Abstract
In this paper, V2O5 sol was firstly prepared using vanadyl sulfate as a vanadium source by modified sol–gel method at room temperature. Then flower-like V2O5 powders were prepared by coagulating as-prepared sol with anhydrous ethanol and subsequent annealing crystallization. The X-ray diffraction analysis indicated that V2O5 powders exhibited orthorhombic crystal structure after annealing at 450 °C. The experimental data obtained from both field emission scanning electron microscopy and high-resolution transmission electron microscopy identified that V2O5 powders were approximately flower-like in shape and about 5 μm in size. Besides, the Brunauer–Emmett–Teller specific surface area of flower-like V2O5 powders was 24.25 m2/g. According to Uv–Vis spectroscopy, the degradation rate of toluidine blue O (TBO) on as-prepared flower-like V2O5 powders during 10 h of visible light irradiation with an intensity of 15.4 mW/m2 was 88%, which was faster than those over P25 (46%) as a comparison. In addition, the mineralization process of TBO was investigated, which primarily consisted of demethylation and ring-opening oxidation processes, and confirmed by liquid chromatograph-mass spectrometry. The precipitation–oxidation–peptization, coagulation, and crystallization processes were proposed as the formation mechanism for the preparation of flower-like V2O5.
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This work is supported by the China National Key Research & Development Plan (Grant Nos. 2016YFC0700901, 2016YFC0700607) and project (BZZ14J001).
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Li, Y., Kuang, JL., Lu, Y. et al. Facile Synthesis, Characterization of Flower-Like Vanadium Pentoxide Powders and Their Photocatalytic Behavior. Acta Metall. Sin. (Engl. Lett.) 30, 1017–1026 (2017). https://doi.org/10.1007/s40195-017-0611-6
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DOI: https://doi.org/10.1007/s40195-017-0611-6