Increasing the antioxidant activity of green tea polyphenols in the presence of iron for the reduction of graphene oxide

Akhavan, Omid; Kalaee, Mohammadreza; Alavi, Zahra; Ghiasi, Seyyed Mohammad Amin; Esfandiar, Ali

doi:10.1016/j.carbon.2012.02.087

Cited by 255 publications

(125 citation statements)

References 48 publications

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“…17 Metal/hydrochloric acid reduction is another alternative; however, impurities formed from the residual metal hinders further applications. 18,19 Recently, reduction of GO using environmentally friendly organic agents such as vitamin C, 20 amino acid, 21 glucose, 22 protein, 23 green tea, 24,25 dextran, 26 bacterial respiration, 27 and Escherichia coli 12 have taken a center stage and have been proposed as alternatives. Although these methods are ecofriendly, they demand tedious experimental procedures and require expensive reagents and longer reaction times.…”

Section: Introductionmentioning

confidence: 99%

Exceedingly biocompatible and thin-layered reduced graphene oxide nanosheets using an eco-friendly mushroom extract strategy

Muthoosamy

Bai

Abubakar

et al. 2015

IJN

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Purpose A simple, one-pot strategy was used to synthesize reduced graphene oxide (RGO) nanosheets by utilizing an easily available over-the-counter medicinal and edible mushroom, Ganoderma lucidum . Methods The mushroom was boiled in hot water to liberate the polysaccharides, the extract of which was then used directly for the reduction of graphene oxide. The abundance of polysaccharides present in the mushroom serves as a good reducing agent. The proposed strategy evades the use of harmful and expensive chemicals and avoids the typical tedious reaction methods. Results More importantly, the mushroom extract can be easily separated from the product without generating any residual byproducts and can be reused at least three times with good conversion efficiency (75%). It was readily dispersible in water without the need of ultrasonication or any surfactants; whereas 5 minutes of ultrasonication with various solvents produced RGO which was stable for the tested period of 1 year. Based on electrochemical measurements, the followed method did not jeopardize RGO’s electrical conductivity. Moreover, the obtained RGO was highly biocompatible to not only colon (HT-29) and brain (U87MG) cancer cells, but was also viable towards normal cells (MRC-5). Conclusion Besides being eco-friendly, this mushroom based approach is easily scalable and demonstrates remarkable RGO stability and biocompatibility, even without any form of functionalization.

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Section: Introductionmentioning

confidence: 99%

Exceedingly biocompatible and thin-layered reduced graphene oxide nanosheets using an eco-friendly mushroom extract strategy

Muthoosamy

Bai

Abubakar

et al. 2015

IJN

View full text Add to dashboard Cite

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“…Zhao and co-workers [6] have demonstrated that urea is an effective reducing agent in removing oxygen-containing groups from GO for restoring the conjugated electronic structure of graphene. Other eco-friendly reducing agents, such as L-ascorbic acid and green tea polyphenols, have also proved to be able to reduce GO [7][8][9]. Gallic acid (GA), a natural organic acid with three adjacent hydroxyl groups located at its only benzene ring, has recently been shown to possess a considerable ability to reduce GO [10].…”

Section: Introductionmentioning

confidence: 99%

Lithium-storage Properties of Gallic Acid-Reduced Graphene Oxide and Silicon-Graphene Composites

Zhang

et al. 2016

Electrochimica Acta

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Graphene oxide (GO) was de-oxygenated using gallic acid under mild conditions to prepare reduced graphene oxide (RGO). The resultant RGO showed a lithium-ion storage capacity of 1280 mA h g -1 at a current density of 200 mA g -1 after 350 cycles when used as an anode for lithium ion batteries. The RGO was further used to stabilize silicon (Si) nanoparticles to prepare silicon-graphene composite electrode materials. Experimental results showed that a composite electrode prepared with a mass ratio of Si:GO = 1:2 exhibited the best lithium ion storage performance.

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“…Given that polyphenols from some plants such as green tea were successfully used to reduce GO to graphene nanosheets (87)(88), the current study was initiated to propose a green and facile method for the chemical reduction of GO using AHAA as the reducing and capping agent. In general, to reduce 0.5 g of few layered graphene oxide (FLGO) dispersed in aqueous solution we have used 1 g of AHAA leaves.…”

Section: Introductionmentioning

confidence: 99%

Artemisia herba-alba Asso eco-friendly reduced few-layered graphene oxide nanosheets: structural investigations and physical properties

Khenfouch

Ndimba

Diallo

et al. 2016

Green Chemistry Letters and Reviews

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Nowadays graphene is universally known as a promising material. Hence, the development of ecofriendly synthesis methods for this material is of great importance. This study reports on the biosynthesis of graphene by a green chemistry process using Artemisia herba-alba Asso (AHAA) natural extract. Moreover, this work reports on the physical properties, including surface/ interface and optical and electrical properties of the obtained graphene sheets. UV-VIS, Raman, XPS spectroscopies and TEM microscopy investigations confirmed the reduction, and the conversion of graphene oxide to few-layered reduced graphene oxide as well as the efficiency of this plant extract compared with several natural extracts and chemical agents. Furthermore, it was found that the optical and electrical properties of graphene can be modulated and controlled via this eco-friendly cost-effective process. Hence, AHAA can be an effective chelating agent to produce graphene sheets. ARTICLE HISTORY

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Increasing the antioxidant activity of green tea polyphenols in the presence of iron for the reduction of graphene oxide

Cited by 255 publications

References 48 publications

Exceedingly biocompatible and thin-layered reduced graphene oxide nanosheets using an eco-friendly mushroom extract strategy

Exceedingly biocompatible and thin-layered reduced graphene oxide nanosheets using an eco-friendly mushroom extract strategy

Lithium-storage Properties of Gallic Acid-Reduced Graphene Oxide and Silicon-Graphene Composites

Artemisia herba-alba Asso eco-friendly reduced few-layered graphene oxide nanosheets: structural investigations and physical properties

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