Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (06): 607-611.doi: 10.3866/PKU.WHXB20050606

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Degradation of Polyethylene Film by Fe3+/TiO2 Photocatalyst

XIONG Yu-hua; LI Feng-yi   

  1. School of Material Science and Engineering, Nanchang University, Nanchang 330047; Institute of Applied Chemistry, Nanchang University, Nanchang 330047
  • Received:2004-10-25 Revised:2004-12-10 Published:2005-06-15
  • Contact: LI Feng-yi E-mail:xyh-nc@163.com

Abstract: Nano-sized TiO2 doped with different percentage of Fe3+was prepared quickly by sol-gel process and was first used as photocatalyst to degrade polyethylene(PE) film under UV (intensity of 60 W) irradiation for 240 h in the ambient air. Some properties of photocatalysts and PE films were characterized by the means of XRD, FT-IR and SEM. The results claimed that PE lost only 8.43%(w) of its mass under UV irradiation for 240 h, anatase TiO2 made PE film lost 30.66%(w). 0.5% Fe2O3/TiO2, 1.0%Fe2O3/TiO2 and 2.0% Fe2O3/TiO2 made PE lost their weights 35.91%(w), 20.72%(w), and 13.30%(w), respectively. Photocatalysts speeded the PE macromolecular chains scission and photo oxidation. SEM morphology of PE film after photodegradation showed that there were numerous pits and holes in the film. The XRD patterns indicated that products contained more wax in PE film than that in PE film without photocatalysts. There was an optimal content of doping Fe3+ in anatase TiO2. 0.5%Fe2O3/TiO2 had a higher activity in photdegradation of PE film than other TiO2 photocatalysts.

Key words: Nano-sized TiO2, Fe3+ doping, Polyethylene film, Photocatalysis degradation reaction in solid-phase