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Efficient abatement of an iodinated X-ray contrast media iohexol by Co(II) or Cu(II) activated sulfite autoxidation process

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Abstract

Efficient abatement of an iodinated X-ray contrast media iohexol by an emerging sulfite autoxidation advanced oxidation process is demonstrated, which is based on transition metal ion–catalyzed autoxidation of sulfite to form active oxidizing species. The efficacy of the combination of sulfite and transition metal ions (Ag(I), Mn(II), Co(II), Fe(II), Cu(II), Fe(III), or Ce(III)) was tested for iohexol abatement. Co(II) and Cu(II) are proven to show more pronounced catalytic activity than other metals at pH 8.0. According to the quenching studies, sulfate radical (SO4•−) is identified to be the primary species for oxidation of iohexol. Increasing dosages of metal ion or sulfite and higher pH values are favorable for iohexol abatement. Inhibition of iohexol abatement is observed in the absence of dissolved oxygen, which is vital for the production of SO5•− and subsequent formation of SO4•−. Overall, activation of sulfite to produce reactive radicals with extremely low Co(II) or Cu(II) concentrations (in the range of μg L−1) in circumneutral conditions is confirmed, which offers a potential SO4•−-based advanced oxidation process in treatment of aquatic organic contaminants.

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Funding

This work was funded by the National Natural Science Foundation of China (Grant No. 51808233) and the Scientific Research Funds of Huaqiao University.

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Authors and Affiliations

  1. College of Chemical Engineering, Huaqiao University, Xiamen, 361021, China

    Xiaodan Zhao, Wenjing Wu & Yonggui Yan

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  1. Xiaodan Zhao
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  2. Wenjing Wu
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  3. Yonggui Yan
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Correspondence to Xiaodan Zhao.

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Responsible editor: Vítor Pais Vilar

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Highlights

• Co(II) and Cu(II) exhibit excellent catalytic activity for sulfite autoxidation.

• Co(II)/sulfite or Cu(II)/sulfite achieve rapid abatement of iohexol at neutral pH.

• Sulfate radical is identified as the main active species for iohexol degradation.

• Bicarbonate facilitates iohexol abatement in Co(II)/sulfite process.

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Zhao, X., Wu, W. & Yan, Y. Efficient abatement of an iodinated X-ray contrast media iohexol by Co(II) or Cu(II) activated sulfite autoxidation process. Environ Sci Pollut Res 26, 24707–24719 (2019). https://doi.org/10.1007/s11356-019-05601-4

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  • DOI: https://doi.org/10.1007/s11356-019-05601-4

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