Abstract：Using expanded perlite(EP) as a floating carrier, the BiOCl0.6I0.4/GO photocatalyst was synthesized by water bath method and its removal efficiency on Microcystis aeruginosa under visible light was investigated as well. The composition and morphology of synthesized samples were characterized by XRD, SEM, FTIR spectra, UV-Vis DRS and XPS. Results indicated that the synthesized BiOCl0.6I0.4/GO/EP composite showed better algae removal performance than that of BiOCl0.6I0.4/EP and GO/EP. Even after four cycles reuse, the composite still showed better photocatalytic activity. Furthermore, free radical capture experiment proved that photo-generated holes (h+) were the main active species for the inactivation of algae in photocatalytic process. Finally, according to the energy band analysis and free radical capture experiment, the mechanism of BiOCl0.6I0.4/GO/EP composite was proposed.
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