Preparation and photocatalytic degradation performance of MOF-808/BiOCI composites

A novel MOF-808/BiOCl composite heterojunction material was prepared by combining highly stable MOF-808 with BiOCl by simple hydrothermal method. The photocatalytic performance of composite MOF-808/BiOCl on ciprofloxacin (CIP) was investigated using CIP as a contaminant. Compared with pure BiOCl, the performance of composite materials has been improved. Among them, composites containing 10% MOF-808 (MOF-808/BiOCl-10%) showed the best photocatalytic activity. Within 20 min of UV light irradiation, the photocatalytic degradation efficiency of CIP by MOF-808/BiOCl-10% was as high as 94.7%. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR), fluorescence spectroscopy, ultraviolet-visible diffuse reflection spectroscopy (UV-Vis DRS), photocurrent, electrochemical impedance, and other characterization techniques were performed to analyze the phase composition, morphology and photoelectrochemical properties of materials. The formation of MOF-808 and BiOCl heterojunctions is beneficial to suppress the compounding efficiency of photogenerated carriers and improving photocatalytic activity. The UV-Vis diffuse reflectance spectroscopy results show that the light absorption range of MOF-808/BiOCl-10% material is improved. At the same time, radical trapping experiments were carried out. It indicates that center dot O-2(-) and h(+) are the active species that play a major role in the degradation of CIP by MOF-808/BiOCl-10%. Based on the above experimental data, the possible photocatalytic mechanism of MOF-808/BiOCl composites was proposed.