Tuning Fluorescence Characterization And Catalyst Design Based On Nano/Micro Composites

Functional nanocomposite materials, by the use of a special light, electricity, sound, heat, magnetic properties etc, have been occupy an important position in the whole nanocomposite materials. The fluorescence and catalytic properties of nano/micro-composites structure materials have much practical significance in the degradation of organic pollutants, cleaning up the environment, exploring new energy sources. Therefore, the preparation of new functional nanocomposite photocatalysis material is one with a value of basic research and application prospects of an important issue. For the research fields, we prepared of different core-shell structure of the oxides, metal-doped silica microspheres, rare earth oxides, metal and metal salts complex.(1) The sol - gel method was taken to preparation of core-shell structure of the different oxides in nanocomposites. In particular, the rare earth metal europium has been adopted as a shell. The polystyrene, zinc oxide and yttrium oxide were to be used for nuclear. The core-shell morphology was characterized, tested their fluorescence properties through fluorescence spectrometer. The results showed that the changes of structure had not particularly significant impact in the fluorescence properties or intensity.(2) The sol - gel method was taken to preparation of different metal-doped silica spheres. The morphology was characterized, testing its fluorescence properties through fluorescence spectrometer. Because of different metals have different fluorescence properties. The fluorescent of silica microspheres will make it obvious change by doping different metals. The silica microspheres we synthesized gave off a near-infrared emission with the near-infrared excitation. But the doping spheres still maintain the characteristics of silica microspheres. Simultaneously, we proved that the same amount of different types of metals will not change its fluorescent properties.(3) We prepared yttria was possessed of fluorescent properties through a typical method. The morphology was characterized and the fluorescence property was monitored by fluorescence spectrometer. The results found that yttria had a very good red and blue fluorescence, but photocatalytic effect was not very good.(4) Design an efficient photocatalyst with silver salts. Ag@Ag salts were synthesized via solid-phase reaction at room temperature. The morphology was characterized. Their strength of photocatalytic ability was tested through the UV-VIS spectrometer. The mechanism of catalytic effect was discussed.We used scanning electron microscopy (SEM), fluorescence spectrometer (PL), UV—visible spectroscopy (UV-VIS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy etc to detect the product in terms of morphology, structure, fluorescent properties, UV absorption properties etc.