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

摘要： 分别采用超声分散法、水热法和焙烧法制备了g-C₃N₄/WO₃ 异质结催化剂,采用XRD、UV-Vis、氮气吸附、XPS、荧光光谱、EIS(阻抗谱)等多种手段对制备的催化剂进行表征。结果表明,制备方法对异质结组分间的结合强弱有显著影响,导致电子空穴分离效率迥异。模拟可见光下降解罗丹明B(RhB)和分解水制氢气作为探针反应来考察产品光催化性能,可得出三种异质结产品催化性能全部优于单个组分,而且水热法制备的产品催化性能最佳。

关键词: 石墨相氮化碳, 三氧化钨, 异质结材料, 光催化