A facile microwave approach to synthesize RGO-BaWO<sub>4</sub> composites for high performance visible light induced photocatalytic degradation of dyes

Mohamed Jaffer Sadiq Mohamed; Denthaje Krishna Bhat; Mohamed Jaffer Sadiq Mohamed; Denthaje Krishna Bhat

doi:10.3934/matersci.2017.2.487

AIMS Materials Science

2017, Volume 4, Issue 2: 487-502. doi: 10.3934/matersci.2017.2.487

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A facile microwave approach to synthesize RGO-BaWO₄ composites for high performance visible light induced photocatalytic degradation of dyes

Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Mangalore-575025, Karnataka, India

Received: 31 January 2017 Accepted: 17 March 2017 Published: 22 March 2017

Photocatalysts with enhanced efficiency for environmental remediation requires an effective separation of photogenerated electron hole pairs and optimum charge carrier transport. Based on the above criteria, a cost effective, facile one-pot microwave approach was made to synthesize RGO-BaWO₄ composites with excellent stability and reusability in photodegradation of methylene blue (MB) and methyl orange (MO). A series of composites with varying composition with respect to RGO was synthesized and thoroughly characterized using various techniques. The composite with 2.5% RGO-BaWO₄ showed maximum efficiency under visible light irradiation. The mechanism of charge transfer and kinetics of the reaction was also studied. The interfacial/interparticle charge transfer between the narrow elliptical BaWO₄ particles and RGO is found to be responsible for the increased efficiency. The photo generated holes and the superoxide radical were found to play a key role in the degradation process. The synergistic action makes RGO-BaWO₄ composites a promising material as high performance photocatalyst for degradation of organic dyes.
- RGO-BaWO₄ composites,
- microwave method,
- photodegradation,
- methylene blue,
- methyl orange
Citation: Mohamed Jaffer Sadiq Mohamed, Denthaje Krishna Bhat. A facile microwave approach to synthesize RGO-BaWO4 composites for high performance visible light induced photocatalytic degradation of dyes[J]. AIMS Materials Science, 2017, 4(2): 487-502. doi: 10.3934/matersci.2017.2.487

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Abstract

Photocatalysts with enhanced efficiency for environmental remediation requires an effective separation of photogenerated electron hole pairs and optimum charge carrier transport. Based on the above criteria, a cost effective, facile one-pot microwave approach was made to synthesize RGO-BaWO₄ composites with excellent stability and reusability in photodegradation of methylene blue (MB) and methyl orange (MO). A series of composites with varying composition with respect to RGO was synthesized and thoroughly characterized using various techniques. The composite with 2.5% RGO-BaWO₄ showed maximum efficiency under visible light irradiation. The mechanism of charge transfer and kinetics of the reaction was also studied. The interfacial/interparticle charge transfer between the narrow elliptical BaWO₄ particles and RGO is found to be responsible for the increased efficiency. The photo generated holes and the superoxide radical were found to play a key role in the degradation process. The synergistic action makes RGO-BaWO₄ composites a promising material as high performance photocatalyst for degradation of organic dyes.

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