Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 172, Issue 2-3, Pages 1424-1429Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2009.08.008
Keywords
Polyethylene; Goethite; Solid-phase; Photocatalytic degradation
Categories
Funding
- National Natural Science Foundation of China [40371604]
- Sci-tech innovation Foundation of Huazhong Agricultural University [52204-08043]
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A novel photodegradable polyethylene-goethite (PE-goethite) composite film was prepared by embedding the goethite into the commercial polyethylene. The degradation of PE-goethite composite films was investigated under ultraviolet light irradiation. The photodegradation activity of the PE plastic was determined by monitoring its weight loss, scanning electron microscopic (SEM) analysis and FT-IR spectroscopy. The weight of PE-goethite (1 wt%) sample steadily decreased and led to the total 16% reduction in 300h under UV-light intensity for 1 mW/cm(2). Through SEM observation there were some cavities around the goethite powder in the composite films, but there were few changes except some surface chalking phenomenon in pure PE film. The degradation rate could be controlled by changing the concentration of goethite particles in PE plastic. The degradation of composite plastic initiated on PE-goethite interface and then extended into polymer matrix induced by the diffusion of the reactive oxygen species generated on goethite particle surface. The photocatalytic degradation mechanism of the composite films was briefly discussed. (C) 2009 Elsevier B.V. All rights reserved.
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