Green synthesis of a Cu/reduced graphene oxide/Fe3O4 nanocomposite using Euphorbia wallichii leaf extract and its application as a recyclable and heterogeneous catalyst for the reduction of 4-nitrophenol and rhodamine B

RSC Advances ◽  
2015 ◽  
Vol 5 (111) ◽  
pp. 91532-91543 ◽  
Author(s):  
Monireh Atarod ◽  
Mahmoud Nasrollahzadeh ◽  
S. Mohammad Sajadi
Keyword(s):  
Graphene Oxide ◽  
Green Synthesis ◽  
Reduced Graphene Oxide ◽  
Heterogeneous Catalyst ◽  
Rhodamine B ◽  
Leaf Extract ◽  
Synthesis Method ◽  
Biological Reduction ◽  
Stabilizing Agent ◽  
Reduced Graphene

Herein, we describe a green and eco-friendly synthesis method for preparing a Cu/RGO/Fe3O4 nanocomposite through biological reduction of graphene oxide and Cu2+, Fe3+ ions using Euphorbia wallichii leaf extract as a reducing and stabilizing agent.

scholarly journals Green Synthesis of Reduced Graphene Nanosheets Using Leaf Extract of Tridax procumbens and its Potential In-Vitro Biological Activities

2020 ◽  
Vol 2 (1) ◽  
pp. 93
Keyword(s):  
Graphene Oxide ◽  
Green Synthesis ◽  
Reduced Graphene Oxide ◽  
Leaf Extract ◽  
Spectroscopic Analysis ◽  
Graphene Nanosheets ◽  
Biological Activities ◽  
Tridax Procumbens ◽  
Reduced Graphene

Graphene oxide nanoparticles has found immense application in bio therapeutics owing to its biocompatibility and enhanced effectiveness in drug delivery. The present study investigates the green synthesis of reduced graphene oxide using leaf extract using Tridax procumbens and testing its in-vitro biological activities. The biosynthesized reduced graphene oxide (rGO) was characterized by various spectroscopic and microscopic techniques. UV-vis spectroscopic analysis primarily detected the shift in the absorption peak from 232 to 287 nm confirming the reduction of TP-rGO. FTIR spectra of TP-rGO confirmed effective deoxygenation of GO assisted by bioactive molecules present in the leaf extract. Raman spectroscopic analysis identified successful reduction of GO through the presence of D band at 1329 cm-1 and G band at 1577 cm-1. XRD spectra of TP-rGO showed diffraction peak 2θ at 25o confirming the presence of reduced GO. SEM analysis revealed the presence of graphene nanosheets appearing as large aggregated structure. The bioreduced rGO showed anti-oxidant effect against DPPH radical observed in concentration dependent manner. The TP-rGO nanosheets exhibited bactericidal effect against gram positive bacteria: B.subitils (18 mm) and S. epidermis (9 mm) and gram negative bacteria: E.coli (14 mm) and P. aeruginosa (6 mm) at 100 µg/ml confirming the enhanced anti-bacterial effects of TP-rGO against gram positive pathogens. Hence, it is highlighted that leaf extract of Tridax procumbens act as green reducing agent for the successful biosynthesis of rGO nanosheets demonstrating potential in-vitro biological activities and has great scope in the preparation of nano drugs for the treatment of various diseases.

Eco-friendly foul release coatings based on a novel reduced graphene oxide/Ag nanocomposite prepared by a green synthesis approach

2021 ◽  
Vol 151 ◽  
pp. 106107
Author(s):  
Soolmaz Soleimani ◽  
Ali Jannesari ◽  
Morteza Yousefzadi ◽  
Arash Ghaderi ◽  
Adnan Shahdadi
Keyword(s):  
Graphene Oxide ◽  
Green Synthesis ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
Synthesis Approach

Reduced Graphene Oxide Paper: Fabrication by a Green Thermal Reduction Method and Preliminary Study of its In Vitro Cytotoxicity

2017 ◽  
Vol 45 ◽  
pp. 199-207 ◽  
Author(s):  
Xin Wang ◽  
Peng Li ◽  
Claudia Luedecke ◽  
Qiang Zhang ◽  
Zan Wang ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Mammalian Cells ◽  
Reduction Method ◽  
Heating Temperature ◽  
Synthesis Method ◽  
Thermal Reduction ◽  
Graphene Films ◽  
Reduced Graphene

Graphene films have been intensively explored because of their unique mechanical and physicochemical properties for potential applications in field of tissue engineering and implants. However, for biomedical applications, it is necessary to fully understand the toxicity and biocompatibility of the prepared graphene films since different synthesis method might lead to different biological properties. Here we report a step-by-step thermal reduction method of preparing reduced graphene oxide (rGO) film directly on various substrates at low heating temperature (below about 200 °C) without requiring any chemical reduction agent like hydrazine or other reductants (therefore we call it green method). Slowly heating GO hydrosol that was coated on the surface of a glass cell-culture dish or inside of a polypropylene tube from room temperature to 60, 100, and 160 °C for 12 h, respectively, a shiny and flat surface without crumpled structure or tiny pores was formed. We peeled it off from the substrate to explore its cytotoxicity. The results exhibited that the rGO film was biocompatible with Cal-72 cell but against Escherichia coli bacteria. Our work confirmed that rGO film produced by the green reduction method is cytocompatible with mammalian cells, which makes this rGO film a promising material for tissue engineering scaffold or as a surface-modification coating of an implant.

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