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摘要:
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.
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来源 :
CHEMICAL ENGINEERING JOURNAL
ISSN: 1385-8947
年份: 2023
卷: 463
1 5 . 1 0 0
JCR@2022
ESI学科: ENGINEERING;
ESI高被引阀值:19
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