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分别以尿素、三聚氰胺为前驱体,采用缩聚法制备了不同形貌及性能的类石墨相氮化碳(g-C3N4)光催化剂,采用XRD、SEM、TEM、UV-Vis、FTIR、BET和荧光光谱对g-C_3N_4进行表征,考察了不同前驱体对催化剂形貌及在甲醇溶液中光催化还原CO_2效率的影响。结果表明:以尿素为前驱体制备的u-g-C_3N_4呈片状结构,光催化还原CO_2制备甲酸甲酯的效率较高,为512.8μmol/(gcat·h);以三聚氰胺为前驱体制备的m-g-C_3N_4呈块状结构,光催化效率为257.3μmol/(gcat·h)。
The g-C3N4 photocatalysts with different morphologies and properties were prepared by polycondensation using urea and melamine as precursors. XRD, SEM, TEM, UV-Vis, FTIR, BET and fluorescence Spectra were used to characterize g-C_3N_4. The effect of different precursors on the morphology and photocatalytic reduction of CO_2 in methanol solution was investigated. The results showed that ug-C_3N_4 prepared by urea as a precursor had a sheet-like structure, and the photocatalytic reduction of CO_2 was more efficient for the preparation of methyl formate, which was 512.8μmol / (gcat · h). The melamine- C_3N_4 was massive structure, photocatalytic efficiency of 257.3μmol / (gcat · h).