Journal ArticleDOI
Graphene and graphene oxide as effective adsorbents toward anionic and cationic dyes
G.K. Ramesha,A. Vijaya Kumara,H.B. Muralidhara,Srinivasan Sampath +3 more
- Vol. 361, Iss: 1, pp 270-277
TLDR
Exfoliated graphene oxide and reduced graphene oxide have been used for the adsorption of various charged dyes such as methylene blue, methyl violet, rhodamine B, and orange G from aqueous solutions using UV-Visible spectroscopy and FT-IR spectroscopic techniques.Abstract:
In the present study, exfoliated graphene oxide (EGO) and reduced graphene oxide (rGO) have been used for the adsorption of various charged dyes such as methylene blue, methyl violet, rhodamine B, and orange G from aqueous solutions. EGO consists of single layer of graphite decorated with oxygen containing functional groups such as carboxyl, epoxy, ketone, and hydroxyl groups in its basal and edge planes. Consequently, the large negative charge density available in aqueous solutions helps in the effective adsorption of cationic dyes on EGO while the adsorption is negligible for anionic dyes. On the other hand, rGO that has high surface area does not possess as high a negative charge and is found to be very good adsorbent for anionic dyes. The adsorption process is followed using UV-Visible spectroscopy, while the material before and after adsorption has been characterized using physicochemical and spectroscopic techniques. Various isotherms have been used to fit the data, and kinetic parameters were evaluated. Raman and FT-IR spectroscopic data yield information on the interactions of dyes with the adsorbent.read more
Citations
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Journal ArticleDOI
Environmental applications of graphene-based nanomaterials.
TL;DR: This critical review assesses the recent developments in the use of graphene-based materials as sorbent or photocatalytic materials for environmental decontamination, as building blocks for next generation water treatment and desalination membranes, and as electrode materials for contaminant monitoring or removal.
Journal ArticleDOI
Decontamination of Bisphenol A from Aqueous Solution by Graphene Adsorption
TL;DR: Graphene could be regarded as a promising adsorbent for BPA removal in water treatment because of its unique sp(2)-hybridized single-atom-layer structure.
Journal ArticleDOI
Adsorption of Polycyclic Aromatic Hydrocarbons by Graphene and Graphene Oxide Nanosheets
TL;DR: The adsorption of naphthalene, phenanthrene, and pyrene onto graphene (GNS) and graphene oxide (GO) nanosheets was investigated to probe the potential adsorptive sites and molecular mechanisms.
Journal ArticleDOI
Adsorption of methylene blue from aqueous solution by graphene.
Tonghao Liu,Yanhui Li,Qiuju Du,Jiankun Sun,Yuqin Jiao,Guangming Yang,Zonghua Wang,Yanzhi Xia,Wei Zhang,Kunlin Wang,Hongwei Zhu,Dehai Wu +11 more
TL;DR: The thermodynamic parameters indicated that the adsorption of methylene blue onto graphene was an endothermic and spontaneous process and graphene is a good adsorbent for the adsOrption of MB.
Journal ArticleDOI
A review on heavy metal ions adsorption from water by graphene oxide and its composites
TL;DR: Graphene oxide and its composites have attracted widespread attentions as novel adsorbents for the adsorption of various heavy metal contaminants as mentioned in this paper, because of the unique physicochemical characteristics, they might become an excellent and most potential adsorbent.
References
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Electric Field Effect in Atomically Thin Carbon Films
Kostya S. Novoselov,Andre K. Geim,Sergey V. Morozov,Da Jiang,Y. Zhang,S. V. Dubonos,Irina V. Grigorieva,A. A. Firsov +7 more
TL;DR: Monocrystalline graphitic films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands and they exhibit a strong ambipolar electric field effect.
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The rise of graphene
TL;DR: Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena can now be mimicked and tested in table-top experiments.
Journal ArticleDOI
The chemistry of graphene oxide
TL;DR: This review will be of value to synthetic chemists interested in this emerging field of materials science, as well as those investigating applications of graphene who would find a more thorough treatment of the chemistry of graphene oxide useful in understanding the scope and limitations of current approaches which utilize this material.
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Processable aqueous dispersions of graphene nanosheets
TL;DR: It is reported that chemically converted graphene sheets obtained from graphite can readily form stable aqueous colloids through electrostatic stabilization, making it possible to process graphene materials using low-cost solution processing techniques, opening up enormous opportunities to use this unique carbon nanostructure for many technological applications.
Journal ArticleDOI
Graphene-Based Ultracapacitors
TL;DR: CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here their performance in an ultracapacitor cell is demonstrated, illustrating the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.