The photosystem Ⅱ(PSⅡ) particles were purified by means of nano-anatase TiO_2 treatment of spinach and studied by spectroscopy. The results show that the electron transport and the oxygen-evolving rate of PSⅡ are a...The photosystem Ⅱ(PSⅡ) particles were purified by means of nano-anatase TiO_2 treatment of spinach and studied by spectroscopy. The results show that the electron transport and the oxygen-evolving rate of PSⅡ are accelerated after it has been treated with nano-anatase TiO_2; the UV-Vis absorption spectrum of PSⅡ particles is increased; the red shift of fluorescence emission peak of PSⅡ is 2 nm; the peak intensity is decreased; the PSⅡ signal Ⅱs of low temperature electron paramagnetic resonanace(EPR) spectrum is intensified under light, and the PSⅡ circular dichroism(CD) spectrum is similar to that of control. It is suggested that nano-anatase TiO_2 might bind to the PSⅡ reaction center complex and intensify the function of the PSⅡ electron donor, however, nano-anatase TiO_2 treatment does not change the configuration of the PSⅡ reaction center complex.展开更多
Using nano-anatase TiO_2 powder and Ce(NO_3)_3 as raw materials Ce-loaded nano-TiO_2 was prepared by impregnating method, and characterized by XRD, TEM and UV-Vis spectrophotometer. The UV-Vis reflective spectra of na...Using nano-anatase TiO_2 powder and Ce(NO_3)_3 as raw materials Ce-loaded nano-TiO_2 was prepared by impregnating method, and characterized by XRD, TEM and UV-Vis spectrophotometer. The UV-Vis reflective spectra of nano-TiO_2 and Ce-loaded nano-TiO_2 were compared. The result shows that Ce-loaded nano-TiO_2 is still of anatase structure with Ce distributing uniformly on nano-TiO_2 surface. A red shift is observed in the UV-Vis adsorption spectrum with its mechanism being discussed.展开更多
文摘The photosystem Ⅱ(PSⅡ) particles were purified by means of nano-anatase TiO_2 treatment of spinach and studied by spectroscopy. The results show that the electron transport and the oxygen-evolving rate of PSⅡ are accelerated after it has been treated with nano-anatase TiO_2; the UV-Vis absorption spectrum of PSⅡ particles is increased; the red shift of fluorescence emission peak of PSⅡ is 2 nm; the peak intensity is decreased; the PSⅡ signal Ⅱs of low temperature electron paramagnetic resonanace(EPR) spectrum is intensified under light, and the PSⅡ circular dichroism(CD) spectrum is similar to that of control. It is suggested that nano-anatase TiO_2 might bind to the PSⅡ reaction center complex and intensify the function of the PSⅡ electron donor, however, nano-anatase TiO_2 treatment does not change the configuration of the PSⅡ reaction center complex.
文摘Using nano-anatase TiO_2 powder and Ce(NO_3)_3 as raw materials Ce-loaded nano-TiO_2 was prepared by impregnating method, and characterized by XRD, TEM and UV-Vis spectrophotometer. The UV-Vis reflective spectra of nano-TiO_2 and Ce-loaded nano-TiO_2 were compared. The result shows that Ce-loaded nano-TiO_2 is still of anatase structure with Ce distributing uniformly on nano-TiO_2 surface. A red shift is observed in the UV-Vis adsorption spectrum with its mechanism being discussed.
