Ag3PO4/g-C3N4复合材料制备及其光催化性能

Preparation and photocatalytic application of g-C3N4/Ag3PO4 composites

摘要:

采用原位沉淀法制备了Ag3PO4/g-C3N4复合材料，利用XRD、SEM、TEM、UV-Vis DRS和PL等技术对其进行表征。结果显示，g-C3N4呈现二维片状结构，Ag3PO4为立方晶相的类球状结构，且均匀分布在g-C3N4表面。以亚甲基蓝（MB）为模拟污染物，考察g-C3N4与Ag3PO4的不同摩尔比对MB降解率的影响。结果表明，在Ag3PO4/g-C3N4的摩尔比为1:0.7时，Ag3PO4/g-C3N4复合材料的光催化活性最佳，可见光照30 min后MB降解率即达到100%。光催化剂稳定性较好，重复使用5次，MB降解率仍达到85.24%。降解机理研究表明，h 和e-是降解MB的主要活性物质。

Abstract:

The Ag3PO4/g-C3N4 composites were prepared by in-situ precipitation method and characterized by XRD, SEM, TEM, UV-Vis-DRS and PL. The results showed that g-C3N4 exhibited a graphite-like and flake-like structure, while Ag3PO4 indicated a spherical-like structure with cubic crystal phase, which were evenly distributed on the surface of g-C3N4. By using methylene blue (MB) as a simulated pollutant, the effect of different molar ratios of g-C3N4/Ag3PO4 on the photdegradation rate were studied. The results showed that when the molar ratio was 1:0.7, the photocatalytic activity was the best, and the MB degradation rate could reach 100% after 30 min of visible light irradiation. The photocatalyst indicated high stability, as the degradation rate retained 85.24% after repeated use of the same photocatalyst for 5 times. The mechanism of degradation research shows that h and e- are the main active substances in photdegrading MB.