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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

Jo, A-Yeong;Jung, Jinho
조아영;정진호

  • Received : 2015.12.05
  • Accepted : 2015.12.20
  • Published : 2015.12.30

Abstract

Photocatalytic degradation of bisphenol A (BPA) in aqueous solution was investigated using $TiO_2$ nanoparticles (Degussa P25) in this study. After a 3 hr photocatalytic reaction (${\lambda}=365nm$ and $I=3mW\;cm^{-2}$, $[TiO_2]=2.0g\;L^{-1}$), 98% of BPA ($1.0{\times}10^{-5}M$) 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 $7.94{\times}10^{-4}min^{-1}$, 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

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Acknowledgement

Grant : 기후변화 영향 및 취약성 통합평가 모형 요소 기술 개발: 산림, 농업 부문