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Bi 2 O 2 CO 3 /Bi 2 MoO 6 heterojunction catalysts were prepared by treating Bi 2 MoO 6 sheets with aqueous NaHCO 3 solutions at room temperature. All the Bi 2 O 2 CO 3 /Bi 2 MoO 6 heterojunctions exhibited higher activities than pristine Bi 2 MoO 6 in the photocatalytic degradation of rhodamine B (RhB), methyl orange, and ciprofloxacin under visible-light irradiation, and the most active photocatalyst was found to be the one with a C/Bi molar ratio of ∼1/2.3. Relevant samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, N 2 adsorption-desorption, Fourier transform infrared spectroscopy, and UV-vis spectroscopy. The higher activity of Bi 2 O 2 CO 3 /Bi 2 MoO 6 than pristine Bi 2 MoO 6 is explained by the enhanced separation and transfer of photogenerated electron/hole pairs, as verified by transient photocurrent densities, photoluminescence spectroscopy, and electrochemical impedance spectroscopy. Photogenerated holes (h + ) and superoxide radical anions ( • O 2  - ) were found to be the main active species. The good reusability of Bi 2 O 2 CO 3 /Bi 2 MoO 6 was testified by cycling degradation of RhB and tetracycline hydrochloride.

Facile Formation of Bi2O2CO3/Bi2MoO6 Nanosheets for Visible Light-Driven Photocatalysis

Facile Formation of Bi₂O₂CO₃/Bi₂MoO₆ Nanosheets for Visible Light-Driven Photocatalysis