Synthesis, characterization and catalytic activity of graphene oxide/ZnO nanocomposites

Abstract

This paper reports on the synthesis and use of graphene oxide/ZnO nanocomposite as a heterogeneous catalyst for the synthesis of various tetrazoles. The catalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and UV-vis spectroscopy. This method has the advantages of high yields, elimination of homogeneous catalysts or corrosive acids, simple methodology and easy work up. Another important factor is the stability and recyclability of the catalyst under the reaction conditions used. This heterogeneous catalyst shows no significant loss of activity in the recycling experiments.

Effect of Enhanced RuO2 Layer on the Sustainability of Ru/MMT Catalyst towards [3+2] Cycloaddition Reaction

“…From the above discussion, it can be concluded that oxide layer on Ru/MMT composite significantly contributes for excellent catalytic activity towards tetrazole synthesis. To further establish that this activity is achieved due to presence of oxide layer on the surface of nanocomposites, a comparison is made with the different oxide based heterogeneous catalysts . employed for the synthesis of tettrazoles with recycling capability ( Table ) .…”

“…To further establish that this activity is achieved due to presence of oxide layer on the surface of nanocomposites, a comparison is made with the different oxide based heterogeneous catalysts. [28][29][30][31][32][33][34][35][36][37] employed for the synthesis of tettrazoles with recycling capability ( Table 3).…”

Green synthesis of Pd/Fe 3 O 4 nanoparticles using Euphorbia condylocarpa M. bieb root extract and their catalytic applications as magnetically recoverable and stable recyclable catalysts for the phosphine-free Sonogashira and Suzuki coupling reactions

“…In continuation of our efforts to develop environmentally friendly synthetic methodologies [23][24][25][26][27][28][29], we now wish to report a new and rapid protocol for the preparation of Pd/Fe 3 O 4 NPs by using Euphorbia condylocarpa M. bieb extract ( Figure 1) as a reducing and stabilizing agent and the application of these NPs as novel and stable heterogeneous catalysts in the copper-and phosphine-free Sonogashira and Suzuki coupling reactions. …”

A Facile Green Reduction for Graphene‐Silver Nanocomposite Using Betel Leaf Extract for the Photocatalytic Degradation of Water Pollutants

“…The use of plant extracts as reducing agents will effectively reduce the environmental pollution, production cost and produces biocompatible materials. Literature has witnessed the synthesis of graphene and its composites according to the green chemistry point of view using eco‐friendly reagents such as L‐ascorbic acid, L–Lysine, glucose, tea polyphenols, mortino berry extract, Fenugreek seeds extract, E. Helioscopia L. Leaf extract, E. Bungei Bioss, W. Coagulans leaf extract, barberry fruit extract, etc …”

“…Literature has witnessed the synthesis of graphene and its composites according to the green chemistry point of view using eco-friendly reagents such as L-ascorbic acid, L-Lysine, glucose, tea polyphenols, mortino berry extract, Fenugreek seeds extract, E. Helioscopia L. Leaf extract, E. Bungei Bioss, W. Coagulans leaf extract, barberry fruit extract, etc. [17][18][19][20][21][22][23][24][25][26][27][28] Betel tree from Piperaceae family is native to Malaysia whose scientific name is Piper Betle which is popularly known as Paan in India (Vedic name-saptasira). [29] It is extensively cultivated in India, Sri Lanka and in some parts of South Asia owing to its wide use as a mouth freshener.…”