Novel and green synthesis of chemically reduced graphene sheets using Phyllanthus emblica (Indian Gooseberry) and its photovoltaic activity

Ansari, Mohd Zaid; Johari, Rahul; Siddiqi, Weqar Ahmad

doi:10.1088/2053-1591/ab0439

Cited by 23 publications

(6 citation statements)

References 52 publications

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“…The chitosan crosslinking can improve the mechanical and chemical properties, providing a magnetic composite, when associated to CoFe 2 O 4 , with greater stability in acid solution, high adsorption capacity and easy to be separated from the liquid after the adsorption operation [17]. Homayonfard et al [18] reported the effectiveness of Co and Ni ferrites/chitosan composites for cadmium removal from aqueous media, Ansari et al [19] also confirmed the effectiveness of the Cobalt ferrite chitosan composite (Cs-CoFe 2 O 4 ) towards the effective removal of acid dye, while Roknid et al [20] successfully used the magnetic graphene composite for anionic dye remediation.…”

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confidence: 99%

Chitosan supported CoFe2O4 for the removal of anthraquinone dyes: kinetics, equilibrium and thermodynamics studies

et al. 2020

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Chitosan supported cobalt ferrite nanocomposite (Cs-CoFe 2 O 4 ) was synthesized and characterized. The synthesized Cs-CoFe 2 O 4 was used for the removal of Anthraquinone dyes (Methylene Green, MG and Reactive blue 4, RB4) from aqueous solution in batch processes. Kinetics data were subjected to pseudo-first-order and pseudo-second-order, Elovich and intra-particle diffusion models, while the equilibrium data were evaluated with Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models. The results of characterizations revealed that CoFe 2 O 4 was successfully incorporated into the Cs, with resulting composite retaining its magnetic properties and the functional group in the Cs. Considering the closeness Q e(exp ) and Q e(cal .), also the values of R 2 and %SSE, the MG adsorption followed pseudosecond-order with average rate constants of 8.3 × 10 −3 min −1 while the adsorption kinetic of RB4 is best described by pseudo-first-order model with average rate constant of 2.91 × 10 −2 min −1 . Langmuir adsorption isotherm fits gave R 2 > 0.9 for both dyes with maximum adsorption capacities of 63.34 and 35.05 mg/g obtained MG and RB4 respectively. The thermodynamic parameters showed revealed spontaneous adsorption processes. The results indicated that the prepared Cs-CoFe 2 O 4 is an efficient recyclable adsorbent for the MG and RB4 dye without losing the original activity and stability for water treatment applications.

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confidence: 99%

Chitosan supported CoFe2O4 for the removal of anthraquinone dyes: kinetics, equilibrium and thermodynamics studies

et al. 2020

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“…UV‐visible spectral analysis of GO suspension showed a maximum absorption peak (λ max ) at 251 nm attributed to π‐π * transitions of the aromatic C=C bond [ 32 ]. The transformation of yellow‐brown GO suspension into black colloidal solution indicated successful deoxygenation of the GO suspension under the bioreduction process to form TrGO (Figure 1 ).…”

Section: Resultsmentioning

confidence: 99%

Biosynthesis of reduced graphene oxide using Turbinaria ornata and its cytotoxic effect on MCF‐7 cells

