Design of g-C3N4/BaBiO3 Heterojunction Nanocomposites for Photodegradation of an Organic Dye and Diclofenac Sodium under Visible Light via Interfacial Charge Transfer

摘要

A novel series of the heterojunctions g-CN/BBO(x) of g-C3N4 (g-CN) nanosheets decorated with spherical particles of BaBiO3 (BBO) were designed to enhance photocatalysis through interfacial charge transfer. The synthesized g-CN/BBO(x) nanocomposites were characterized by various techniques such as XRD, FTIR, TEM, and SEM. Rhodamine B (RhB) dye and diclofenac sodium drug were taken as the model pollutants for the degradation under visible light. BBO facilitates the photocatalytic reaction after accepting electrons from the g-CN. The g-CN/BBO(30%) nanocomposite exhibits the best photocatalytic activity, which is 6.5 and 5 times higher than BBO and g-CN, respectively. The enrichment in photodegradation is attributed to the combined effects of improved dye adsorption, visible light absorption, mobility of photogenerated carriers, and facial separation of electrons and holes (e(-), h(+)) as supported by electrochemical impedance spectroscopy (EIS). This study provides new insight into the engineering, design, and stability of the g-CN/BBO(x) heterojunction nanocomposite, as well as on its application and plausible mechanism for removal of harmful and detrimental pollutants such as RhB dye and diclofenac sodium drug under visible light.