Abstract
? 2021 Elsevier B.V.The heterogeneous visible-light driven photo-electro-Fenton (H-VL-PEF) system was built to degrade tetracycline using nitrogen/oxygen biomass self-doped porous carbon (NO/PC) cathode catalyst coupling CuFeO2/biochar particle catalyst. The NO/PC possessed the H2O2 selectivity of 85.3%, and the gas diffusion electrode with NO/PC as cathode catalyst (NO/PC-GDE) exhibited fine H2O2 electrogeneration performance and stability. The generated electrons on CuFeO2/biochar by electrostatic induction and light excitation promoted [tbnd]Fe3+/[tbnd]Fe2+ and [tbnd]Cu2+/[tbnd]Cu+ redox cycle, which was beneficial for HO?/O2?- formation and tetracycline degradation. The introduction of CuFeO2/biochar catalyst and visible light could reduce energy consumption and promote tetracycline mineralization. The CuFeO2/biochar loads, initial pH and current density of H-VL-PEF system were optimized. The degradation pathway of tetracycline was speculated based on the intermediates identified by HPLC/MS. Escherichia coli growth inhibition experiments and toxicity prediction analysis demonstrated that the comprehensive toxicity of tetracycline was alleviated due to the catalytic degradation of H-VL-PEF system.
NSTL
Elsevier