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- 2015
Ag和介孔碳改性Bi2WO6光催化剂的合成及其可见光下的光催化性能
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Abstract:
采用水热法合成了花球状的Bi2WO6和介孔碳CMK-3/Bi2WO6的光催化剂, 然后通过光还原得到了Ag负载的Ag/Bi2WO6和Ag-CMK-3/Bi2WO6, 制备出可见光下具有高活性的光催化剂。利用紫外-可见漫反射光谱(UV-Vis DRS)、X射线衍射(XRD)、透射电子显微镜(TEM)、高分辨透射电子显微镜(HR-TEM)和扫描电子显微镜(SEM)对制备的样品进行表征, 评价样品在可见光照射下降解亚甲基蓝(MB)的光催化活性。并研究了CMK-3和Ag负载在Bi2WO6上都能提高其光催化活性的机制。结果表明: CMK-3或Ag负载在Bi2WO6上都能大幅提高Bi2WO6的光催化活性, Ag-CMK-3/Bi2WO6光催化剂的光催化性能优于Ag/Bi2WO6和CMK-3/Bi2WO6光催化剂。 Flower sphere-like Bi2WO6 and mesoporous carbon CMK-3/Bi2WO6 photocatalysts were synthesized by hydrothermal method, and then Ag/Bi2WO6 and Ag/CMK-3/Bi2WO6 were prepared via a photoreduction process in order to obtain the photocatalysts with high visible light activities. The as-prepared samples were characterized by ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), X-ray diffraction (XRD), transmission electron microscope(TEM), high resolution transmission electron microscope (HR-TEM) and scanning electron microscope (SEM). The photocatalytic activities of the samples were evaluated by the photodegradation of methylene blue (MB) under visible light irradiation. The mechanism for the enhancement of the photocatalytic activity of CMK-3 and Ag-loaded Bi2WO6 was also investigated. The results show that CMK-3 or Ag loading greatly improves the photocatalytic activity of Bi2WO6, the photocatalytic activity of Ag/CMK-3/Bi2WO6 photocatalyst is superior to the activities of CMK-3/Bi2WO6 and Ag/Bi2WO6 photocatalysts. 江苏大学高级人才基金(10JDG114)
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