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Synthesis and Properties of Tungsten Oxide Nanoparticles

Author: LiYaNi
Tutor: WangJiDe；SuXinTai
School: Xinjiang University
Course: Chemical Engineering and Technology
Keywords: Nanomaterials Tungsten trioxide Gas Photocatalytic
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 289
Quote: 0
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Abstract


WO3 is an n-type semiconductor, is a transition metal oxide, in which the band gap of between 2.5-3.5eV, is a wide band gap semiconductor oxide. It is in gas sensors, photocatalysis, monitors, and other aspects of the electrode material is widely used, is one of the materials with potential for development. As we all know, the performance of nano-materials and their size and morphology have a great relationship, therefore, the structure and morphology of different tungsten trioxide preparation and study its performance has always been people's attention. This thesis is the use of different auxiliary reagents, under the control of hydrothermal synthesis of different morphologies and phase nano tungsten trioxide powder, and its reaction mechanism was discussed. Using X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) by means of products were characterized. As an n-type semiconductor photocatalyst there are many different TiO2, ZnO, Fe2O3, CdS and WO3, etc. WO3 and TiO2 have equal and similar bandgap energy band structure, and its photocatalytic stability, photocatalytic degradation of pollutants are also ideal catalytic effect; typical of gas sensors mainly refers SnO2, ZnO and TiO2 and other sensitive material. Recently, it was found that tungsten trioxide is a well-sensitive material, experiments show it to some oxidizing gases and reducing gases have a high sensitivity. In this paper, the synthesis gas tungsten trioxide and photocatalytic performance to do the research. The main results and conclusions are as follows: (a) under hydrothermal conditions with different adjuvants aid were obtained Quartet, sheet, rod and spherical tungsten oxide nanoparticles. XRD analysis shows that the product obtained by means of a hexagonal, tetragonal or monoclinic WO3; can be observed by SEM and TEM, the morphology structure and its size. The results show that the morphology of the sample adjuvants have a great impact. (2) morphology of nano tungsten trioxide gas has an important impact on performance. In this article, the main study the tungsten trioxide powder prepared in ethanol and acetone gas sensor sensitivity of the gas, the results showed that: the sample at different temperature and different gas concentrations both ethanol and acetone gas-sensitive characteristics of different morphologies sensing properties of tungsten trioxide vary. This may be ethanol or acetone with WO3 nanoparticles surface adsorbed oxygen from air to form oxygen ions react to the release of the trapped electrons, the resistance of the material is reduced. (3) morphology of nano-photocatalytic properties of tungsten trioxide also has important implications. In this paper, methylene blue as model pollutant effects of different morphologies of tungsten trioxide as a photocatalyst for methylene blue photocatalytic degradation efficiency; and select photocatalytic works best with a hollow structure of tungsten oxide as catalyst, studied its gasoline spent caustic wastewater photocatalytic effect. Experimental results show that different morphologies of nano-tungsten trioxide of methylene blue light photocatalytic degradation have different effects on the photocatalytic gasoline spent caustic wastewater treatment, has a hollow structure of nano-tungsten trioxide show better photocatalytic effect .

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