Abstract
Herein we have assembled CdS nanoparticles onto the surface of Bi4Ti3O1 (BTO) hierarchical microspheres to construct core-shell BTO/CdS heterojunction photocatalysts. The as-prepared samples are systematically analyzed by various methods (e.g., XRD, SEM, TEM, XPS, UV–vis DR spectroscopy and FTIR spectroscopy), confirming the formation of core-shell structured BTO/CdS composites. Photocurrent response and EIS analyses demonstrate that enhanced separation of photogenerated electron-hole pairs is realized in the BTO/CdS heterojunctions. Simulated-sunlight driving photodegradation of methylene blue (MB) reveals that the optimal composite sample 20%BTO/CdS is endowed with a photocatalytic activity about 1.6 and 3.3 times higher than that of bare CdS and BTO, respectively. Moreover, the 20%BTO/CdS heterojunction photocatalyst also exhibits excellent photocatalytic elimination of methyl orange (MO)/rhodamine B (RhB)/MB mixture dyes, ciprofloxacin (CIP), sulfamethoxazole (SMX), tetrabromobisphenol A (TBBPA) and Cr(VI) ions. The enhanced photocatalytic mechanism of the BTO/CdS heterojunction photocatalysts was discussed based on a Z-scheme carrier transfer process.
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