棒状Ag2CO3/SrCO3的制备与高可见光光催化活性

Fabrication of Ag2CO3/SrCO3 rods with Highly Efficient Visible-light Photocatalytic Activity

摘要:

以AgNO3, Sr(NO3)2和Na2CO3为前驱体，通过简单的沉淀法制备了棒状。用X-射线衍射，扫描电镜，氮吸附-脱附等温曲线表征了所制备的样品。通过在可见光下降解甲基橙来检测光催化活性。结果表明，随着Ag2CO3/SrCO3摩尔比的减小，Ag2CO3/SrCO3棒逐渐变细变短。棒状Ag2CO3/SrCO3显示了极好的可见光光催化活性，与单一的Ag2CO3和SrCO3比较，Ag2CO3/SrCO3复合物的活性增强，摩尔比为1:5的Ag2CO3/SrCO3棒活性最高。棒状Ag2CO3/SrCO3的高活性是由于其高比表面积和它们之间形成了异质结协同作用的结果。

Abstract:

Ag2CO3/SrCO3 rods were prepared by a facile precipitation method using AgNO3, Sr(NO3)2, and Na2CO3 as precursors. The as-prepared samples were characterized by X-ray di?raction (XRD), scanning electron microscopy (SEM), nitrogen adsorption–desorption isotherms, and UV-visible (UV-vis) diffuse reflectance spectroscopy. The photocatalytic activity was evaluated by photodegradation of methyl orange (MO) aqueous solutions under visible-light irradiation (λ > 420 nm). The results show that Ag2CO3/SrCO3 rods become thinner and shorter with the decrease of Ag2CO3/SrCO3 molar ratio. The as-prepared Ag2CO3/SrCO3 rods showed excellent visible-light photocatalytic activity. Moreover, Ag2CO3/SrCO3 composites exhibited an enhanced photocatalytic acticity compared with that of the monocompoment Ag2CO3 and SrCO3. Ag2CO3/SrCO3 rods with the Ag2CO3/SrCO3 molar ratio of 1:5 exhibited the highest activity due to the synergetic effects of the large surface area and the heterostructure.