期刊
EXPRESS POLYMER LETTERS
卷 11, 期 11, 页码 899-909出版社
BUDAPEST UNIV TECHNOL & ECON
DOI: 10.3144/expresspolymlett.2017.86
关键词
polymer composites; TiO2/LDPE; TiO2/HDPE; photocatalytic activity; visible light
资金
- CONICYT through FONDECYT [3140536, 3150631, 3150101]
- Universidad Nacional of Colombia
- ITM [P13146]
- CONICYT/FONDAP-Chile [15110019/SERC]
- Austrian Science Fund (FWF) [P13146] Funding Source: Austrian Science Fund (FWF)
This paper reports on the photocatalytic activity showed by nanocomposites of TiO2 with low density polyethylene (LDPE) and high density polyethylene (HDPE) (10, 20 wt%) for the degradation of methyl orange in aqueous medium under visible light irradiation. TiO2 was synthetized by sol-gel process, and the polymers were incorporated by impregnation. Both the pure TiO2 and the nanocomposites were characterized using different physico-chemical techniques including specific surface area analysis, X-ray diffraction analysis, transmission electron microscopy, ultraviolet-visible and photoluminescence spectroscopy, and X-ray photoelectron spectroscopy. All the prepared nanocomposites showed an absorption edge in the visible region. TiO2(90)/LDPE photocatalyst showed the best degradation efficiency after 180 minutes of reaction, without notorious decrease of degradation efficiency after three consecutive uses. Photoluminescence and X-ray photoelectron spectroscopy analyses suggested the presence of vacancies in the TiO2 structure promoted by a Ti-O-C interaction being responsible for the photocatalytic activity enhancement under visible light irradiation.
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