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采用煅烧法合成Bi2O3/g-C3N4复合光催化剂。利用X射线衍射(XRD)、红外光谱(FT-IR)、紫外-可见漫反射(UV-Vis)和荧光光谱(PL)等手段对催化剂的结构和光学性能进行表征。结果表明:复合光催化剂由Bi2O3和g-C3N4组成,其在可见光区的吸收较Bi2O3和g-C3N4有所提高,荧光强度较g-C3N4有所降低。光催化亚甲基蓝结果显示:在可见光下照射3h,Bi2O3/g-C3N4(12.3%)光催化剂对亚甲基蓝的降解率达91%,表观降解速率常数(k)为0.74h-1,分别是Bi2O3和g-C3N4的4.1倍和2.4倍。Bi2O3/g-C3N4复合光催化剂具有比Bi2O3和g-C3N4更高的可见光催化活性。
Bi2O3 / g-C3N4 composite photocatalyst was synthesized by calcination. The structure and optical properties of the catalysts were characterized by XRD, FT-IR, UV-Vis and PL spectroscopy. The results showed that the composite photocatalyst consisted of Bi2O3 and g-C3N4, its absorption in the visible region was higher than that of Bi2O3 and g-C3N4, and its fluorescence intensity was lower than that of g-C3N4. The photocatalytic methylene blue results showed that the degradation rate of methylene blue was 91% and the apparent degradation rate constant (k) was 0.74h-1 for Bi2O3 / g-C3N4 (12.3%) photocatalyst under visible light irradiation for 3h. 4.1 times and 2.4 times g-C3N4. Bi2O3 / g-C3N4 composite photocatalyst has higher photocatalytic activity than Bi2O3 and g-C3N4.