关键词: 石墨相氮化碳, 三氧化钨, 异质结材料, 光催化

Abstract: Three different methods (ultrasonic dispersion, hydrothermal method and calcination) were used to prepared g-C₃N₄/WO₃  heterojunctions. Obtained catalysts were characterized with X-ray diffraction (XRD), UVvis spectroscopy, nitrogen adsorption, X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), and Electrochemical impedance spectroscopy (EIS). The results showed that the interaction between g-C₃N₄/WO₃  and WO₃ was obviously affected by the preparation methods, resulting in the significant difference in separation rate of photogenerated electrons and holes. The photocatalytic performances were detected in photocatalytic Rhodamine B (RhB) degradation under simulated visible light. The results indicated that activities of g-C₃N₄/WO₃  heterojunction composites were evidently higher than that of single g-C₃N₄/WO₃  or WO₃ semiconductor, and the heterojunction semiconductor prepared by the hydrothermal method showed the highest photocatalytic activity.

Key words: g-C₃N₄, WO₃, Heterojunction composites, Photocataly