立方体形Ag3PO4可见光光催化剂的制备及其性能研究

以AgNO3、Na2HPO4和NH3.H2O为主要原料,利用银氨辅助法成功制备出了在可见光照射下具有高的光催化活性的立方体形Ag3PO4光催化剂.利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FTIR)和紫外可见光谱仪(UV-Vis)等分别对Ag3PO4样品的晶相组成、微观形貌和吸光度等进行了表征,并且考察了该光催化剂在模拟太阳光照射下对罗丹明溶液的光催化降解效果.结果表明,所制备出的立方体形Ag3PO4晶体是由6个{100}晶面包裹而成,与球形的Ag3PO4样品相比,立方体形的Ag3PO4样品表现出更优越的光催化活性,这主要是由于由高活性的{100}晶面主导的立方体形Ag3PO4样品对可见光有更高的吸收能力、更高的电子与空穴分离效率,以及更多的光催化活性中心.

Synthesis and characterization of cubic Ag3PO4 visible light photocatalyst

Cubic silver orthophosphate photocatalyst with good activity was successfully fabricated through a simple silver-ammine assisted method by using AgNO3, Na2 HPO4 and NH3 ·H2O. X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared spectrometer and UV-vis diffuse reflectance spectrometer were employed to investigate the phase structure, micro morphology and absorbance of Ag3PO4 powders. The photocatalytic activity of Ag3PO4 photocatalyst was tested by the photocatalytic degradation of Rhodamine B aqueous solution under the simulated sunlight irradiation. The results reveal that the asprepared cubic Ag3PO4 crystals are bounded entirely by six of {100} facets and exhibit much better photocatalytic activity than spheres. This is due to the higher absorption efficiency of the visible light photons,effectively separation of electrons and holes and catalytically active sites on their surfaces of cubic silver orthophosphate photocatalyst which is dominated by the highly active { 100} facets.