The magnetically separable ternary polyetherimide/titanate@Fe3O4(PTF) photocatalysts of special heterostructure between magnetite(Fe3O4) microspheres and titanates nanosheets modified by polyetherimide(PEI) were succe...The magnetically separable ternary polyetherimide/titanate@Fe3O4(PTF) photocatalysts of special heterostructure between magnetite(Fe3O4) microspheres and titanates nanosheets modified by polyetherimide(PEI) were successfully fabricated via a simple facile hydrothermal deposition method. The as-prepared photocatalysts were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Transmission electron microscopy and UV-vis diffuse reflectance spectroscopy etc. The results showed that the as-fabricated material had a structure of Fe3O4microspheres coated with titanates nanosheets modified by PEI. The special interfacial contact between 3 D microsphere and 2 D nanosheets in the nanoarchitectures was formed via electrostatic attraction. Furthermore, the resulted photocatalysts were tested by degradation reaction of methylene blue under visible light irradiation and demonstrated an enhanced performance than the pure Fe3O4microspheres, and the photocatalytic activity enhanced with the molar ratio of Fe3O4microspheres and modified titanate gradually, which was attributed to the expansion of the surface area and the different electrostatic contact between the Fe3O4microspheres and titanate nanosheets. Moreover, the obtained results revealed the high yield magnetic separation and efficient reusability of PTF-5(96.7%) over 3 times reuse.展开更多
目的了解镇巴县中小学生视力低下情况及变化趋势,为制定近视防控策略提供依据。方法利用2005、2010、2015、2020年镇巴县健康监测点校中小学生健康监测资料,分析镇巴县15 a 7岁-18岁中小学生视力低下检出情况及变化趋势。结果2005、2010...目的了解镇巴县中小学生视力低下情况及变化趋势,为制定近视防控策略提供依据。方法利用2005、2010、2015、2020年镇巴县健康监测点校中小学生健康监测资料,分析镇巴县15 a 7岁-18岁中小学生视力低下检出情况及变化趋势。结果2005、2010、2015和2020年镇巴县中小学生视力低下检出率分别为43.54%、44.91%、47.86%和50.27%,15a间上升6.73百分点,平均每a增长0.45百分点。视力低下女生高于男生、城镇高于农村,但农村与城镇的差距逐年缩小。结论镇巴县中小学生视力低下增速明显加快。应加强各项防控措施的落实,防止视力低下的发生和发展。展开更多
基金Funded by the National Natural Science Foundation of China(Nos.21103054,21003055,and 50872037)the Open Fund of Fujian Provincial Key Laboratory of Functional Materials and Applications(Xiamen University of Technology)(No.608160030215)the Program for Innovative Research Team in Science and Technology in Fujian Province University(IRTSTFJ)
文摘The magnetically separable ternary polyetherimide/titanate@Fe3O4(PTF) photocatalysts of special heterostructure between magnetite(Fe3O4) microspheres and titanates nanosheets modified by polyetherimide(PEI) were successfully fabricated via a simple facile hydrothermal deposition method. The as-prepared photocatalysts were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Transmission electron microscopy and UV-vis diffuse reflectance spectroscopy etc. The results showed that the as-fabricated material had a structure of Fe3O4microspheres coated with titanates nanosheets modified by PEI. The special interfacial contact between 3 D microsphere and 2 D nanosheets in the nanoarchitectures was formed via electrostatic attraction. Furthermore, the resulted photocatalysts were tested by degradation reaction of methylene blue under visible light irradiation and demonstrated an enhanced performance than the pure Fe3O4microspheres, and the photocatalytic activity enhanced with the molar ratio of Fe3O4microspheres and modified titanate gradually, which was attributed to the expansion of the surface area and the different electrostatic contact between the Fe3O4microspheres and titanate nanosheets. Moreover, the obtained results revealed the high yield magnetic separation and efficient reusability of PTF-5(96.7%) over 3 times reuse.
文摘目的了解镇巴县中小学生视力低下情况及变化趋势,为制定近视防控策略提供依据。方法利用2005、2010、2015、2020年镇巴县健康监测点校中小学生健康监测资料,分析镇巴县15 a 7岁-18岁中小学生视力低下检出情况及变化趋势。结果2005、2010、2015和2020年镇巴县中小学生视力低下检出率分别为43.54%、44.91%、47.86%和50.27%,15a间上升6.73百分点,平均每a增长0.45百分点。视力低下女生高于男生、城镇高于农村,但农村与城镇的差距逐年缩小。结论镇巴县中小学生视力低下增速明显加快。应加强各项防控措施的落实,防止视力低下的发生和发展。
