Enhanced Visible-Light Photocatalytic Performance of Electrospun rGO/TiO2 Composite Nanofibers

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• 作者：Maryline Nasr ; Sébastien Balme ; Cynthia Eid ; Roland Habchi ; Philippe Miele ; Mikhael Bechelany
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：121
• 期：1
• 页码：261-269
• 全文大小：635K
• ISSN：1932-7455

文摘

Reduced graphene oxide (rGO)/titanium dioxide (TiO₂) composite nanofibers as photocatalytic materials were successfully elaborated by using electrospinning. The as-spun nanofibers with controlled ratio of rGO were annealed at 500 °C under nitrogen in a tubular furnace. Structural, morphological, and optical characterizations demonstrate the success of rGO incorporation in the TiO₂ nanofibers. The performances of these nanocomposites for photocatalytic application have been evaluated. The presence of rGO sheets decreases the band gap energy of TiO₂ NFs from 3.2 to 2.9 eV. Hence, in the photodegradation of methyl orange (MO), a significant enhancement in the reaction rate was observed with rGO/TiO₂ (2 wt %) composite NFs compared to commercial TiO₂-P25. In addition, the kinetic of MO degradation by rGO/TiO₂ (2 wt %) composite NFs is 6 times higher than that by commercial TiO₂. Thus, the photocatalytic activity of the composites rGO/TiO₂ significantly increases the visible-light photoresponse and improves the separation of photoinduced electron–hole pairs of TiO₂.