Abstract
The widespread application of surfactants and their subsequent discharge in the receiving water bodies is a very common issue in developing countries. In the present investigation, a composite of graphitic carbon nitride (GCN) and TiO2 was used as a photo-electro-catalyst in a microbial fuel cell (MFC)-based hybrid system for bio-electricity production and simultaneous pollutant removal (organic matter and sodium dodecyl sulphate, SDS). The GCN: TiO2 composite with a ratio of 70:30 (by wt. %) revealed a better electrochemical response; thus, it was used as a photo-electro-catalyst in MFC. Additionally, the photochemical characterization indicated a decrease in the band gap and charge recombination of GCN-TiO2 composite compared to standalone TiO2, which indicated a conducive effect of GCN addition. Further, on the actual use as a photo-electro-catalyst, the GCN-TiO2 catalysed MFC attained 58.2 ± 9.6% and 86.5 ± 7.1% of COD and SDS removal; while simultaneously harvesting a maximum power density of 1.07 W m–3, which was higher than standalone TiO2-catalysed MFC. The follow-up treatment in the charcoal bio-filter and photo-cathodic chamber of the hybrid system further improved the overall COD and SDS removal efficiency to 92.1 ± 2.7 and 95.6 ± 1.5%, respectively. The electro-catalytic performance of the GCN-TiO2 can be attributed to the presence of nitrogen-active species in the composite. The results of this investigation demonstrated a potential MFC-based hybrid system for the simultaneous secondary and tertiary treatment of municipal wastewater. Consequently, the outcome of this investigation indicates an innovative research direction in the field of photo-electro-catalyst, which can fit into the role of a photo-catalyst as well as an electro-catalyst.
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Shreeniwas Madhav Sathe: Conceptualization, Investigation, Writing—original draft,
Manikanta Manmadha Doki: Writing- original draft and Investigation.
Subrata Mandal: Writing- original draft.
Rajakumar Ananthakrishnan: Supervision, Writing—review & editing.
Brajesh Kumar Dubey: Supervision, Writing—review & editing.
Makarand Madhao Ghangrekar: Supervision, Writing—review & editing, Funding acquisition.
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Sathe, S.M., Doki, M.M., Mandal, S. et al. Composite of graphitic carbon nitride and TiO2 as photo-electro-catalyst in microbial fuel cell. Environ Sci Pollut Res (2023). https://doi.org/10.1007/s11356-023-28849-3
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DOI: https://doi.org/10.1007/s11356-023-28849-3