Construction and photocatalytic properties of MOF-808/Bi₂MoO₆ composites

Zirconium-based metal-organic framework and bismuth molybdate composite (MOF-808/Bi2MoO6) was prepared by a simple two-step hydrothermal method. The phase composition, microstructure, optical properties, and photogenerated charge recombination efficiency of the materials were analyzed by X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV visible diffuse reflectance spectroscopy, N-2 adsorption-desorption testing, and electrochemical testing. Compared with pure Bi2MoO6 and MOF-808, the 0.5%-MOF-808/Bi2MoO6 composite exhibited higher photocatalytic activity, and the degradation rate of the antibiotic ciprofloxacin (CIP) reached 89.7% under visible light irradiation for 120 min. Through radical trapping experiments, it was proved that center dot O-2(-) was the main active species, based on which we proposed a possible photocatalytic degradation mechanism.