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Sonophotocatalytic Dye Degradation Using rGO-BiVO4 Composites
Manish Kumar1, M N M Ansari2, Imed Boukhris3,4
1School of Engineering Indian Institute of Technology Mandi Mandi Himachal Pradesh 175005 India.
Global Challenges (Hoboken, NJ)
|June 17, 2022
Summary
Reduced graphene oxide (rGO)/bismuth vanadate composites show enhanced sonophotocatalytic degradation of methylene blue dye. The 2 wt% rGO composite achieved 52% degradation, significantly outperforming pure bismuth vanadate.
Area of Science:
- Materials Science
- Environmental Chemistry
- Nanotechnology
Background:
- Semiconductor photocatalysis is crucial for pollutant degradation.
- Bismuth vanadate (BiVO4) shows promise but requires enhancement for efficiency.
- Reduced graphene oxide (rGO) can improve photocatalyst performance through synergistic effects.
Purpose of the Study:
- To fabricate and characterize reduced graphene oxide (rGO)/bismuth vanadate (BiVO4) composites.
- To investigate the sonophotocatalytic degradation of methylene blue (MB) dye using these composites.
- To determine the optimal rGO content for enhanced dye degradation efficiency.
Main Methods:
- Fabrication of rGO/BiVO4 composites using ultrasonication, photoinduced reduction, and hydrothermal methods.
- Material characterization via TEM, XRD, XPS, FTIR, and Raman spectroscopy.
- Sonophotocatalytic degradation experiments of MB dye under visible light irradiation.
Main Results:
- rGO/BiVO4 composites were successfully synthesized with confirmed BiVO4 and rGO coexistence.
- TEM and XPS confirmed interfaces and elemental oxidation states, crucial for charge transport.
- The 2 wt% rGO/BiVO4 composite achieved approximately 52% MB dye degradation, a significant improvement over pure BiVO4 (≈25%) in 180 minutes.
Conclusions:
- rGO doping significantly enhances the sonophotocatalytic activity of BiVO4 for MB dye degradation.
- The 2 wt% rGO/BiVO4 composite demonstrates superior performance due to improved charge carrier transport.
- The developed composite shows potential for environmental remediation applications, with preliminary phytotoxicity analysis conducted.
