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Photocatalytic Degradation and Detoxification of Bisphenol A Using TiO2 Nanoparticles

TiO2 나노입자 광촉매 반응에 의한 비스페놀 A의 분해 제거 및 독성 저감

A-Yeong Jo1
,
Jinho Jung1*
조 아영1
,
정 진호1*
1Division of Environmental Science and Ecological Engineering, Korea University
1고려대학교 환경생태공학부
*교신저자. *Corresponding Author. 
31 December 2015. pp. 330-336
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Abstract

Photocatalytic degradation of bisphenol A (BPA) in aqueous solution was investigated using TiO2 nanoparticles (Degussa P25) in this study. After a 3 hr photocatalytic reaction (λ = 365 nm and I = 3 mW cm-2, [TiO2] = 2.0 g L-1), 98% of BPA (1.0×10-5 M) was degraded and 89% of the total organic carbon was removed. In addition, BPA degradation by photolytic, hydrolytic and adsorption reactions was found to be 2%, 5% and 13%, respectively. The reaction rate of BPA degradation by photocatalysis decreased with increasing concentration of methanol that is used as a hydroxyl radical scavenger. This indicates that the reaction between BPA and hydroxyl radical was the key mechanism of BPA degradation. The pseudo-first-order reaction rate constant for this reaction was determined to be 7.94×10-4 min-1, and the time for 90% BPA removal was found to be 25 min. In addition, acute toxicity testing using Daphnia magna neonates (< 24 h old) was carried out to evaluate the reduction of BPA toxicity. Acute toxicity (48 hr) to D. magna was decreased from 2.93 TU (toxic unit) to non-toxic after photocatalytic degradation of BPA for 3 hr. This suggests that there was no formation of toxic degradation products from BPA photocatalysis.

Keywords
Acute toxicity
Bisphenol
Daphnia magna
Hydroxyl radical
Photocatalysis

본 논문은 수용액에서 TiO2 나노입자 (Degussa P25) 광촉매 반응에 의한 비스페놀 A (BPA)의 분해 제거를 연구하였다. 3시간의 광촉매 반응 (자외선 파장 = 365 nm, 자외선 강도 = 3 mW cm-2, TiO2 농도 = 2.0 g L-1)에 의하여 98%의 BPA (1.0×10-5 M)와 89%의 총유기탄소가 제거되었다. 그리고 광분해, 가수분해와 흡착반응에 의한 BPA의 분해 제거는 각각 2%, 5%와 13%로 나타났다. 광촉매 반응에 의한 BPA의 분해 제거는 수산화 라디칼의 소광제인 메탄올의 농도가 증가 할수록 감소하였다. 이것은 BPA와 수산화 라디칼의 반응이 BPA 분해 제거의 주요한 기작이라는 것을 나타낸다. 이 반응의 초기 유사 1차 속도 상수는 7.94×10-4 min-1로 계산되었으며, BPA 90%를 분해 제거하는 시간은 25분으로 나타났다. 그리고 광촉매 반응에 의한 BPA의 독성 저감을 평가하기 위하여 물벼룩 (Daphnia magna, 생후 24시간 미만)을 이용한 급성독성 시험을 실시하였다. 물벼룩에 대한 BPA의 급성독성 (48시간)은 초기 2.93 TU (독성 단위)였으며, 3시간의 광촉매 반응 후에는 무독성으로 나타났다. 이것은 BPA의 광촉매 반응에서 독성 분해산물이 생성되지 않는 다는 것을 제시한다.

키워드
급성독성
비스페놀
물벼룩
수산화 라디칼
광촉매 반응
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Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 2
  • No :4
  • Pages :330-336
  • Received Date : 2015-12-05
  • Revised Date : 2015-12-08
  • Accepted Date : 2015-12-20
  • DOI :https://doi.org/10.17820/eri.2015.2.4.330
Journal Informaiton Ecology and Resilient Infrastructure Ecology and Resilient Infrastructure
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