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The synergic generation of CO3[rad]− and O2[rad]− radicals in a novel photocatalytic fuel cell for efficient oxidation of carbonate-containing wastewater and simultaneous electricity production

Chen, F ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apcatb.2020.119227
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. The treatment of refractory wastewater and energy utilization are challenging environmental issues. Carbonate as the most common anion abounds in the aquatic environment. Here, we proposed a novel method to degrade carbonate-containing wastewater and simultaneous electricity generation via the combined oxidation of CO3[rad]− and O2[rad]− radicals. The CO3[rad]− radical was produced by the photoelectrode of TiO2/Si photovoltaic cell with the rear Si photovoltaic cell providing external bias, and the O2[rad]− radical was produced from the generation of H2O2 on a gas diffusion electrode (GDE), and they were both further enhanced from the activation reaction of H2O2 with HCO3− electrolyte. The result showed that a high degradation ratio of 91.97 % was achieved in 120 min for a typical refractory organics of rhodamine b (RhB), which is more than double of that in traditional system by using Pt black as cathode and SO42− as electrolyte. In addition, this system could achieve electricity production with a 28.9 % increase when adding RhB. Moreover, the mechanism of efficient degradation and electricity generation were also studied. The proposed system provides a novel way for organics efficient degradation and simultaneous electricity production in carbonate-containing wastewater. © 2020 Elsevier B.V
  6. Keywords:
  7. Carbonate radical ; Energy recovery ; Photocatalytic fuel cell (PFC) ; Refractory pollutants degradation ; Superoxide radical ; Carbonation ; Diffusion in gases ; Electrodes ; Electrolytes ; Energy utilization ; Fuel cells ; Oxide minerals ; Photoelectrochemical cells ; Photovoltaic cells ; Refractory materials ; Rhodamine B ; Silicon ; Titanium dioxide ; Wastewater treatment ; Aquatic environments ; Efficient oxidations ; Electricity generation ; Electricity production ; Environmental issues ; Gas diffusion electrodes ; Refractory wastewater ; Traditional systems ; Electric power generation
  8. Source: Applied Catalysis B: Environmental ; Volume 277 , 2020
  9. URL: https://www.sciencedirect.com/science/article/pii/S0926337320306421