Graphene-Based Materials Immobilized within Chitosan: Applications as Adsorbents for the Removal of Aquatic Pollutants

Graphene and its derivatives, especially graphene oxide (GO), are attracting considerable interest in the fabrication of new adsorbents that have the potential to remove various pollutants that have escaped into the aquatic environment. Herein, the development of GO/chitosan (GO/CS) composites as ad...

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Bibliographic Details
Published in:Materials 2021-06, Vol.14 (13), p.3655
Main Authors: Alves, Daniele C. da Silva, Healy, Bronach, Yu, Tian, Breslin, Carmel B.
Format: Article
Language:English
Subjects:
Addition polymerization
Adsorbents
Adsorption
Aquatic environment
Biopolymers
Chelating agents
Chelation
Chitosan
Composite materials
Cyclodextrins
Efficiency
Graphene
Heavy metals
Hydrogels
Iron oxides
Mechanical properties
Nitrogen
Organic chemistry
Pollutants
Polymer blends
Reagents
Regeneration
Review
Selectivity
Water treatment
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Summary:Graphene and its derivatives, especially graphene oxide (GO), are attracting considerable interest in the fabrication of new adsorbents that have the potential to remove various pollutants that have escaped into the aquatic environment. Herein, the development of GO/chitosan (GO/CS) composites as adsorbent materials is described and reviewed. This combination is interesting as the addition of graphene to chitosan enhances its mechanical properties, while the chitosan hydrogel serves as an immobilization matrix for graphene. Following a brief description of both graphene and chitosan as independent adsorbent materials, the emerging GO/CS composites are introduced. The additional materials that have been added to the GO/CS composites, including magnetic iron oxides, chelating agents, cyclodextrins, additional adsorbents and polymeric blends, are then described and discussed. The performance of these materials in the removal of heavy metal ions, dyes and other organic molecules are discussed followed by the introduction of strategies employed in the regeneration of the GO/CS adsorbents. It is clear that, while some challenges exist, including cost, regeneration and selectivity in the adsorption process, the GO/CS composites are emerging as promising adsorbent materials.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14133655