Bi2WO6花瓣状微球的无助剂合成及其光催化性能

Bi(NO3)3o5H2O and Na2WO4o2H2O were used as raw materials, the petal-like Bi2WO6 microspheres were synthesized by no-additive hydrothermal method. Using Rhodamine B（RhB）as a model compound, the effects of the hydrothermal pH value, temperature and time on the photocatalytic activity of the Bi2WO6 was tested。The precursor's pH value is a main factor for the photocatalytic activity of Bi2WO6, the acidic condition was good for the formation of petal-like Bi2WO6 microspheres. It was found that the Bi3.84W0.16O6.24 generated when the precursor solution was alkaline. The as-prepared samples were characterized by X-ray diffraction(XRD), scanning electron microscope (SEM), Brunauer-Emmett-Teller（BET）and UV-vis DRS. The results showed that the product was petal-like Bi2WO6 microspheres with orthorhomibc structure, it had an average diameter of 500nm-3μm and a high specific surface area (27.91m2/g)，The degradation rate(η) of RhB(20mg/L) reached to 100% after 75 minutes lighting with xenon lamp. This showed that the petal-like Bi2WO6 microspheres synthesized by hydrothermal method had an excellent visible light photocatalytic activity.