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http://hdl.handle.net/10266/5132
Title: | Enhanced Photocatalytic Degradation of Industrial Dye by g-C3N4/TiO2 Nanocomposite: Role of Shape of TiO2 |
Authors: | Monga, Divya |
Supervisor: | Basu, Soumen |
Keywords: | Graphitic Carbon Nitride;Nanorods;Nanospheres;Photodegradation;Nanocomposite |
Issue Date: | 1-Aug-2018 |
Abstract: | Enhanced photodegradation of RhB dye by using synthesized g-C3N4/TiO2 nanocomposite having different shapes of TiO2, showing role of shape of TiO2 in photodegradation has been demonstrated in this present work. As TiO2 has a wide band gap of 3.2 eV and utilize energy of radiations of only UV region of light, so has some limitations as a photocatalyst. To improve the photocatalytic efficiency of TiO2 we have incorporated g-C3N4, a visible light active photocatalyst. The TiO2 nanoparticles with different shapes (Nanorods, Nanospheres, and Nanotubes) were prepared by different methods. The g-C3N4 was prepared by pyrolysis of Urea. The g-C3N4/TiO2 composites were prepared by stirring g-C3N4and pre-synthesized TiO2 nanoparticles. The ratio of g-C3N4 and TiO2 nanoparticles is 1:1. On performing photocatalytic experiment we have found that the degradation of RhB dye under visible light irradiation has been increased remarkably upon incorporation of g-C3N4 with different shapes of TiO2. Also, shape of TiO2 has a remarkable effect in photodegradation. The best degradation performance of ∼97% was obtained from g-C3N4/TiO2 (Nanorods) composite. Although, degradation efficiency of composite of other shapes of TiO2 (Nanospheres and Nanotubes) with g-C3N4 were also found to be greater than that of g-C3N4/TiO2 (P25) composite. Results from UV–Vis absorption study, X-ray Diffraction studies, and X-ray photoelectron spectroscopy suggest that the improvement in photocatalytic activity of composite is due to decrease in band gap energy and increased light absorption in visible region. Also there is an increase in electron hole separation efficiency due to effectual interfacial transfer of electron between g-C3N4 and TiO2 (NR, NS, NT) of g-C3N4/TiO2 composites. The BET surface area analyzer, HRTEM, FESEM and Electron Diffraction studies with Color mapping indicate successful incorporation of g-C3N4 with TiO2 in the composites. Results from scavenger study indicate that electron and superoxide ions act as main reactive species in photodegradation of RhB dye by the composite. |
URI: | http://hdl.handle.net/10266/5132 |
Appears in Collections: | Masters Theses@SCBC |
Files in This Item:
File | Description | Size | Format | |
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final online.pdf | 3.63 MB | Adobe PDF | View/Open |
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