A series of Sr1-1.5xYxTiO3（x = 0-12） solid solutions were synthesized by a solid state reaction process.The effects of reaction temperature and dopant on the crystallinity,microstructure and morphology of Sr1-1.5xYx...A series of Sr1-1.5xYxTiO3（x = 0-12） solid solutions were synthesized by a solid state reaction process.The effects of reaction temperature and dopant on the crystallinity,microstructure and morphology of Sr1-1.5xYxTiO3（x=0-0.12） were investigated.Pure and single-phase perovskite-type Sr1-1.5xYxTiO3（x0.08） solid solutions were obtained at 1 400 ℃ for 6 h.The perovskite-type SrTiO3 and pyrochlore-phase Y2Ti2O7 coexisted for x = 0.08-0.12,leading to an unstable and unfavourable solid solution structure for long-term immobilization of the 90Sr.The X-ray diffraction patterns for Rietveld refinement analysis confirmed the formation of a Sr1-1.5xYxTiO3（x = 0-0.12） continuous solid solution.Stretching and bending vibrations were assigned in the infrared region.The SrTiO3 grain size increased with Y content.The leaching behavior of Y^3＋ from the waste forms of Sr1-1.5xYxTiO3 was controlled by its structural change.展开更多
WO3 nanowires were fabricated by a hydrothermal method,which proceeded at 170 ℃ for 48 h in a solution containing C2H10N6H2SO4 as a dispersant and Na2WO4 as a starting material.The nanowires exhibit a well crystalliz...WO3 nanowires were fabricated by a hydrothermal method,which proceeded at 170 ℃ for 48 h in a solution containing C2H10N6H2SO4 as a dispersant and Na2WO4 as a starting material.The nanowires exhibit a well crystallized one-dimensional structure with 20 nm in diameter and several microns in length.The physicochemical properties of WO3 were compared using X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,energy dispersive X-ray spectroscopy（EDX） and UV-vis spectroscopy（UV-Vis）.The photoactivity of the as-perpared WO3 nanowires was evaluated through the photodegradation of methylene blue（MB） in aqueous solution.The experimental results demonstrate that addition of C2H10N6H2SO4 salt in the WO3 nanowires synthesis process can enhance its photocatalytic activity obviously.展开更多
基金Funded by the National Natural Science Foundation of China(No.21501159)
文摘A series of Sr1-1.5xYxTiO3（x = 0-12） solid solutions were synthesized by a solid state reaction process.The effects of reaction temperature and dopant on the crystallinity,microstructure and morphology of Sr1-1.5xYxTiO3（x=0-0.12） were investigated.Pure and single-phase perovskite-type Sr1-1.5xYxTiO3（x0.08） solid solutions were obtained at 1 400 ℃ for 6 h.The perovskite-type SrTiO3 and pyrochlore-phase Y2Ti2O7 coexisted for x = 0.08-0.12,leading to an unstable and unfavourable solid solution structure for long-term immobilization of the 90Sr.The X-ray diffraction patterns for Rietveld refinement analysis confirmed the formation of a Sr1-1.5xYxTiO3（x = 0-0.12） continuous solid solution.Stretching and bending vibrations were assigned in the infrared region.The SrTiO3 grain size increased with Y content.The leaching behavior of Y^3＋ from the waste forms of Sr1-1.5xYxTiO3 was controlled by its structural change.
基金Funded by the National Natural Science Foundation of China(No.21501159)
文摘WO3 nanowires were fabricated by a hydrothermal method,which proceeded at 170 ℃ for 48 h in a solution containing C2H10N6H2SO4 as a dispersant and Na2WO4 as a starting material.The nanowires exhibit a well crystallized one-dimensional structure with 20 nm in diameter and several microns in length.The physicochemical properties of WO3 were compared using X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,energy dispersive X-ray spectroscopy（EDX） and UV-vis spectroscopy（UV-Vis）.The photoactivity of the as-perpared WO3 nanowires was evaluated through the photodegradation of methylene blue（MB） in aqueous solution.The experimental results demonstrate that addition of C2H10N6H2SO4 salt in the WO3 nanowires synthesis process can enhance its photocatalytic activity obviously.
