A series of carbon nanotubes/TiO2 nanotubes （CNTs/TNTs） composite photocatalysts were successfully prepared by incorporation of CNTs in HNO3 washing process. These photocatalysts were characterized by XRD, N2 physic...A series of carbon nanotubes/TiO2 nanotubes （CNTs/TNTs） composite photocatalysts were successfully prepared by incorporation of CNTs in HNO3 washing process. These photocatalysts were characterized by XRD, N2 physical adsorption, UV-vis diffuse reflectance spectroscopy, TEM and Raman spectroscopy, respectively, and their photocatalytic activities were tested by using methyl orange （MO） as a model compound. Also, the effects of amount of CNTs incorporated, calcination temperature and amount of catalyst on the photocatalytic activity of the composite photocatalyst were systematically investigated. The results show that the CNTs/TNTs composite exhibits much higher photocatalytic activity than that of the TNTs or CNTs alone.展开更多
Nanosized hollow silica spheres with average diameters from 43 to 70 nm were prepared by removal of Fe3O4 templates with hydrochloric acid from silica-coated Fe3O4 core-shell composites. The shells of the hollow silic...Nanosized hollow silica spheres with average diameters from 43 to 70 nm were prepared by removal of Fe3O4 templates with hydrochloric acid from silica-coated Fe3O4 core-shell composites. The shells of the hollow silica spheres had nanopores with average diameters of 0.92-1.25 nm. When the silica-coated Fe3O4 core-shell composites were prepared at a high pH value or with a low mole ratio of Na2SiO3 to Fe3O4, the resulting hollow silica spheres consisted of highly porous shells. When the silica-coated Fe3O4 core-shell composites were prepared with a high mole ratio of Na2SiO3 to Fe3O4, the resulting hollow silica spheres had large diameters and thick shells. The release rate of herbicide, ammonium glyphosate, could be tuned by using hollow silica spheres with different shell thicknesses.展开更多
A new kind of nonmetallic nanosensors based on surface-enhanced Raman spectroscopy(SERS)have been successfully prepared by the assembly of α-Fe_(2)O_(3) nanoparticles(NPs)onto clean quartz surface via the cross-linke...A new kind of nonmetallic nanosensors based on surface-enhanced Raman spectroscopy(SERS)have been successfully prepared by the assembly of α-Fe_(2)O_(3) nanoparticles(NPs)onto clean quartz surface via the cross-linker of hexamethylene diisocyanate(HDI).The resultant substrates have been characterized by electron micrographs,which show that the α-Fe_(2)O_(3) NPs distribute on the modified surface uniformly with a monolayer or sub-monolayer structure.4-mercaptopyridine(4-Mpy)and 2-mercaptobenzothiazole(2-MBT)molecules have been used as SERS probes to estimate the detection efficiency of the α-Fe_(2)O_(3) thin films.The SERS experiments show that it is possible to record high quality SERS spectra from probe molecules on the α-Fe_(2)O_(3) thin films at sub-micromolar(<10^(–6) mol/L)concentration.These results indicate that the highly ordered,uniformly roughed,highly sensitive and low-cost α-Fe_(2)O_(3) thin films are excellent candidates for nonmetallic SERS-active nanosensors.展开更多
基金Financial supports from the Project Supported by the Natural Science Foundation of the Jiangsu Province Higher Education Institutions of China(09KJD150002)Project Supported by the Graduate Innovation Program Foundation of the Jiangsu Province Higher Education Institutions of China(CXLX_0570)
文摘A series of carbon nanotubes/TiO2 nanotubes （CNTs/TNTs） composite photocatalysts were successfully prepared by incorporation of CNTs in HNO3 washing process. These photocatalysts were characterized by XRD, N2 physical adsorption, UV-vis diffuse reflectance spectroscopy, TEM and Raman spectroscopy, respectively, and their photocatalytic activities were tested by using methyl orange （MO） as a model compound. Also, the effects of amount of CNTs incorporated, calcination temperature and amount of catalyst on the photocatalytic activity of the composite photocatalyst were systematically investigated. The results show that the CNTs/TNTs composite exhibits much higher photocatalytic activity than that of the TNTs or CNTs alone.
基金financially supported by research funds from Zhenjiang Science and Technology Bureau (GJ2006006)
文摘Nanosized hollow silica spheres with average diameters from 43 to 70 nm were prepared by removal of Fe3O4 templates with hydrochloric acid from silica-coated Fe3O4 core-shell composites. The shells of the hollow silica spheres had nanopores with average diameters of 0.92-1.25 nm. When the silica-coated Fe3O4 core-shell composites were prepared at a high pH value or with a low mole ratio of Na2SiO3 to Fe3O4, the resulting hollow silica spheres consisted of highly porous shells. When the silica-coated Fe3O4 core-shell composites were prepared with a high mole ratio of Na2SiO3 to Fe3O4, the resulting hollow silica spheres had large diameters and thick shells. The release rate of herbicide, ammonium glyphosate, could be tuned by using hollow silica spheres with different shell thicknesses.
基金This work was supported by the Natural Science Foundation of Jiangsu Higher Education Institutions of China(No.09KJD150002)Zhenjiang Science and Technology Bureau(No.GJ2006006)Jiangsu University High-grade Specialty Person Scientific Research Foundation(No.10JDG114).
文摘A new kind of nonmetallic nanosensors based on surface-enhanced Raman spectroscopy(SERS)have been successfully prepared by the assembly of α-Fe_(2)O_(3) nanoparticles(NPs)onto clean quartz surface via the cross-linker of hexamethylene diisocyanate(HDI).The resultant substrates have been characterized by electron micrographs,which show that the α-Fe_(2)O_(3) NPs distribute on the modified surface uniformly with a monolayer or sub-monolayer structure.4-mercaptopyridine(4-Mpy)and 2-mercaptobenzothiazole(2-MBT)molecules have been used as SERS probes to estimate the detection efficiency of the α-Fe_(2)O_(3) thin films.The SERS experiments show that it is possible to record high quality SERS spectra from probe molecules on the α-Fe_(2)O_(3) thin films at sub-micromolar(<10^(–6) mol/L)concentration.These results indicate that the highly ordered,uniformly roughed,highly sensitive and low-cost α-Fe_(2)O_(3) thin films are excellent candidates for nonmetallic SERS-active nanosensors.
