Electrospinning Directly Synthesized Porous TiO2 Nanofibers Modified by Graphitic Carbon Nitride Sheets for Enhanced Photocatalytic Degradation Activity under Solar Light Irradiation

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• 作者：Surya Prasad Adhikari ; Ganesh Prasad Awasthi ; Han Joo Kim ; Chan Hee Park ; Cheol Sang Kim
• 刊名：Langmuir
• 出版年：2016
• 出版时间：June 21, 2016
• 年：2016
• 卷：32
• 期：24
• 页码：6163-6175
• 全文大小：887K
• 年卷期：0
• ISSN：1520-5827

文摘

We report a direct approach to the fabrication of a composite made of porous TiO₂ nanofibers (NFs) and graphitic carbon nitride (g-C₃N₄) sheets, by means of an angled two-nozzle electrospinning combined with calcination process. Different wt % amounts of g-C₃N₄ particles in a polymer solution from one nozzle and TiO₂ precursors containing the same polymer solution from another nozzle were electrospun and deposited on the collector. Structural characterizations confirm a well-defined morphology of the TiO₂/g-C₃N₄ composite in which the TiO₂ NFs are uniformly attached on the g-C₃N₄ sheet. This proper attachment of TiO₂ NFs on the g-C₃N₄ sheets occurred during calcination. The prepared composites showed the enhanced photocatalytic activity over the photodegradation of rhodamine B and reactive black 5 under natural sunlight. Here, the synergistic effect between the g-C₃N₄ sheets and the TiO₂ NFs having anisotropic properties enhanced the photogenerated electron–hole pair separation and migration, which was confirmed by the measurement of photoluminescence spectra, cyclic voltammograms, and electrochemical impedance spectra. The direct synthesis approach that is established here for such kinds of sheetlike structure and porous NFs composites could provide new insights for the design of high-performance energy conversion catalysts.