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以Al_2O_3和硼改性的石墨相氮化碳(g-C_3N_4B)为原料,利用表面氢氧根修饰结合超声分散的方法制备了具有不同Al_2O_3含量的一系列复合光催化剂Al_2O_3/g-C_3N_4B。通过X射线衍射、紫外—可见漫反射光谱和光致发光光谱对Al_2O_3/g-C_3N_4B进行表征,以亚甲基蓝(MB)为目标化合物,考察了Al_2O_3/g-C_3N_4B的光催化活性。结果表明:Al_2O_3/g-C_3N_4B对MB具有较好的光催化降解性能,其中Al_2O_3质量分数为40%的Al_2O_3/g-C_3N_4B光催化活性最佳。在MB光催化降解过程中,·O_2~-和h~+起了重要作用,而H_2O_2与·OH的作用可以忽略。
A series of composite photocatalysts Al_2O_3 / g-C_3N_4B with different content of Al_2O_3 were prepared by surface modification of hydroxyl and ultrasonic dispersion by using Al_2O_3 and boron-modified graphite carbon nitride (g-C_3N_4B) as raw materials. The Al_2O_3 / g-C_3N_4B was characterized by X-ray diffraction, UV-Vis diffuse reflectance spectroscopy and photoluminescence spectra. The photocatalytic activity of Al_2O_3 / g-C_3N_4B was investigated with methylene blue (MB) as the target compound. The results showed that Al 2 O 3 / g-C 3 N 4 B had better photocatalytic activity on MB, of which Al 2 O 3 / g-C 3 N 4 B with the mass fraction of Al 2 O 3 was the best. During the photocatalytic degradation of MB, O 2 ~ - and H ~ + played an important role, while the effect of H 2 O 2 and · OH was negligible.