps over time and the results have also been discussed in terms of the reaction mechanisms.

본 연구에서는 PAHs 오염토양의 화학적 생물학적 처리과정에서 반응부산물로 흔히 발견되는 PAH-퀴논화합물을 대상으로 수용액 상에서의 망간산화물에 의한 산화-변환 제거 특성(제거율, 반응속도)을 조사하였다. 반응시간 경과에 따른 상등액의 HPLC 분석결과로부터 p-퀴논화합물인 Acenaphthenequinone (APQ)는 망간산화물 자체에 의한 산화-결합 반응을 통해 제거되며, o-퀴논화합물인 Anthraquinone (AQ)와 1,4-Naphthoquinone (1,4-NPQ)는 반응매개체(Catechol) 존재 하에서의 교차-결합반응을 통해 효과적으로 제거 가능함을 확인하였다. 망간산화물에 의한 PAH-퀴논화합물의 제거는 유사-일차 반응 속도식을 따랐으며, 본 실험조건(1,4-NPQ = 11.5 mg/L, CAT = 50 mg/L, $MnO_2$ = 1.0 g/L, pH 5, 반응시간 = 6~96 hr)에서의 1,4-NPQ의 교차-결합 반응속도상수(k, $hr^{-1}$)는 0.0426으로 APQ의 산화-결합 반응속도 상수(0.173)에 비교해 약 4배 정도의 차이를 보였다. 동일조건에서의 망간산화물 주입량별 속도상수를 망간산화물의 비표면적으로 표준화하여 얻은 1,4-NPQ의 교차-결합 반응에 대한 비표면적표준화속도상수($K_{surf}$)는 $8.5{\times}10^{-4}L/m^2{\cdot}hr$이었다. 망간산화물 주입량별 제거특성과 반응 속도상수의 비교 해석 결과로부터 1,4-NPQ의 교차-결합 반응은 반응시간 경과에 따라 서로 다른 반응기작을 거침을 확인하였으며, 이를 기존 문헌결과와 함께 해석하였다.

Keywords

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