Smita

Abraham

Kumar

et al. 2021

IET Nanobiotechnology

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Graphene-based nanomaterials are gaining importance in biomedicine because of their large surface areas, solubility, and biocompatibility. Green synthesis is the most economical method for application, as it is rapid and sustainable. Biofunctionalized reduced graphene oxide (TrGO) nanosheets were synthesized using methanol extract of Turbinaria ornata, and bioreduction of graphene oxide was primarily confirmed and characterized using UV-visible, Fourier transform infrared (FTIR), and X-ray diffraction spectroscopy and further characterized by zeta potential and transmission electron microscopy. The FTIR spectra of TrGO showed a decrease in the band intensities of oxygen groups, thus confirming effective deoxygenation. The zeta potential value of −34.6 mV revealed that synthesized TrGO was highly stable. The cytotoxic effect of TrGO against MCF-10A and MCF-7 cells was ascertained using MTT assay, showed a greater cytotoxic effect on MCF-7 cells. The IC 50 of TrGO treatment against MCF-7 was calculated to be 31.25 µg, which is onefold lower than the cytotoxic effect of methanolic extract of T. ornata (60.0 ± 1.14 µg/ml). In addition, there was a statistically significant difference in cell viability between MCF-10A and MCF-7 cells in the treatment of TrGO. Hence, this study results in an efficient green reductant for producing rGO nanosheets that possess cytotoxicity against breast cancer cells.SnO/Sn, or ZnO/Zn-functionalized GNs) were found to be This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…Mallikarjuna and co-authors used Coleus amboinicus (a semi-succulent perennial herbaceous plant with different nutritional and therapeutic properties belonging to the Lamiaceae family) extract as a bio-reducing agent to convert graphite-derived GO to RGO [63]. Various other green-reducing agents are also used to convert (graphitederived) GO to RGO (or graphene), such as green tea extract [64], Zante currants (one of the oldest known resins) [65], Phyllanthus Emblica (Indian Gooseberry) extract [66], Citrullus colocynthis leaf extract [67], Syzgium cumini (Jambul or black plum) seed [68], Tridax procumbens (a species of flowering plant in the daisy family) leaf extract [69], Urtica Dioica (a herbaceous perennial flowering plant) extracts [70], Opuntia ficus-indica (a species of cactus) extract [71], Glucose [72], Punica granatum (pomegranate) juice [73], Shikimic acid (an organic compound existing naturally in assorted plants) [74] among others. In most of the above cases, GO and the non-toxic reducing agents are stirred or sonicated to produce RGO or graphene.…”

Section: Green-chemical Reduction Of Graphene Oxidementioning

confidence: 99%

Green syntheses of graphene and its applications in internet of things (IoT)—a status review

Banerjee¹

2022

Nanotechnology

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Internet of Things (IoT) is a trending technological field that converts any physical object into a communicable smarter one by converging the physical world with the digital world. This innovative technology connects the device to the internet and provides a platform to collect real-time data, cloud storage, and analyze the collected data to trigger smart actions from a remote location via remote notifications etc. Because of its wide-ranging applications, this technology can be integrated into almost all the industries. Another trending field with tremendous opportunities is Nanotechnology, which provides many benefits in several areas of life, and helps to improve many technological and industrial sectors. So, integration of IoT and Nanotechnology can bring about the very important field of Internet of Nanothings (IoNT), which can re-shape the communication industry. For that, data (collected from trillions of nanosensors, connected to billions of devices) would be the ‘ultimate truth’, which could be generated from highly efficient nanosensors, fabricated from various novel nanomaterials, one of which is graphene, the so-called ‘wonder material’ of the 21st century. Therefore, graphene-assisted IoT/IoNT platforms may revolutionize the communication technologies around the globe. In this article, a status review of the smart applications of graphene in the IoT sector is presented. Firstly, various green synthesis of graphene for sustainable development is elucidated, followed by its applications in various nanosensors, detectors, actuators, and memory and nano-communication devices. Also, the future market prospects are discussed to converge various emerging concepts like machine learning, fog/edge computing, artificial intelligence, big data, blockchain, with the graphene-assisted IoT field to bring about the concept of ‘all-round connectivity in every sphere possible.

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Novel and green synthesis of chemically reduced graphene sheets using Phyllanthus emblica (Indian Gooseberry) and its photovoltaic activity

Cited by 23 publications

References 52 publications

Chitosan supported CoFe2O4 for the removal of anthraquinone dyes: kinetics, equilibrium and thermodynamics studies

Chitosan supported CoFe2O4 for the removal of anthraquinone dyes: kinetics, equilibrium and thermodynamics studies

Biosynthesis of reduced graphene oxide using Turbinaria ornata and its cytotoxic effect on MCF‐7 cells

Green syntheses of graphene and its applications in internet of things (IoT)—a status review

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