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In Situ Regeneration of Phenol-Saturated Activated Carbon Fiber by an Electro-peroxymonosulfate Process

  • Haojie Ding
    Haojie Ding
    Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, People’s Republic of China
    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People’s Republic of China
    More by Haojie Ding
  • Ying Zhu
    Ying Zhu
    Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, People’s Republic of China
    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People’s Republic of China
    More by Ying Zhu
  • Yulun Wu
    Yulun Wu
    Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, People’s Republic of China
    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People’s Republic of China
    More by Yulun Wu
  • Jian Zhang
    Jian Zhang
    School of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi 832003, People’s Republic of China
    More by Jian Zhang
  • Huiping Deng
    Huiping Deng
    Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, People’s Republic of China
    More by Huiping Deng
  • Huaili Zheng
    Huaili Zheng
    Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, People’s Republic of China
    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People’s Republic of China
    More by Huaili Zheng
  • Zhen Liu*
    Zhen Liu
    School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, People’s Republic of China
    *Email: [email protected]
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  • , and 
  • Chun Zhao*
    Chun Zhao
    Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, People’s Republic of China
    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, People’s Republic of China
    *Email: [email protected]; [email protected]
    More by Chun Zhao
Cite this: Environ. Sci. Technol. 2020, 54, 17, 10944–10953
Publication Date (Web):August 5, 2020
https://doi.org/10.1021/acs.est.0c03766
Copyright © 2020 American Chemical Society
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Abstract

Regeneration is required to restore the adsorption performance of activated carbon used as an adsorbent in water purification. Conventional thermal and electrochemical regenerations have high energy consumption and poor mineralization of pollutants, respectively. In this study, phenol-saturated activated carbon fiber was regenerated in situ using an electro-peroxymonosulfate (E-PMS) process, which mineralized the desorbed contaminants with relatively low energy consumption. The initial adsorbed phenol (81.90%) was mineralized, and only 4.07% of the initial concentration remained in the solution after 6 h of E-PMS regeneration. The phenol degradation was dominated by hydroxyl radical oxidation. Adding the PMS in three doses at 2 h intervals improves the regeneration performance from 75% to more than 82%. Regeneration retained 60% of its initial effectiveness even in the 10th cycle with 4.40% of the initial concentration of phenol remaining in the solution. These results confirm the E-PMS regeneration process as effective, sustainable, and environmentally friendly for regenerating activated carbon.

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