Reduced graphene oxide-supported Ag-loaded Fe-doped TiO2 for the degradation mechanism of methylene blue and its electrochemical properties

Graphene oxide-based composites have been developed as cheap and effective photocatalysts for dye degradation and water splitting applications. Herein, we report reduced graphene oxide (rGO)/Ag/Fe-doped TiO2 that has been successfully prepared using a simple process. The resulting composites were ch...

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Bibliographic Details
Published in:RSC advances 2018-01, Vol.8 (12), p.6488-6501
Main Authors: Jaihindh, Dhayanantha Prabu, Chen, Ching-Cheng, Fu, Yen-Pei
Format: Article
Language:English
Subjects:
Catalytic activity
Chemistry
Composite materials
Degradation
Electrochemical analysis
Graphene
Light irradiation
Methylene blue
Nitrophenol
Oxygen evolution reactions
Photocatalysis
Silver
Sulfuric acid
Titanium dioxide
Titanium oxides
Water splitting
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Summary:Graphene oxide-based composites have been developed as cheap and effective photocatalysts for dye degradation and water splitting applications. Herein, we report reduced graphene oxide (rGO)/Ag/Fe-doped TiO2 that has been successfully prepared using a simple process. The resulting composites were characterized by a wide range of physicochemical techniques. The photocatalytic activities of the composite materials were studied under visible light supplied by a 35 W Xe arc lamp. The rGO/Ag/Fe-doped TiO2 composite demonstrated excellent degradation of methylene blue (MB) in 150 min and 4-nitrophenol (4-NP) in 210 min under visible light irradiation, and trapping experiments were carried out to explain the mechanism of photocatalytic activity. Moreover, electrochemical studies were carried out to demonstrate the oxygen evolution reaction (OER) activity on rGO/Ag/Fe-doped TiO2 in 1 M of H2SO4 electrolyte, with a scan rate of 50 mV s−1. The reductions in overpotential are due to the d-orbital splitting in Fe-doped TiO2 and rGO as an electron collector and transporter.
ISSN:2046-2069
2046-2069
DOI:10.1039/c7ra13418e