Bio-inspired unprecedented synthesis of reduced graphene oxide: a catalytic probe for electro-/chemical reduction of nitro groups in an aqueous medium

2018 ◽  
Vol 42 (3) ◽  
pp. 2067-2073 ◽  
Author(s):  
Suhasini Mahata ◽  
Anjumala Sahu ◽  
Prashant Shukla ◽  
Ankita Rai ◽  
Manorama Singh ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Aqueous Medium ◽  
Gallic Acid ◽  
Reduced Graphene Oxide ◽  
Leaf Extract ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Reduced Graphene ◽  
Catalytic Probe

The first green reduction of graphene oxide (GO) using cashew leaf extract as a biorenewable catalyst containing water soluble tannins and gallic acid is reported herein. The synthesized rGO has been well characterized.

scholarly journals A Facile and Green Synthesis of a MoO2-Reduced Graphene Oxide Aerogel for Energy Storage Devices

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 594 ◽  
Author(s):  
Mara Serrapede ◽  
Marco Fontana ◽  
Arnaud Gigot ◽  
Marco Armandi ◽  
Glenda Biasotto ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Chemical Reduction ◽  
Low Cost ◽  
Xps Analysis ◽  
3D Scaffold ◽  
Energy Storage Devices ◽  
Reduced Graphene

A simple, low cost, and “green” method of hydrothermal synthesis, based on the addition of l-ascorbic acid (l-AA) as a reducing agent, is presented in order to obtain reduced graphene oxide (rGO) and hybrid rGO-MoO2 aerogels for the fabrication of supercapacitors. The resulting high degree of chemical reduction of graphene oxide (GO), confirmed by X-Ray Photoelectron Spectroscopy (XPS) analysis, is shown to produce a better electrical double layer (EDL) capacitance, as shown by cyclic voltammetric (CV) measurements. Moreover, a good reduction yield of the carbonaceous 3D-scaffold seems to be achievable even when the precursor of molybdenum oxide is added to the pristine slurry in order to get the hybrid rGO-MoO2 compound. The pseudocapacitance contribution from the resulting embedded MoO2 microstructures, was then studied by means of CV and electrochemical impedance spectroscopy (EIS). The oxidation state of the molybdenum in the MoO2 particles embedded in the rGO aerogel was deeply studied by means of XPS analysis and valuable information on the electrochemical behavior, according to the involved redox reactions, was obtained. Finally, the increased stability of the aerogels prepared with l-AA, after charge-discharge cycling, was demonstrated and confirmed by means of Field Emission Scanning Electron Microscopy (FESEM) characterization.

Chemically reduced graphene oxide-coated knitted fabric imparted conductivity and outstanding hydrophobicity

2021 ◽  
pp. 004051752199547
Author(s):  
Min Hou ◽  
Xinghua Hong ◽  
Yanjun Tang ◽  
Zimin Jin ◽  
Chengyan Zhu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Chemical Reduction ◽  
Knitted Fabric ◽  
Mesh Structure ◽  
Reduced Graphene ◽  
Chemically Reduced Graphene Oxide ◽  
Modified Hummers Method

Functionalized knitted fabric, as a kind of flexible, wearable, and waterproof material capable of conductivity, sensitivity and outstanding hydrophobicity, is valuable for multi-field applications. Herein, the reduced graphene oxide (RGO)-coated knitted fabric (polyester/spandex blended) is prepared, which involves the use of graphite oxide (GO) by modified Hummers method and in-situ chemical reduction with hydrazine hydrate. The treated fabric exhibits a high electrical conductivity (202.09 S/cm) and an outstanding hydrophobicity (140°). The outstanding hydrophobicity is associated with the morphology of the fabric and fiber with reference to pseudo-infiltration. These properties can withstand repeated bending and washing without serious deterioration, maintaining good electrical conductivity (35.70 S/cm) and contact angle (119.39°) after eight standard washing cycles. The material, which has RGO architecture and continuous loop mesh structure, can find wide use in smart garment applications.

Electrochemical Determination of Isoniazid Using Gallic Acid Supported Reduced Graphene Oxide

2017 ◽  
Vol 164 (7) ◽  
pp. H503-H508 ◽  
Author(s):  
Paramasivam Balasubramanian ◽  
Balamurugan Thirumalraj ◽  
Shen-Ming Chen ◽  
Palani Barathi
Keyword(s):  
Graphene Oxide ◽  
Gallic Acid ◽  
Reduced Graphene Oxide ◽  
Electrochemical Determination ◽  
Reduced Graphene

Facile synthesis of water soluble reduced graphene oxide with a high concentration and its application in printable micro-supercapacitors

2017 ◽  
Vol 1 (7) ◽  
pp. 1601-1610 ◽  
Author(s):  
Haibo Su ◽  
Pengli Zhu ◽  
Leicong Zhang ◽  
Fengrui Zhou ◽  
Xianwen liang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Efficient Method ◽  
Water Soluble ◽  
High Concentration ◽  
Facile Synthesis ◽  
Direct Printing ◽  
Reduced Graphene

A facile and efficient method has been developed to synthesize water soluble graphene (WSG), and MSCs could be easily fabricated by direct printing using WSG-based ink.

Sunlight assisted degradation of dye molecules and reduction of toxic Cr(vi) in aqueous medium using magnetically recoverable Fe3O4/reduced graphene oxide nanocomposite

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 11049-11063 ◽  
Author(s):  
Purna K. Boruah ◽  
Priyakshree Borthakur ◽  
Gitashree Darabdhara ◽  
Chaitanya K. Kamaja ◽  
Indrapal Karbhal ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Aqueous Medium ◽  
Reduced Graphene Oxide ◽  
Dye Molecules ◽  
Reduced Graphene ◽  
Magnetically Recoverable Catalysts ◽  
Recoverable Catalysts ◽  
Photocatalytic Applications

In view of the significant impact of magnetically recoverable catalysts in photocatalytic applications, Fe3O4/rGO nanocomposite photocatalyst was synthesized and utilized as an efficient photocatalyst for the degradation of dye molecules and reduction of the toxic Cr(vi).

scholarly journals Synthesis and Characterization of Reduced Graphene Oxide (rGO) Started from Graphene Oxide (GO) Using the Tour Method with Different Parameters

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Adere Tarekegne Habte ◽  
Delele Worku Ayele
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Potassium Permanganate ◽  
Chemical Reduction ◽  
Volume Ratio ◽  
Graphite Powder ◽  
Green Approach ◽  
Synthesis Strategy ◽  
Reduced Graphene ◽  
Diffraction Patterns

A new approach to synthesize graphene is oxidizing graphite powder with a mixture of H2SO4/H3PO4 acids and potassium permanganate. Parameters such as reaction time, reaction temperature, and amount of concentration were varied to study the degree of oxidation of graphite to graphene oxide. Currently, an improved method for the preparation of graphene oxide was the most common one. A mixture of H2SO4/H3PO4 (9 : 1 volume ratio) instead of only H2SO4 resulted in increased hydrophilic and oxidized GO without the emission of toxic gas, which differs from the traditional Hummers’ method. The graphene oxide (GO) was converted to reduced graphene oxide (rGO) by chemical reduction using ascorbic acid as the reducing agent. The GO and rGO were characterized by UV-visible spectroscopy, FTIR spectroscopy, and X-ray diffraction patterns. The result showed that treating graphite powder with potassium permanganate (1 : 9) and a mixture of concentrated H2SO4/H3PO4 acids at 50°C for 12 hours resulted in a better oxidation degree. The designed synthesis strategy could be easily controlled and is an alternative green approach for the production of graphene oxide and reduced graphene oxide.

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