Abstract
Abstract The binary flower-like BiOI/CoFe2O4 photocatalysts with magnetic retrievability were successfully synthesized via coprecipitation method. The effects of composite ratio on the microstructure, morphology, optical, photo-electrochemical and photocatalytic properties of the samples were studied. The experimental results show that BiOI/CoFe2O4 nanocomposites contain tetragonal structure BiOI and cubic spinel structure CoFe2O4 with good crystallization. Spherical CoFe2O4 nanoparticles are uniformly decorated on the surface of BiOI nanosheets to establish hierarchical flower-like 3D- BiOI/CoF2O4 heterojunctions. BiOI/CoFe2O4 nanocomposites show excellent visible light absorption ability. PL spectra show the intensity decrease for BiOI/CoFe2O4 nanocomposites. BiOI/CoFe2O4 nanocomposites can promote the separation of photon-generated carriers, improve the migration efficiency, and improve the redox activity of nanocomposites. BiOI/CoFe2O4 nanocomposites exhibit better photocatalytic activity during the process of degrading the RhB dye solution under the irradiation of simulated visible light. The degradation efficiency of BiOI/CFO-3 photocatalysts is 80.24% after 3 cycles, and exhibit better recyclable stability. Also, ·O2− is the main reactive species in the degradation process, which plays a crucial role in the RhB degradation.
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