超声调控Ag/g-C_3N_4复合材料及光催化性能研究

Ultrasonic Preparation and Photocatalytic Activity of Ag/g-C_3N_4 Composite Photocatalyst

通过固相加热制备g-C_3N_4,超声调控获得片层状g-C_3N_4,光照Ag NO3与g-C_3N_4成功制备了Ag/gC_3N_4复合光催化材料。利用X射线衍射仪(XRD)以及扫描电子显微镜(SEM)分析产物的物相和形貌,采用紫外-可见吸收光谱表征样品的光学性能。以罗丹明B为模拟污染物,评价超声样品Ag/g-C_3N_4的可见光(λ≥420nm)催化性能。实验结果表明,与纯g-C_3N_4相比,超声的Ag/g-C_3N_4复合光催化材料在可见光下降解罗丹明B的光催化活性最好。分析表明Ag与g-C_3N_4的协同作用抑制光生电子-空穴的复合是可见光催化活性增强的主要原因。

g-C3N4 photocatalytic materials were prepared by solid-phase heating and ultrasonic. Furthermore,Ag/g-C3N4 composite photocatalytic materials were successfully prepared by Ag NO3 and g-C3N4. The phase and morphology of the sample were analyzed by X-ray diffraction（ XRD） and scanning electron microscopy（ SEM）. The light absorption of the sample was characterized by UV-Vis absorption spectroscopy. The visible light photocatalytic activity（ λ≥420 nm） was evaluated by rhodamine B as a simulated pollutant. The results showed that the synergistic effect of Ag and g-C3N4 suppresses the recombination of photo-generated electron-hole pairs.