NDLI: Sonochemically synthesized mono and bimetallic Au-Ag reduced graphene oxide based nanocomposites with enhanced catalytic activity.

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Sonochemically synthesized MnO2 nanoparticles as electrode material for supercapacitors.

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Sonochemically synthesized mono and bimetallic Au-Ag reduced graphene oxide based nanocomposites with enhanced catalytic activity.

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Applications of sonochemistry in Russian food processing industry.

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Ultrasound improves the renneting properties of milk.

Cavitation technology - a greener processing technique for the generation of pharmaceutical nanoemulsions.

Sonoelectrochemical degradation of triclosan in water.

Sonocrystallisation of lactose in concentrated whey.

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Sonochemically synthesized mono and bimetallic Au-Ag reduced graphene oxide based nanocomposites with enhanced catalytic activity.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Neppolian, Bernaurdshaw Wang, Chang Ashokkumar, Muthupandian
Description	Author Affiliation: Neppolian B ( SRM-Research Institute, SRM University, Kattankulathur, Chennai 603 203, India); Wang C ( The School of Chemistry, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia.); Ashokkumar M ( The School of Chemistry, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia.)
Abstract	Graphene oxide (GO) supported Ag and Au mono-metallic and Au-Ag bimetallic catalysts were synthesized using a sonochemical method. Bimetallic catalysts containing different weight ratios of Au and Ag were loaded onto GO utilizing a low frequency horn-type ultrasonicator. High frequency ultrasonication was used to efficiently reduce Ag(I) and Au(III) ions in the presence of polyethylene glycol and 2-propanol. Transmission electron microscopy (TEM-EDX) and X-ray photoelectron spectroscopy were used to analyze the morphology, size, shape and chemical oxidation states of the prepared metallic catalysts on GO. The catalytic efficiency of the prepared catalysts were compared using 4-nitrophenol (4-NP) reduction reaction and the subsequent formation of 4-aminophenol (4-AP) that was also monitored using UV-vis spectrophotometry. The results revealed that Au-Ag-GO bimetallic catalysts showed high activity for the conversion of 4-NP to 4-AP than their monometallic counterparts. Amongst different weight ratios (1:1, 1:2 and 2:1) between Au and Ag, the 1:2 (Au:Ag) catalyst exhibited very good catalytic performance for the conversion of 4-NP to 4-AP. A total reduction of 4-NP took place within a short period of time if Au-GO was reduced first followed by Ag reduction, whereas a lower reduction rate was observed if Ag-GO was reduced first. The same trend was observed for all the ratios of bimetallic catalysts prepared by this method. The initial unfavorable reduction potential of Ag(I) is likely to be responsible for the above order. It was found that applying dual frequency ultrasonication was a highly effective way of preparing bimetallic catalysts requiring relatively low levels of added chemicals and producing bimetallic catalysts with GO with improved catalytic efficiency.
File Format	HTM / HTML
ISSN	13504177
Issue Number	6
Journal	Ultrasonics Sonochemistry
Volume Number	21
e-ISSN	18732828
Language	English
Publisher	Elsevier
Publisher Date	2014-11-01
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Diagnostic Imaging
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Environmental Chemistry Acoustics and Ultrasonics Radiology, Nuclear Medicine and Imaging Chemical Engineering Inorganic Chemistry

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