A series of photocatalysts of un-doped, single-doped and co-doped nanometer titanium diox- ide （TiO2） have been successfully prepared by template method using Fe（NO3）3.9H2O, La（NO3）3.6H2O, and tetrabutyl titanat...A series of photocatalysts of un-doped, single-doped and co-doped nanometer titanium diox- ide （TiO2） have been successfully prepared by template method using Fe（NO3）3.9H2O, La（NO3）3.6H2O, and tetrabutyl titanate as precursors and glucan as template. Scanning electron microscopy, X-ray diffraction, and N2 adsorption-desorption measurement were employed to characterize the morphology, crystal structure and surface structure of the samples. The photo-absorbance of the obtained catalysts was measured by UV-Vis absorption spectroscopy, and the photocatalytic activities of the prepared samples under UV and visible light were estimated by measuring the degradation rate of methyl orange in an aqueous solution. The characterizations indicated that the prepared photocatalysts consisted of anatase phase and possessed high surface area of ca. 163-176 m2/g. It was shown that the Fe and La co-doped nano-TiO2 could be activated by visible light and could thus be used as an effective catalyst in photo-oxidation reactions. The synergistic effect of Fe and La co-doping played an important role in improving the photocatalytic activity. In addition, the possibility of cyclic usage of co-doped nano-TiO2 was also confirmed, the photocatalytic activity of codoped nano-TiO2 remained above 89.6% of the fresh sample after being used four times.展开更多
Fe-La, Fe-Ce, Fe-La-P, Fe-Ce-P and Fe-P alloys were obtained f rom aqueous solutions by using optimized electroplaing solutions and process con ditions. The experimental results show that these alloys (Fe-La-P, Fe-Ce-...Fe-La, Fe-Ce, Fe-La-P, Fe-Ce-P and Fe-P alloys were obtained f rom aqueous solutions by using optimized electroplaing solutions and process con ditions. The experimental results show that these alloys (Fe-La-P, Fe-Ce- P and Fe-P) have amorphous structure. The crystallization activation energy a nd kinetics equation of three kinds amorphous coatings have been determined by D SC method. The results indicated that the crystallization activation energy of F e-P, Fe-La-P, Fe-Ce-P amorphous coatings are 175.2, 370.1, 434.6kJ·m ol-1 respectively. The crystallization mechamism of three kinds amorphous alloy s may be expressed by Avrami-Erofeev equation (n=1), the kinetics equation is .展开更多
文摘A series of photocatalysts of un-doped, single-doped and co-doped nanometer titanium diox- ide （TiO2） have been successfully prepared by template method using Fe（NO3）3.9H2O, La（NO3）3.6H2O, and tetrabutyl titanate as precursors and glucan as template. Scanning electron microscopy, X-ray diffraction, and N2 adsorption-desorption measurement were employed to characterize the morphology, crystal structure and surface structure of the samples. The photo-absorbance of the obtained catalysts was measured by UV-Vis absorption spectroscopy, and the photocatalytic activities of the prepared samples under UV and visible light were estimated by measuring the degradation rate of methyl orange in an aqueous solution. The characterizations indicated that the prepared photocatalysts consisted of anatase phase and possessed high surface area of ca. 163-176 m2/g. It was shown that the Fe and La co-doped nano-TiO2 could be activated by visible light and could thus be used as an effective catalyst in photo-oxidation reactions. The synergistic effect of Fe and La co-doping played an important role in improving the photocatalytic activity. In addition, the possibility of cyclic usage of co-doped nano-TiO2 was also confirmed, the photocatalytic activity of codoped nano-TiO2 remained above 89.6% of the fresh sample after being used four times.
文摘Fe-La, Fe-Ce, Fe-La-P, Fe-Ce-P and Fe-P alloys were obtained f rom aqueous solutions by using optimized electroplaing solutions and process con ditions. The experimental results show that these alloys (Fe-La-P, Fe-Ce- P and Fe-P) have amorphous structure. The crystallization activation energy a nd kinetics equation of three kinds amorphous coatings have been determined by D SC method. The results indicated that the crystallization activation energy of F e-P, Fe-La-P, Fe-Ce-P amorphous coatings are 175.2, 370.1, 434.6kJ·m ol-1 respectively. The crystallization mechamism of three kinds amorphous alloy s may be expressed by Avrami-Erofeev equation (n=1), the kinetics equation is .
