DEGRADATION OF METHYLENE BLUE IN WATER BY SINGLET OXYGEN GENERATED FROM FLOW-BY REACTOR BASED ON AIR DIFFUSION CATHODE

YAO Jia-xiong; XIE Shi-wei; LIAO Jia-cheng; GUO Shao-dong

doi:10.13205/j.hjgc.202205022

Volume 40 Issue 5

Jul. 2022

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YAO Jia-xiong, XIE Shi-wei, LIAO Jia-cheng, GUO Shao-dong. DEGRADATION OF METHYLENE BLUE IN WATER BY SINGLET OXYGEN GENERATED FROM FLOW-BY REACTOR BASED ON AIR DIFFUSION CATHODE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 152-158. doi: 10.13205/j.hjgc.202205022

Citation:

YAO Jia-xiong, XIE Shi-wei, LIAO Jia-cheng, GUO Shao-dong. DEGRADATION OF METHYLENE BLUE IN WATER BY SINGLET OXYGEN GENERATED FROM FLOW-BY REACTOR BASED ON AIR DIFFUSION CATHODE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 152-158. doi: 10.13205/j.hjgc.202205022

Citation:

YAO Jia-xiong, XIE Shi-wei, LIAO Jia-cheng, GUO Shao-dong. DEGRADATION OF METHYLENE BLUE IN WATER BY SINGLET OXYGEN GENERATED FROM FLOW-BY REACTOR BASED ON AIR DIFFUSION CATHODE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 152-158. doi: 10.13205/j.hjgc.202205022

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DEGRADATION OF METHYLENE BLUE IN WATER BY SINGLET OXYGEN GENERATED FROM FLOW-BY REACTOR BASED ON AIR DIFFUSION CATHODE

doi: 10.13205/j.hjgc.202205022

School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China

Received Date: 2021-03-28
Available Online: 2022-07-02

Abstract

Abstract

In this study, an electrochemical oxidation system consisting of Ti/RuO₂ anode and air diffusion cathode(ADC) was constructed, to oxidative remove methylene blue(MB) in a flow-by reactor. The results showed that the stable concentration of H₂O₂ produced by ADC reached 45.33 mg/L under the current of 200 mA, with a current efficiency of 65.10%. The ADC-RuO₂ system was selective for the oxidation of organic pollutants, since it barely oxidized sodium benzoate but showed a strong decolorizing effect on dyes such as methylene blue. In addition, the oxidizing ability was significantly inhibited in the presence of sodium azide and 2,5 dimethylfuran, suggesting the main active oxidant was singlet oxygen(~1O₂). At the residence time of 2 min and 200 mA, the removal efficiency of 0.1 mmol/L MB reached 99% in the system. Furthermore, the energy consumption for reducing the MB concentration by 90% was 0.25 kW·h/m³.
- electrochemical oxidation,
- air diffusion cathode,
- RuO₂ anode,
- singlet oxygen,
- flow-by reactor

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References

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