Abstract
In this study, direct Z-scheme NH2-UiO-66/Bi4O5I2 heterostructures were successfully synthesized to harness visible light for the degradation of tetracycline (TC), thereby evaluating the photocatalytic activity of the materials. NH2-UiO-66/Bi4O5I2 demonstrated robust photocatalytic efficacy under visible light irradiation, with NU/BOI-80 exhibiting the highest TC removal rate (91 %) within 120 min. Through UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS) and Photoluminescence (PL) diagram analysis, it was found that NH2-UiO-66/Bi4O5I2 shows good photocatalytic properties. Mott-Schottky and electrochemical impedance spectroscopy (EIS) indicated the enhanced separation efficiency of electron-hole pairs within the material, thereby mitigating recombination losses. In addition, free radical capture experiments and the combination of electron spin resonance (ESR) showed that ·O2−and h+ were the main active species. At the same time, NH2-UiO-66/Bi4O5I2 has been confirmed to have good stability. Finally, a proposed photocatalytic electron transfer mechanism was formulated based on the characterization and experimental results. This study presents a promising avenue for leveraging metal-organic framework photocatalysts for the effective removal of TC.
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