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Journal of the Electrochemical Society, Vol.164, No.12, II726-II733, 2017
Liquid Phase Deposition of alpha-Fe2O3/ZnO Heterojunction Film with Enhanced Visible-Light Photoelectrocatalytic Activity for Pollutant Removal
We developed liquid phase deposition (LPD) technique to prepare alpha-Fe2O3/ZnO heterojunction film for efficient removal of pollutants by visible-light-driven photoelectrocatalysis (PEC). The deposition of alpha-Fe2O3 on ZnO film was confirmed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The UV-visible diffuse reflectance spectra (DRS) indicated that the formation of alpha-Fe2O3 on the surface of ZnO film led to redshift of the absorption edge. Meanwhile, the photoluminescence (PL) spectra revealed that the recombination of photogenerated electrons and holes on alpha-Fe2O3/ZnO film was remarkably inhibited. As a result, the alpha-Fe2O3/ZnO film exhibited higher visible-light PEC activity than single alpha-Fe2O3 or ZnO film. Using the visible-light-activated alpha-Fe2O3/ZnO film with optimized alpha-Fe2O3, we studied the effective PEC degradation of diclofenac (DCF) and 4-chlorophenol (4-CP), which represented the emerging and persistent organic pollutants, respectively. Moreover, the alpha-Fe2O3/ZnO film was successfully applied to simultaneous removal of 4-CP and Cu2+ in wastewater by visible-light PEC process, demonstrating the wide applicability of the LPD alpha-Fe2O3/ZnO heterojunction film for pollutant removal. (C) 2017 The Electrochemical Society. All rights reserved.