Spherical Bi 4 O 5 I 2 /MoS 2 QDs Nanocomposites Activate Persulfate to Degrade Tetracycline Under Visible Light

Photocatalytic activation of persulfate is considered to be a promising purification technology. In this study, a novel nanospherical composite material is synthesized by loading MoS 2 Quantum Dots on Bi 4 O 5 I 2 . MoS 2 Quantum Dots enhance the activity of the composite material and separation efficiency of electrons and holes. Meanwhile the composite material demonstrates a strong photocurrent response by optoelectronic analysis. In addition, the light absorption range is further expanded. Based on the improvement of photoelectric properties and light absorption performance, the BM0.5%/PS/Vis system exhibits the most excellent performance with a degradation rate of 69.7% for tetracycline within 60 min. The degradation mechanism is verified through free radical capture experiments, the radicals involve in degradation are ·OH, ·SO 4 − , ·O 2 − and 1 O 2 . The possible degradation pathway of tetracycline is proposed by liquid chromatography‐mass spectrometry (LC‐MS). This work is expected to provide a research direction for the application of modified bismuth halide in PS activation.