Fluorine-doped TiO2 sol（F-TiO2） was prepared by the modified precipitation-sol-hydrothermal crystallization method with TiCl4 as precursor.The influences of F doping, temperature and time of hydrothermal crystalliza...Fluorine-doped TiO2 sol（F-TiO2） was prepared by the modified precipitation-sol-hydrothermal crystallization method with TiCl4 as precursor.The influences of F doping, temperature and time of hydrothermal crystallization, medium pH value on the morphology and crystallization were studied.The particle size and structure of the prepared F-TiO2 sol as well as the interaction of F with TiO2 were characterized with XRD, UV-Vis-DRS, TEM, TG-DTA, FTIR and XPS.The results showed that F-TiO2 particles in sol were spherical, and partly crystallized to anatase.They were dispersed in the aqueous medium uniformly and showed narrow particle size distribution.The average particle size was 6.5 nm as calculated from XRD and TEM results.It was also shown that fluorine atoms were adsorbed by TiO2 sol particles in two forms.One was physically adsorbed on the surface of TiO2, and the other was embedded into TiO2 crystal lattice.It was found that the addition of fluorine could improve the crystallization of particle significantly, decrease the temperature and shorten the time of hydrothermal crystallization.The adsorption capacity, surface acidity and the photocatalytic activity for decomposition of Rhodamine B were enhanced remarkably with the doping of fluorine.The mechanism of improvement of the photocatalytic activity and structure of TiO2 by fluorine was discussed.展开更多
In recent years Copper-64 in the chemical form of copper chloride ([64Cu]CuCl2) has been identified as a potential agent for PET imaging and radionuclide therapy. The aim of this research was to determine the biodistr...In recent years Copper-64 in the chemical form of copper chloride ([64Cu]CuCl2) has been identified as a potential agent for PET imaging and radionuclide therapy. The aim of this research was to determine the biodistribution and the labeling of radio nanoparticle with 64CuCl2, the nanoparticles Cu(acac)2/F-TiO2 were mixed with 64CuCl2 (20-37 MBq), then the final solution was used to injected healthy Wistar rats to probe the absorption of nanoparticle inside tissue trough of the groups OH that are formed during the functionalization of the Cu(acac)2/F-TiO2. The “in vivo” evaluation after realize the images study in micro PET equipment, uptake of the radio-nanoparticle was observed in the digestive system in the healthy Wistar rats.展开更多
A series of Co/TiO2 catalysts were prepared by incipient wetness impregnation. The pH value of the impregnation solution was adjusted by using nitric acid and urea. The XRD, TPR and XPS characterization results indica...A series of Co/TiO2 catalysts were prepared by incipient wetness impregnation. The pH value of the impregnation solution was adjusted by using nitric acid and urea. The XRD, TPR and XPS characterization results indicate that the change of the pH value of the impregnation solution is correlated with the crystal particle size of cobalt oxide species （Co3O）, dispersion behavior and metal-support interaction. When the pH value of the solution is higher than the IEP （ion equipotential point） of titania, the larger Co3O4 particle size could be obtained on the surface of the catalyst. High pH value favores the adsorption and dispersion of active cobalt species over the titanium dioxide, and facilitates the interaction between cobalt and titania, and depresses the reduction degree of the catalyst. In the F-T reaction, catalysts prepared at high pH value have low activities and high methane selectivities. When the pH value of the solution is lower than the IEP of titania, the Co3O4 particle size is small, the interactions between cobalt species and support are weak and the reduction degrees are high, which further enhance the F-T reaction activity and suppress methane selectivity.展开更多
文摘Fluorine-doped TiO2 sol（F-TiO2） was prepared by the modified precipitation-sol-hydrothermal crystallization method with TiCl4 as precursor.The influences of F doping, temperature and time of hydrothermal crystallization, medium pH value on the morphology and crystallization were studied.The particle size and structure of the prepared F-TiO2 sol as well as the interaction of F with TiO2 were characterized with XRD, UV-Vis-DRS, TEM, TG-DTA, FTIR and XPS.The results showed that F-TiO2 particles in sol were spherical, and partly crystallized to anatase.They were dispersed in the aqueous medium uniformly and showed narrow particle size distribution.The average particle size was 6.5 nm as calculated from XRD and TEM results.It was also shown that fluorine atoms were adsorbed by TiO2 sol particles in two forms.One was physically adsorbed on the surface of TiO2, and the other was embedded into TiO2 crystal lattice.It was found that the addition of fluorine could improve the crystallization of particle significantly, decrease the temperature and shorten the time of hydrothermal crystallization.The adsorption capacity, surface acidity and the photocatalytic activity for decomposition of Rhodamine B were enhanced remarkably with the doping of fluorine.The mechanism of improvement of the photocatalytic activity and structure of TiO2 by fluorine was discussed.
文摘In recent years Copper-64 in the chemical form of copper chloride ([64Cu]CuCl2) has been identified as a potential agent for PET imaging and radionuclide therapy. The aim of this research was to determine the biodistribution and the labeling of radio nanoparticle with 64CuCl2, the nanoparticles Cu(acac)2/F-TiO2 were mixed with 64CuCl2 (20-37 MBq), then the final solution was used to injected healthy Wistar rats to probe the absorption of nanoparticle inside tissue trough of the groups OH that are formed during the functionalization of the Cu(acac)2/F-TiO2. The “in vivo” evaluation after realize the images study in micro PET equipment, uptake of the radio-nanoparticle was observed in the digestive system in the healthy Wistar rats.
文摘A series of Co/TiO2 catalysts were prepared by incipient wetness impregnation. The pH value of the impregnation solution was adjusted by using nitric acid and urea. The XRD, TPR and XPS characterization results indicate that the change of the pH value of the impregnation solution is correlated with the crystal particle size of cobalt oxide species （Co3O）, dispersion behavior and metal-support interaction. When the pH value of the solution is higher than the IEP （ion equipotential point） of titania, the larger Co3O4 particle size could be obtained on the surface of the catalyst. High pH value favores the adsorption and dispersion of active cobalt species over the titanium dioxide, and facilitates the interaction between cobalt and titania, and depresses the reduction degree of the catalyst. In the F-T reaction, catalysts prepared at high pH value have low activities and high methane selectivities. When the pH value of the solution is lower than the IEP of titania, the Co3O4 particle size is small, the interactions between cobalt species and support are weak and the reduction degrees are high, which further enhance the F-T reaction activity and suppress methane selectivity.
