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Synthesis, Characterization and Catalytic Properties of Vanadium Oxide Nanomaterials

Author: ZengQiuMei
Tutor: HuangKaiXun
School: Huazhong University of Science and Technology
Course: Inorganic Chemistry
Keywords: Nanomaterials Vanadium oxide Catalytic degradation Hydrothermal method
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 35
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Abstract


The preparation of novel morphology and has excellent performance nanomaterials is a hot area of ??nanomaterials research. Hydrothermal method, hydrothermal / solvothermal synthesis with different morphologies vanadium and copper mine Cu 0.85 V 2 O 5 Water vanadium copper Cu 3 V 2 O (OH) 2.2 H 2 O composite nanomaterials, the metastable state V 10 O 2 412 H in 2 O nanostructures its burning into V 2 O 5 nanoparticles and CdS semiconductor materials, field emission scanning electron microscope (FE-SEM), X-ray diffraction analyzer (XRD), X-ray photoelectron spectrometer ( XPS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-visible spectroscopy (UV-vis) were characterized by means of the resulting product, the main results are as follows: (1) application of citric acid as hats reagents using a simple hydrothermal method successfully synthesized by vanadium and copper mine Cu0.85V 2 the O 5 and water vanadium copper Cu 3 V 2 O 7 (OH) 2.2 H 2 O consisting of a \oxide nanomaterials. The results show that the the copper vanadium ratio and reaction time are the substance of the final product phase composition and morphology. The composite nanomaterials strong catalytic degradation of methylene blue MB degradation rate reached 83.6% in just five minutes, and with good structural stability and excellent reusability. Added in an amount of the catalyst, the initial concentration of the MB solution, the pH value of the MB solution, the reaction temperature, the presence or absence of oxygen, the composition of the catalyst itself has a very important influence on the entire catalytic process. (2) using a commercially available vanadium pentoxide (V 2 O 5 ) as a precursor, in the polyvinyl pyrrolidone (PVP) and hydrogen peroxide (H 2 O 2 ) together, won by a simple hydrothermal reaction of porous spherical monoclinic phase V10O 2 4.12 H 2 O nanocrystals. Burning, the nanocrystals can be very easily converted to tetragonal phase V 2 O 5 nano-particles by oxidation in a muffle furnace. Time experiments, we discuss the possible growth mechanism. The application of cyclic voltammetry (CV) and compared the electrochemical properties of the two, both photocatalytic properties. (3) S to elemental sulfur and cadmium acetate, as the reaction raw material, as a mixed solvent of water and ethylene glycol (EG), to react at 180 ° C hydrothermally / solvent heat for 12 h, synthesized by a hexagonal rod consisting of flower-like CdS nanomaterials explore the reaction time, reaction temperature, EG volume ratio and reaction molar ratio of the raw material on the morphology and crystal growth mechanism, and to study its photocatalytic properties.

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