Simultaneous removal of Cr(VI) and phenol in a dual-chamber photocatalytic microbial fuel with NiCo2O4/MoS2/GF photocathode
Source abstract
Abstract
Efficient treatment and resource utilization of sewage are of great value for global sustainability. In this study, a composite photocathode was prepared by loading NiCo 2O 4 nanosheets and MoS 2 nanoflowers to a graphite felt (GF)-based electrode through a two-step hydrothermal and calcination method. A photocatalytic microbial fuel cell (PMFC) was constructed using the NiCo 2O 4/MoS 2 /GF photocathode and carbon felt (CF) anode in a dual-chamber H-type battery. Cr(VI) and phenol were employed as target pollutants in the cathode chamber. The photoelectric performance of the NiCo 2O 4/MoS 2/GF photocathode and the removal efficiency of the battery system were studied systematically. When a mixed solution of Cr(VI) and phenol was used, the removal rates of Cr(VI) and phenol after 24 h of light exposure were 8.13 % and 12.65 % higher than those when Cr(VI) or phenol was used alone, respectively. At the same time, the output power density of the battery in the mixed pollutants was 362.7 mW/m 3, which was 45.78 % higher than that in the single Cr(VI) solution (248.8 mW/m 3). The excellent performance of the PMFC was attributed to three reasons: (1) NiCo 2O 4 and MoS 2 were simultaneously excited as two narrow-bandgap semiconductors, and the utilization rate of light energy was increased; (2) The Z-scheme heterojunction between NiCo 2O 4 and MoS 2 improved the separation efficiency of the photoelectric carriers and retained the high valence band of NiCo 2O 4 and low conduction band of MoS 2 to the greatest extent, which is crucial for the PMFC to achieve electronic export and double contaminant removal; and (3) the NiCo 2O 4 nanosheet and MoS 2 nanoflower structures enhanced the contact between the catalysts and the pollutants.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Microbial Fuel Cells and Bioremediation · Electrochemical sensors and biosensors · Advanced Photocatalysis Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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