Adsorption of organic contaminants by graphene nanosheets: A review

Graphene nanosheets (GNS) such as graphenes and graphene oxides (GOs) have been widely investigated as next-generation adsorbents in both water and wastewater treatment processes due to their unique physicochemical properties and their affinity towards different classes of organic contaminants (OCs)...

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Bibliographic Details
Published in:Water research (Oxford) 2017-12, Vol.126, p.385-398
Main Authors: Ersan, Gamze, Apul, Onur G., Perreault, Francois, Karanfil, Tanju
Format: Article
Language:English
Subjects:
Adsorption
Graphene
Graphene oxide
Graphite - chemistry
Hydrophobic and Hydrophilic Interactions
Nanostructures - chemistry
Organic contaminants
Osmolar Concentration
Oxides
Water Pollutants, Chemical - isolation & purification
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Summary:Graphene nanosheets (GNS) such as graphenes and graphene oxides (GOs) have been widely investigated as next-generation adsorbents in both water and wastewater treatment processes due to their unique physicochemical properties and their affinity towards different classes of organic contaminants (OCs). In the last five years, more than 40 articles investigating adsorption of different classes of OCs by graphene and GO were published in peer-reviewed journals. Adsorption mechanisms were controlled by molecular properties of OCs (e.g., aromatic vs aliphatic, molecular size and hydrophobicity), characteristics of adsorbents (e.g., surface area, pore size distribution, and surface functional groups), and background solution properties (e.g., pH, ionic strength, surfactants, NOM, and temperature). This literature survey includes: (i) a summary of adsorption of OCs by GNS, (ii) a comprehensive discussion of the mechanisms and factors controlling the adsorption of OCs by GNS and a comparison of their adsorption behaviors with those of CNT. This literature survey also identifies future research needs and challenges on the adsorption of OCs by GNS. [Display omitted] •40 articles investigating adsorption of OCs by GNSs were comprehensively examined.•Graphene sheet structure is advantageous for reducing NOM competition.•Oxygen content of graphene sheets change the dispersion state.•Background water properties alter the adsorption of OCs by GNSs.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2017.08.010