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Author:

Liu, Yi (Liu, Yi.) | Mao, Ran (Mao, Ran.) | Hao, Jingwei (Hao, Jingwei.) | Wang, Kaifeng (Wang, Kaifeng.) | Hu, Ke (Hu, Ke.) | Cui, Yuexin (Cui, Yuexin.) | Zhao, Xu (Zhao, Xu.)

Indexed by:

EI Scopus SCIE

Abstract:

Photoelectrocatalysis is effective for the oxidation of ammonium (NH4+) due to the ability to produce oxidizing species such as center dot OH and Cl center dot. Compared to center dot OH and Cl center dot, ClO center dot is a more robust species capable of oxidizing NH4+, which can be produced by the combination of center dot OH and Cl center dot with free chlorine. However, the conventional photoelectrochemical (PEC) systems generally prefer to produce Cl center dot for NH4+ oxidation due to the lack of sufficient HOCl. Herein, a UV-driven PEC system consisting of TiO2/Ru-IrO2 bifacial electrode has been constructed for the enhanced ClO center dot generation for NH4+ oxidation. Large amounts of HOCl can be generated at the Ru-IrO2 interface, which can be further activated by UV irradiation to generate Cl center dot and center dot OH, and then rapidly react with HOCl to generate ClO center dot. The Cl center dot and center dot OH generated at the TiO2 interface could also react with HOCl, further accelerating the generation of ClO center dot. Under UV irradiation, the oxidation rate of TiO2/Ru-IrO2 was 6.7 times than TiO2, 1.5 times than Ru-IrO2, and even 1.24 times than the sum of individual TiO2 and Ru-IrO2. In addition, the bifacial electrode achieved highly efficient NH4+ oxidation for the treatment of actual wastewater, eliminating 81.0 mg L-1 of NH4+ in 120 min with a TN removal rate of 98.4%. The UV-driven PEC system with TiO2/Ru-IrO2 bifacial electrode is a promising potential technology for NH4+ oxidation due to its ability to rapidly produce ClO center dot and oxidize NH4+ to N-2 without the addition of chemical reagents.

Keyword:

Chlorine radicals Ammonium oxidation TiO2/Ru-IrO2 bifacial electrode Photoelectrocatalysis

Author Community:

  • [ 1 ] [Liu, Yi]Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
  • [ 2 ] [Mao, Ran]Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
  • [ 3 ] [Hao, Jingwei]Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
  • [ 4 ] [Wang, Kaifeng]Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
  • [ 5 ] [Hu, Ke]Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
  • [ 6 ] [Cui, Yuexin]Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
  • [ 7 ] [Zhao, Xu]Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
  • [ 8 ] [Liu, Yi]Univ Chinese Acad Sci, Beijing 100049, Peoples R China
  • [ 9 ] [Hao, Jingwei]Univ Chinese Acad Sci, Beijing 100049, Peoples R China
  • [ 10 ] [Wang, Kaifeng]Univ Chinese Acad Sci, Beijing 100049, Peoples R China
  • [ 11 ] [Cui, Yuexin]Univ Chinese Acad Sci, Beijing 100049, Peoples R China
  • [ 12 ] [Zhao, Xu]Univ Chinese Acad Sci, Beijing 100049, Peoples R China
  • [ 13 ] [Hu, Ke]Beijing Univ Technol, Fac Mat & Manufacture, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China
  • [ 14 ] [Mao, Ran]18 Shuangqing Rd, Beijing 100085, Peoples R China

Reprint Author's Address:

  • [Mao, Ran]18 Shuangqing Rd, Beijing 100085, Peoples R China;;

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Source :

CHEMICAL ENGINEERING JOURNAL

ISSN: 1385-8947

Year: 2023

Volume: 463

1 5 . 1 0 0

JCR@2022

ESI Discipline: ENGINEERING;

ESI HC Threshold:19

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 14

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 3

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