Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (05): 585-590. Previous Articles     Next Articles

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  1. (西北师范大学化学化工学院 省部共建生态环境相关高分子材料教育部重点实验室 甘肃省高分子材料重点实验室 兰州 730070)
  • 投稿日期:2010-04-04 修回日期:2010-09-25 发布日期:2010-11-11
  • 通讯作者: 许晶晶
  • 基金资助:


Preparation and Characterization of Ag/TiO2 Hollow Nano-Fiber Photocatalytic Material

XU Jing-Jing, ZHU Ping-Wu, ZHAO Li, SUN Jia-Xing, SU Bi-Tao, LEI Zi-Qiang   

  1. (Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070)
  • Received:2010-04-04 Revised:2010-09-25 Published:2010-11-11

Ag/TiO2 hollow nano-fiber photocatalytic material was successfully synthesized by using cotton fiber as the template. Thermogravimetric analysis (TG), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD), Zeta potential, UV-Vis and IR techniques were employed to characterize the morphology, phase structure and the state of silver. Using the decolorizing degradation of methylene blue (MB) as the model reaction, the photocatalytic property of the material Ag/TiO2 was investigated under different light sources. The results showed that the material not only copied the morphology of cotton fibers but also had negative charges on its surface. The sample showed much better photocatalytic property than pure TiO2 and its activity was higher under the sunlight than under UV irradiation. For example, on the surface of Ag/TiO2 hollow nano-fiber material, the decolorizing efficiency of MB solution was over 95% when irradiation time was 1.5 h under the sunlight while on TiO2, the efficiency was less than 60% when the time was 2.5 h, which was lower than the result of Ag/TiO2 when the time was 0.5 h. However, under UV irradiation, the efficiency was only 35% on the material Ag/TiO2 when the time was 3 h. Its photocatalytic activity didn t basically decrease and the efficiency was kept above 90% when it was repeatedly used for 5 times. The material was easily removed by centrifugal separation and used repeatedly. Therefore, Ag/TiO2 hollow nano-fiber material, synthesized by the template method, is no energy consumption, no pollution, good photocatalytic property and green environment-friendly catalytic material.

Key words: Ag/TiO2, hollow nano-fiber material, preparation, characterization, photocatalytic property