F和Cu共掺杂Bi_2WO_6水热法合成及可见光催化性能

Hydrothermal Synthesis and Visible-Light Photocatalytic Properties of F and Cu Co-doped Bi_2WO_6

通过一步水热法制备了F和Cu共掺Bi_2WO_6样品。用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-vis DRS)对其进行表征。XPS确定了Cu^(2+)、Cu^+和F^-共存于Bi_2WO_6晶格中。F和Cu掺杂使Bi_2WO_6样品光学带隙变小,扩大对可见光响应范围。在室内弱自然光照下,1%F-2%CuBi_2WO_6样品催化活性最好,在150 min内对RhB的降解效率达到97.4%。这种利用室内弱自然光驱动降解反应不需要额外消耗资源的光源,因此它是一种绿色节能的环境清洁策略。

F and Cu co-doped Bi2WO6 sample shave been successfully obtained by a facile one-step hydrothermal reaction. They were characterized by X-ray diffraction patterns（XRD）,scanning electron microscopy（SEM）,X-ray photoelectron spectroscopy（XPS）,and UV-vis diffuse reflec-tance spectra（DRS）. The presence of Cu2＋,Cu＋ and F- dopants in Bi2WO6 was confirmed by XPS. The doping of F and Cu narrowed the band gap and expanded the light response to visible light. 1% F-2% Cu-Bi2WO6 presents the highestcatalytic activity and its photodegradation efficiency could reach 97. 4% within 150 min. This natural indoor weak sunlight-drivendegradation reaction does not need an extra optical system that inevitably consumes fossil resources,therefore it is a green,energy-saving environmental cleaning strategy.