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Graphene-Based TiO 2 Nanocomposite for Photocatalytic Degradation of Dyes in Aqueous Solution under Solar-Like Radiation.
- Source :
- Applied Sciences (2076-3417); May2021, Vol. 11 Issue 9, p3966, 15p
- Publication Year :
- 2021
-
Abstract
- This study presents a novel method for the development of TiO<subscript>2</subscript>/reduced graphene oxide (rGO) nanocomposites for photocatalytic degradation of dyes in an aqueous solution. The synergistic integration of rGO and TiO<subscript>2</subscript>, through the formation of Ti–O–C bonds, offers an interesting opportunity to design photocatalyst nanocomposite materials with the maximum absorption shift to the visible region of the spectra, where photodegradation can be activated not only with UV but also with the visible part of natural solar irradiation. TiO<subscript>2</subscript>@rGO nanocomposites with different content of rGO have been self-assembled by the hydrothermal method followed by calcination treatment. The morphological and structural analysis of the synthesized photocatalysts was performed by FTIR, XRD, XPS, UV-Vis DRS, SEM/EDX, and Raman spectroscopy. The effectiveness of the synthesized nanocomposites as photocatalysts was examined through the photodegradation of methylene blue (MB) and rhodamine B (RhB) dye under artificial solar-like radiation. The influence of rGO concentration (5 and 15 wt.%) on TiO<subscript>2</subscript> performance for photodegradation of the different dyes was monitored by UV-Vis spectroscopy. The obtained results showed that the synthesized TiO<subscript>2</subscript>@rGO nanocomposites significantly increased the decomposition of RhB and MB compared to the synthesized TiO<subscript>2</subscript> photocatalyst. Furthermore, TiO<subscript>2</subscript>@rGO nanocomposite with high contents of rGO (15 wt.%) presented an improved performance in photodegradation of MB (98.1%) and RhB (99.8%) after 120 min of exposition to solar-like radiation. These results could be mainly attributed to the decrease of the bandgap of synthesized TiO<subscript>2</subscript>@rGO nanocomposites with the increased contents of rGO. Energy gap (E<subscript>g</subscript>) values of nanocomposites are 2.71 eV and 3.03 eV, when pure TiO<subscript>2</subscript> particles have 3.15 eV. These results show the potential of graphene-based TiO<subscript>2</subscript> nanocomposite to be explored as a highly efficient solar light-driven photocatalyst for water purification. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20763417
- Volume :
- 11
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Applied Sciences (2076-3417)
- Publication Type :
- Academic Journal
- Accession number :
- 150374818
- Full Text :
- https://doi.org/10.3390/app11093966