【摘 要】
：
TiO2 nanofibers were obtained from polyacetictitanium (PET) nanofibers by the heat treatment.PET nanofibers, as the precursor, were prepared by electrospinning using tetrabutyl titanate and acetate as
【机 构】
：
State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, J
【出 处】
：
2016’中国溶胶-凝胶学术研讨会暨国际论坛
论文部分内容阅读
TiO2 nanofibers were obtained from polyacetictitanium (PET) nanofibers by the heat treatment.PET nanofibers, as the precursor, were prepared by electrospinning using tetrabutyl titanate and acetate as the raw materials through sol-gel processes [1].Effects of the heat-treated temperature and atmosphere on crystallization,microstructure and photocatalysis of electrospun TiO2 nanofibers were investigated.In air, the TiO2 nanofibers heat-treated to 950 ℃ possessed the highest photocatalytic activity with about 80% methyl orange (MO) degraded within 15 min, because of the mixed phase, low recombination rate of photogenerated carrier and high production of hydroxyl radicals(· OH) on the surface of UV-irradiated samples.However, mesoporous TiO2 nanofibers were obtained in water steam [2].The precursor nanofibers are pretreated in water steam from room temperature to various high temperatures.The samples pretreated to 500 ℃ in water steam possessed higher performance.In order to further investigate the influence of heat-treated temperature on the photocatalytic activity, the pretreated nanofibers to 500 ℃ in water steam were heat-treated to different high temperatures (600, 700, 800, 900 and 1000 ℃) and held at the temperature for 2 h in air subsequently.The TiO2 nanofibers obtained from 600 ℃ to 800 ℃ possessed higher photocatalytic activity, and almost degrade all MO within 15 min.The degradation rate are similar to the standard photocatalyst P25, and better than the samples sintered at 950 ℃ in air without preheating in water steam.The reason was that water steam played an important role in the removal of organic ligands to promote the crystallization and the formation of mesoporous to increase the specific surface area, meanwhile avoiding the collapse of the mesoporous removing template compared to the template synthesized mesoporous TiO2 [3].For the samples heat-treated to 900 ℃ and 1000 ℃, the photocatalytic activity rapidly decreased, which was attributed to the vanishing of anatase phase and the decrease of specific surface area.
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