Microwave-assisted Synthesis And Propertis Of Tungstate, Molybdate And Tungsten Trioxide Nanostructure Materials

Tungstates, molybdates and tungsten trioxide are important functional materials which have been used in various fields, such as in optochromic, laser, electrochromic, photonic device, photocatalysis, gas sensor et al. More and more researchers are interested in the development of tungstates, molybdates and tungsten trioxide, due to their wide foregrounds of development. The interests of researcher in this field is focusing on development of new synthesis method. Microwave-assited synthesis has been introduced into this research due to its advantages of rapid kinetics, high efficiency, energy conservation, pollution-free, and so on. Here, we prepared tungstates, molybdates and tungsten trioxide nanostructure materials by microwave-assisted method. The reactant temperature and reactant time that affected on crystallinity and morphology of these nanostructure materials have been studied, and the PL and photocatalysis properties have been investagted.In the review of part 1, the origin, concepts and properties of nanostructure materials were introduced briefly. And introduced the development of tungstates, molybdates and tungsten trioxide. In addition, our paper briefly introduced the develpoment of microwave chemistry, its application in preparation of nanostructure materials.In the part 2, we have successfully synthesized CdWO4, ZnWO4, BaWO4, CaWO4 nanostructure materials by microwave-assisted method. The product obtained were characterized by using X-ray diffractometer (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), Ultraviolet and visible spectroscopy (UV-Vis) and photoluminescence spectra (PL), respectively. The results showed that the crystallinity and morphology of the products strongly relied on the reactant temperature and reactant time, and the PL properties of the prepared samples was relate to the crystallinity and morphology. The evaluation of photocatalysis activity of ZnWO4 for the photocatalytic decolorization of RhB aqueous solution was performed. The result showed that the activity of photocatalysis was affected by the crystallinity, morphology and surface area.In the part 3, BaMoO4 nanoparticles have been synthesized by microwave-assisted method and Na2MoO4·2H2O and BaCl2 were used as the staring materials. The prepared samples were characterized by using X-ray diffractometer (XRD), scanning electron microscope (SEM) and photoluminescence spectra (PL), respectively. The result suggested that the morphology and crystallinity were related to the rectant time. And the PL property of the product strongly relied on the crystallinity and morphology.In the part 4, WO3·1/3H2O nanoparticles has been synthesized by microwave-assisted method, Na2WO4·2H2O and PdCl2 as the staring materials. The prepared samples were characterized by using X-ray diffractometer (XRD), scanning electron microscope (SEM), photoluminescence spectra (PL) and UV-vis, respectively. The result implied that the morphology and crystallinity were affected by the reactant time and reactant temperture. The evaluation of photocatalysis activity of WO3·1/3H2O for decolorization of RhB aqueous solution was investageted. The result showed that the activity of photocatalysis was related to the crystallinity and surface area.