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Highly efficient electro-oxidation catalyst under ultra-low voltage for degradation of aspirin

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Abstract

A novel cryptomelane-Ir (cry-Ir) electrode is prepared for Ir to enter into the cryptomelane (named as cry-Mn) structure and used for aspirin degradation. This catalyst can efficiently reduce the Ir usage from 85 to 34%. Also, the onset potential of cry-Ir is about 1.40 V and the over potential is about 0.34 V at 10 mA cm−2, indicating that cry-Ir has an excellent oxygen evolution reaction (OER) activity to produce oxidizing species and can decrease electrolytic voltage during the electro-oxidation process. So, the electrical efficiency per log order (EE/O) for cry-Ir electrode is only 5% of PbO2 electrode, which is the best electrode for organic degradation. Also, cry-Ir has large tunnel size which favors insertion of aspirin molecule into cry-Ir structure and enhances the contact between reactive intermediates and the contaminant. Using cry-Ir as anode, 100% aspirin removal and 55% chemical oxygen demand (COD) removal could be obtained at 4 V. We also compare cry-Ir electrode with IrO2 and find that IrO2 anode can only eliminate 20% aspirin under the same condition. As a result, cry-Ir is a promising anode material for organic pollutant degradation.

Aspirin removal after 4h under different voltages. Aspirin removal on IrO2/Ti-f and cry-Ir/Ti-f after 4h.

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Authors and Affiliations

  1. School of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, People’s Republic of China

    Xiaolei Kang, Wei Sun, Limei Cao & Ji Yang

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  1. Xiaolei Kang
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  2. Wei Sun
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  3. Limei Cao
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  4. Ji Yang
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Correspondence to Ji Yang.

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Responsible editor: Vítor Pais Vilar

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Kang, X., Sun, W., Cao, L. et al. Highly efficient electro-oxidation catalyst under ultra-low voltage for degradation of aspirin. Environ Sci Pollut Res 24, 25881–25888 (2017). https://doi.org/10.1007/s11356-017-0207-8

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  • DOI: https://doi.org/10.1007/s11356-017-0207-8

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