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Catalysts 2017, 7(5), 133; doi:10.3390/catal7050133

Sol-Gel-Assisted Microwave-Derived Synthesis of Anatase Ag/TiO2/GO Nanohybrids toward Efficient Visible Light Phenol Degradation

1
Department of Chemistry, College of Science and General Studies, Alfaisal University, P.O. BOX 50927,Riyadh 11533, Saudi Arabia
2
Center of Excellence in Nanotechnology, Asian Institute of Technology, PO Box 4, Klong Luang,Pathumthani ‐ 12120, Thailand
3
Physical Chemistry Dept., National Research Centre, Dokki, Cairo 12622, Egypt
4
Department of Chemistry, Faculty of Science, Al‐Imam Mohammed ibn Saud University, P.O. BOX 90950,Riyadh 11623, Saudi Arabia
5
Department of Nanomedicine, King Abdullah International Medical Research Center, King AbdulazizMedical City, National Guard Health Affairs, P. O. Box 22490, Riyadh 11462, Saudi Arabia
6
Functional Materials Division, School of Information and Communication Technology, KTH RoyalInstitute of Technology, Isafjorsgatan 22, SE‐164 40 Kista, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Damien P. Debecker
Received: 13 March 2017 / Revised: 13 April 2017 / Accepted: 27 April 2017 / Published: 1 May 2017
(This article belongs to the Special Issue Sol–Gel Chemistry: A Toolbox for Catalyst Preparation)
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Abstract

Abstract: A simple microwave-assisted (MWI) wet chemical route to synthesize pure anatase phase titanium dioxide (TiO2) nanoparticles (NPs) is reported here using titanium tetrachloride (TiCl4) as starting material. The as-prepared TiO2 NPs were characterized by electron microscopy, X-ray diffraction, UV/visible absorption spectroscopy, and infrared and Raman spectroscopic techniques. Further modification of the anatase TiO2 NPs was carried out by incorporating plasmonic silver (Ag) NPs and graphene oxide (GO) in order to enhance the visible light absorption. The photocatalytic activities of the anatase TiO2, Ag/TiO2, and Ag/TiO2/GO nanocomposites were evaluated under both ultraviolet (UV) and visible light irradiation using phenol as a model contaminant. The presence of Ag NPs was found to play a significant role to define the photocatalytic activity of the Ag/TiO2/GO nanocomposite. It was found that the Ag performed like a sink under UV excitation and stored photo-generated electrons from TiO2, whereas, under visible light excitation, the Ag acted as a photosensitizer enhancing the photocatalytic activity of the nanocomposite. The detailed mechanism was studied based on photocatalytic activities of Ag/TiO2/GO nanocomposites. Therefore, the as-prepared Ag/TiO2/GO nanocomposite was used as photocatalytic materials under both UV and visible light irradiation toward degradation of organic molecules. View Full-Text
Keywords: TiO2; graphene oxide; XRD; photocatalysts TiO2; graphene oxide; XRD; photocatalysts
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MDPI and ACS Style

Alsharaeh, E.H.; Bora, T.; Soliman, A.; Ahmed, F.; Bharath, G.; Ghoniem, M.G.; Abu-Salah, K.M.; Dutta, J. Sol-Gel-Assisted Microwave-Derived Synthesis of Anatase Ag/TiO2/GO Nanohybrids toward Efficient Visible Light Phenol Degradation. Catalysts 2017, 7, 133.

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