Petal-Like Bi2WO6 Microspheres from No-additive Synthesis and Its Photocatalytic Performance
1. Department of Applied Chemistry, Xi'an University of Technology, Xi’an 710054,China；2. Department of CivilEngineering, University of Arkansas, Fayetteville 72701, USA
Abstract：The petal-like Bi2WO6 microspheres were synthesized by no-additive hydrothermal method from raw materials Bi(NO3)3·5H2O and Na2WO4·2H2O. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS) and N2 adsorption-desorption isotherms. With Rhodamine B（RhB）as a model degradation compound, the effects of precursor pH value, reaction temperature and time on the photocatalytic activity of Bi2WO6 microspheres were investigated. The results showed that the precursor pH value was the main factor for the photocatalytic activity of Bi2WO6 microspheres. An acidic precursor favors for the formation of petal-like Bi2WO6 microspheres, while an alkaline precursor could form the impurity of Bi3.84W0.16O6.24. Under the optimum hydrothermal reaction conditions of the precursor solution pH value 0.5, the reaction temperature 150 ℃ and the reaction time 24 h, the synthetic Bi2WO6 microspheres exhibited an orthorhombic structure and possessed the petal-like morphology with diameters of 500 nm-3 μm, average pore size of 18.9 nm, and specific surface area of 27.9 m2/g. Under the irradiation of a 150 W Xenon lamp, after 75 minutes, the degradation of 20 mg/L RhB could reach up to 100%, indicating that the petal-like Bi2WO6 microspheres had an excellent photocatalytic activity to the visible light.
Yao Binghua 1,Wang Lianjun 1,Zhang Wen 2 et al. Petal-Like Bi2WO6 Microspheres from No-additive Synthesis and Its Photocatalytic Performance[J]. 化学反应工程与工艺, 2013, 29(2): 134-139.
