Photodecomposition of tetrabromobisphenol A in aqueous humic acid suspension by irradiation with light of various wavelengths

Sang Kuk Han, Toshihide Yamasaki, Ken ichi Yamada

研究成果: ジャーナルへの寄稿学術誌査読

22 被引用数 (Scopus)

抄録

The reactive species generated in aqueous 3,3',5,5'-tetrabromobisphenol A (TBBPA)/humic acid (HA) suspensions above the TBBPA pKa (~ 7.4), under various light-irradiation conditions, namely ambient and ultraviolet light, were investigated using electron paramagnetic resonance (EPR) spectroscopy and liquid chromatography-mass spectrometry (LC-MS). We confirmed that singlet oxygen and OH radicals are the key reactive oxygen species generated at wavelengths greater than 400 and 300 nm, respectively. The amount of 2,6-dibromo-p-benzosemiquinone anion radicals (2,6-DBSQ.-) formed under irradiation at 400 nm increased linearly with respect to irradiation time; the initial reaction rate was 7.03 × 10-9 mol g-1 HA s-1. The rate increased with increasing pH and light intensity. LC-MS and EPR spectroscopy showed that tribromohydroxybisphenol A was formed under irradiation at 300 nm via reaction of OH radicals with TBBPA. This study, for the first time, shows that the main byproducts formed during irradiation at wavelengths above 300 nm are 2,6-DBSQ.- and tribromohydroxybisphenol A, generated from singlet oxygen (1O2) and OH radicals, respectively. Photodecomposition of TBBPA in the environment may occur by formation of 1O2 and OH radicals.

本文言語英語
ページ(範囲)124-130
ページ数7
ジャーナルChemosphere
147
DOI
出版ステータス出版済み - 3月 1 2016

!!!All Science Journal Classification (ASJC) codes

  • 環境工学
  • 化学一般
  • 環境化学
  • 汚染
  • 公衆衛生学、環境および労働衛生
  • 健康、毒物学および変異誘発

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