High specific surface area graphene-like biochar for green microbial electrosynthesis of hydrogen peroxide and Bisphenol A oxidation at neutral pH.
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75% confidenceA graphene-like biochar was used as a cathode catalyst in a ceramic membrane-fitted MFC to generate hydrogen peroxide and degrade bisphenol A, achieving a high specific surface area and efficient removal of BPA.
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Abstract
Green electrosynthesis of hydrogen peroxide (H 2 O 2 ) is a research hotspot in environmental chemistry, particularly for wastewater and sanitation applications, with microbial fuel cells (MFCs) offering a self-sustaining route for in situ production. This investigation showcases the application of chemically activated bagasse biochar (AcBC), a graphene-like carbon material, as a cathode catalyst in a ceramic membrane-fitted MFC for H 2 O 2 generation and bisphenol A (BPA) degradation. The AcBC had an exceptionally high specific surface area of 1604 m 2 /g and mimicked the physicochemical characteristic of graphene. The MFC having the AcBC-catalysed cathode attained a maximum H 2 O 2 yield of 248. 9 ± 12.5 mg/L (retention time of 12 h) and peak power density of 125.62 ± 5.62 mW/m 2 . Moreover, this system was tailored into a bioelectro-Fenton system by doping Zn-Fe over AcBC (Zn-Fe/AcBC) that instigated hydroxyl radical formation, thus responsible for removing 95.46 ± 3.50 % of Bisphenol A (BPA, initial concentration = 10 mg/L) in 300 min. Total organic carbon (initial concentration = 47.1 ± 2.3 mg/L) of BPA-containing real wastewater was reduced by 51.4 ± 3.6 % in 300 min while consistently achieving >90 % removal of BPA over eight continuous cycles. Thus, this research demonstrates the potential of biomass-derived graphene-like carbon in catalyzing green H 2 O 2 synthesis for removal of biorefractory organics while achieving sustainable wastewater treatment.