No abstract

In this work, bismuth hexacyanoferrate/graphene/carbon fibers composite (BiHCF/GN/CFs) was used as a multifunctional air diffusion electrode, which exhibited a promising catalytic effect in air O 2 reduction (ORR) during photo-electro-Fenton process (PEF). BiHCF/GN/CFs, being a heterogeneous photo-electro-Fenton catalyst in PEF, could further simultaneously generate H 2 O 2 and • OH in ORR, and the generating rate of • OH was 0.31 mmoL h −1 . The photo-electro-catalytic properties of BiHCF/GN/CFs in PEF process were evaluated using three types of dye wastewater including methyl orange (MO), methylene blue (MB) and rhodamine B (RB). MO, MB and RB could be, respectively, decolorized with three first-order kinetic constants of 8.9 h −1 , 3.3 h −1 and 3.0 h −1 at the same mass ratio of 3.8/1 in pH 4.0, 0.1 M Na 2 SO 4 . The degradation efficiency of MO was excellent with a higher TOC removal rate.