科研之友
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摘要
Novel Eu, F-codoped BiVO4 microspheres with diameter of 1-3 mu m were successfully fabricated via a hydrothermal route. The effects of Eu and F doping on the morphology and crystal structure were intensively investigated by some physicochemical characterizations like N-2 physical adsorption, X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscopy (TEM), UV-Vis diffuse reflectance (UV-vis DRS), X-ray photoelectron spectroscopy (XPS) and photoelectrochemical measurements. The characterization results revealed that the doping of Eu3+ induced the formation of BiVO4 microspheres and the phase transformation in BiVO4 crystal, from monoclinic to tetragonal phase. The Eu3+ doping slightly shifted the absorption edge of BiVO4 to the direction of UV region. F- doping clearly increased the crystallinity of BiVO4. Moreover, Eu and F co-doping gave rise to the synergetic effects, e.g. the increase in surface area and high separation efficiency of the photo-generated electrons (e(-)) and holes (h(+)). The photocatalytic performance test in degradation of rhodamine B showed that these Eu, F-codoped BiVO4 microspheres displayed much higher photocatalytic performance than that of bare BiVO4, single Eu or F doped BiVO4 samples.
