可见光下Bi2WO6纳米片高效光降解四环素的机理研究

作为一种窄带隙半导体材料, Bi₂WO₆在光催化降解有机污染物上具有很大的应用潜力。研究采用水热法合成了Bi₂WO₆纳米片, 并在可见光照射下研究其对四环素的光催化降解。利用XRD、FESEM、TEM、吸收光谱等对材料进行结构和形貌的表征。实验发现, 在pH=8的四环素溶液中加入50 mg Bi₂WO₆纳米片, 可见光照射130 min 后, 85%的四环素（50 mL, 50 mg/L）被降解。实验还研究了Bi₂WO₆纳米片光电化学性质, 通过加入不同的自由基捕获剂研究了光催化降解四环素的反应机理。结果表明, Bi₂WO₆纳米片具有较高的电子密度和电子空穴分离效率是其具有良好光催化性能的原因。

Mechanism Study of Tetracycline High Efficient Photodegradation by Bi2WO6 Nanosheets under Visible Light Irradiation

As a narrow band gap semiconductor,Bi2WO6 has great application potential in photo-degradation of organic pollutants,such as tetracycline.In present work,Bi2WO6 nanosheets were successfully synthesized by a hydrothermal method and the photo-degradation of tetracycline under visible light irradiation were investigated.XRD,FESEM,TEM and absorption spectra were used to characterize the structure and morphology of the material.It was found that when adding 50 mg Bi2WO6 nanosheets into 50 mL of tetracycline solution at pH=8,85%tetracycline(50 mL,50 mg/L)was photodegraded within 130 min.The photoelectron-chemical experiments and free radical capture experiments were performed to explore the photo-degradation mechanism.The results show that good photocatalytic performance of Bi2WO6 nanosheets are ascribed to the high electron density and photoelectron-hole separation efficiency.