Enhanced visible-light photocatalytic activity of g-C₃N₄/TiO₂ films

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• 作者：Natkritta Boonprakob ; Natda Wetchakun ; Sukon Phanichphant ; David Waxler ; Peter Sherrell ; Andrew Nattestad ; Jun Chen ; Burapat Inceesungvorn
• 关键词：Titanium dioxide ; Graphitic carbon nitride ; Photocatalysis ; Visible light
• 刊名：Journal of Colloid and Interface Science
• 出版年：1 March, 2014
• 年：2014
• 卷：417
• 期：Complete
• 页码：402-409
• 全文大小：1565 K

文摘

Enhanced photocatalytic degradation of methylene blue (MB) using graphitic carbon nitride/titanium dioxide (g-C₃N₄/TiO₂) catalyst films has been demonstrated in this present work. The g-C₃N₄/TiO₂ composites were prepared by directly heating the mixture of melamine and pre-synthesized TiO₂ nanoparticles in Ar gas flow. The g-C₃N₄ contents in the g-C₃N₄/TiO₂ composites were varied as 0, 20, 50 and 70 wt%. It was found that the visible-light-induced photocatalytic degradation of MB was remarkably increased upon coupling TiO₂ with g-C₃N₄ and the best degradation performance of 鈭?0% was obtained from 50 wt% g-C₃N₄ loading content. Results from UV-vis absorption study, Electron microscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy suggest that the improved photoactivity is due to a decrease in band gap energy, an increased light absorption in visible light region and possibly an enhanced electron-hole separation efficiency as a result of effective interfacial electron transfer between TiO₂ and g-C₃N₄ of the g-C₃N₄/TiO₂ composite film. Based on the obtained results, the possible MB degradation mechanism is ascribed mainly to the generation of active species induced by the photogenerated electrons.