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Photocatalytic degradation of polybrominated diphenyl ethers in pure water system

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Abstract

Due to the low water solubility of polybrominated diphenyl ethers, organic solvent is usually added into the oxidation system to enhance the removal efficiency. In this study the photocatalytic degradation of decabromodiphenyl ether (BDE209), a type of polybrominated diphenyl ether used throughout the world, in pure water without the addition of organic solvent was investigated. In the pure water system, BDE209 was not dissolved but dispersed as nano-scale particles with a mean diameter of 166 nm. Most of BDE209 (>98%) were removed within 4 h and the final debromination ratio was greater than 80%. Although the addition of organic solvent (tetrahydrofuran, THF) could lead to a relatively high BDE209 degradation rate, the final debromination ratio (<50%) was much lower than that in pure water system. Major oxidation intermediates of tetrahydrofuran, including tetrahydro-2-furanol and γ-butyrolactone, were detected indicating the engagement of THF in the BDE209 degradation process. The photocatalytic degradation of BDE209 in the pure water system followed first-order kinetics. The BDE209 degradation rate constant increased from 0.0011 to 0.0023 min−1 as the pH increased from 3 to 9.

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Authors and Affiliations

  1. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Min Zhang & Yiliang He

  2. Indian River Research and Education Center, University of Florida, Fort Pierce, FL, 34945, USA

    Jian Lu & P. Chris Wilson

Authors
  1. Min Zhang
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  2. Jian Lu
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  3. Yiliang He
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  4. P. Chris Wilson
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Correspondence to Jian Lu or Yiliang He.

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Zhang, M., Lu, J., He, Y. et al. Photocatalytic degradation of polybrominated diphenyl ethers in pure water system. Front. Environ. Sci. Eng. 10, 229–235 (2016). https://doi.org/10.1007/s11783-014-0762-x

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  • DOI: https://doi.org/10.1007/s11783-014-0762-x

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