Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 277, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119227
Keywords
Carbonate radical; Superoxide radical; Refractory pollutants degradation; Energy recovery; Photocatalytic fuel cell (PFC)
Funding
- Shanghai International Science and Technology Cooperation Fund Project [18520744900]
- National Nature Science Foundation of China [21776177, 21875139]
- SJTU-AEMD
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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 center dot- and O-2(center dot-) radicals. The CO3 center dot- radical was produced by the photoelectrode of TiO2/Si photovoltaic cell with the rear Si photovoltaic cell providing external bias, and the O-2(center dot-) 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.
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