In-situ growth of lepidocrocite on Bi2O3 rod: A perfect cycle coupling photocatalysis and heterogeneous fenton-like process by potential-level matching with advanced oxidation

gamma -FeOOH was grown in situ on the surface of rod Bi2O3 to construct a perfect cycle coupling photocatalysis and heterogeneous Fenton-like process. The degradation efficiency of this system was detected under the irradiation of visible light. gamma-FeOOH/Bi2O3 showed better degradation efficiency than pure Bi2O3 and gamma-FeOOH, and the amount of TOC was decreased to 4.3, suggesting that the system exhibits outstanding oxidation ability that MO and phenol could be degraded to CO2 and H2O totally. PL spectra, trapping experiments and ESR test were also carried out to confirm the mechanism of photocatalysis with heterogeneous Fenton-like process, and the suitable conduction band (CB) of Bi2O3 matches the electric potential of iron ions was proved to be the key to keep the perfect cycle. Then optimal concentration of H2O2, the effect of pH and the stability of the photocatalyst were also investigated. (C) 2018 Elsevier Ltd. All rights reserved.